Updated on 2022/12/01

写真a

 
TERANISHI Masaki
 
Organization
Academic Assembly Institute of Science and Technology SEISAN DESIGN KOUGAKU KEIRETU Assistant Professor
Graduate School of Science and Technology Environmental Science and Technology Assistant Professor
Faculty of Engineering Department of Engineering Assistant Professor
Title
Assistant Professor
External link

Degree

  • 博士(工学) ( 2015.3 )

  • 修士(工学) ( 2012.3 )

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering

Research History (researchmap)

  • Niigata University   Assistant Professor

    2022.4

      More details

  • Niigata University   Institute for Research Promotion Center for Transdisciplinary Research   Assistant Professor

    2020.3 - 2022.3

      More details

  • University of Fukui   Faculty of Engineering   Assistant Professor

    2017.1 - 2019.2

      More details

Research History

  • Niigata University   Institute of Science and Technology, Academic Assembly   Assistant Professor

    2022.4

  • Niigata University   Faculty of Engineering   Assistant Professor

    2022.4

  • Niigata University   Environmental Science and Technology, Graduate School of Science and Technology   Assistant Professor

    2022.4

  • Niigata University   Institute for Research Promotion Center for Transdisciplinary Research   Assistant Professor

    2020.3 - 2022.3

 

Papers

  • Efficient stress integration algorithm of memory surface model with shrinking rule under plane stress field Reviewed

    Masaki Teranishi, Kensaku Kaneko, Hiroshi Hirata, Noritake Hiyoshi

    Engineering Structures   275   115324 - 115324   2023.1

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.engstruct.2022.115324

    researchmap

  • Evaluation of elastic stiffness in bolted timber joints for applying turn-of-nut method Reviewed

    Doppo Matsubara, Masaki Teranishi

    Journal of Wood Science   68 ( 1 )   2022.12

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    The mechanical performance of bolt joints in wooden structures is known to vary significantly with the initial tightening force (axial force) of the bolts during the construction work. When a joining method that considers axial force is applied to a structure, the control of the axial force is important. This study attempts to evaluate the elastic stiffness of bolted timber joints during tightening for the purpose of applying the turn-of-nut tightening method, one of the methods for controlling axial force. Considering the elastic stiffness of joints during tightening as a series spring model using the spring constant of the bolt and the embedment spring constant of the washer, elastic stiffness is calculated using the washer embedment spring constant obtained through a washer embedment test. This result is compared with the elastic stiffness obtained through the tightening test using four species of timber. It was found that while the washer embedment spring constant varies greatly with timber species, the calculated values agreed well with the test results.

    DOI: 10.1186/s10086-022-02038-1

    researchmap

    Other Link: https://link.springer.com/article/10.1186/s10086-022-02038-1/fulltext.html

  • Elastic interaction in multiple bolted timber joints Reviewed

    Doppo Matsubara, Masaki Teranishi, Yoshiaki Wakashima

    Journal of Wood Science   68 ( 1 )   2022.12

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    The management of axial forces is an important issue when a joining method that takes into account the axial forces generated by tightening bolts is applied to the bolted joints of a wooden structure during construction. This study focuses on elastic interactions in which the axial force of adjacent bolts changes as a result of sequential tightening of each bolt in multiple bolted joints affecting the deformation around each of the other bolts. To this end, tightening experiments are conducted within the elastic range, with the tightening sequence, bolt spacing, and wood thickness set as parameters. From the results, it was found that variations in axial force tended to decrease as bolt spacing increases. In addition, an evaluation formula for calculating fluctuations in axial force due to elastic interactions was derived. By comparing the calculated value to the experimental value, it was found that as bolt spacing was increased, the calculated value tended to capture the experimental values well.

    DOI: 10.1186/s10086-022-02060-3

    researchmap

    Other Link: https://link.springer.com/article/10.1186/s10086-022-02060-3/fulltext.html

  • Video extensometer for structural steel using silhouette image from telecentric illumination system Reviewed

    Masaki Teranishi

    Optical Engineering   61 ( 10 )   2022.10

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:SPIE-Intl Soc Optical Eng  

    DOI: 10.1117/1.oe.61.10.105107

    researchmap

  • Axial Force Fluctuations in Pre-stressed Wooden Connections Evaluated from Stress Relaxation and Accelerated Deterioration Tests Reviewed

    77 ( 10 )   384 - 389   2022.10

     More details

  • Finite element analysis of the bi-valve shell based on solid and shell elements

    Minori Ogoshi, Masaki Teranishi, Doppo Matsubara

    Proceedings of the IASS Annual Symposium 2022   3229 - 3238   2022.9

     More details

  • Pretension loss in bolted timber joint under external tensile load Reviewed

    Masaki Teranishi, Doppo Matsubara

    European Journal of Wood and Wood Products   80 ( 4 )   817 - 827   2022.8

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s00107-022-01827-1

    researchmap

    Other Link: https://link.springer.com/article/10.1007/s00107-022-01827-1/fulltext.html

  • X線CT画像を用いた二枚貝の幾何学的・力学的解析手法の提案 Reviewed

    生越 季理,寺西 正輝,松原 独歩,石川 浩一郎

    日本建築学会構造系論文集   87 ( 795 )   445 - 453   2022.5

     More details

  • Neural network constitutive model for uniaxial cyclic plasticity based on return mapping algorithm Reviewed

    Masaki Teranishi

    Mechanics Research Communications   119   103815 - 103815   2022.1

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.mechrescom.2021.103815

    researchmap

  • Nonlinear finite-element analysis of embedment behavior of metal washer in bolted timber joints Reviewed

    Masaki Teranishi, Doppo Matsubara, Yoshiaki Wakashima, Hidemaru Shimizu, Akihisa Kitamori

    Journal of Wood Science   67 ( 1 )   2021.12

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    <title>Abstract</title>The pretensioning force in bolted joints enhances the lateral strength of the connections, and causes the embedment of metal washers into wood. Despite the significance of embedment behavior in the design of bolted joints, its mechanism has yet to be fully understood. In this study, the mechanism of the embedment of a metal washer into wood along the radial direction was examined through three-dimensional nonlinear finite-element analysis (FEA). The FEA results were validated by comparing them with experimental results for nine metal washers with different geometries. Moreover, the sensitivity of embedment stiffness and yield load to wooden material constants was also investigated. The numerical results showed good qualitative and quantitative agreement with the experimental results. In addition, the embedment stiffness and yield load were sensitive to the yield stress and Young’s modulus of wood in the radial and tangential directions. The determination of these mechanical properties of wood through material testing is important for reproducing the behavior of the embedment of a metal washer into wood and accurately estimating the yield load and initial stiffness using FEA. This will play a significant role in designing bolted joints.

    DOI: 10.1186/s10086-021-01973-9

    researchmap

    Other Link: https://link.springer.com/article/10.1186/s10086-021-01973-9/fulltext.html

  • Constitutive model with memory-surface shrinking rule for cyclic plasticity of structural steel Reviewed

    Masaki Teranishi, Kensaku Kaneko, Hiroshi Hirata, Noritake Hiyoshi

    Journal of Constructional Steel Research   187   106923 - 106923   2021.12

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jcsr.2021.106923

    researchmap

  • アルミニウム鋳造合金の疲労亀裂発生に関するCT観察と有限要素解析 Reviewed

    桑水流 理, 寺西 正輝, 小林 正和, 戸田 裕之

    SPring-8/SACLA利用研究成果集   9 ( 6 )   383 - 390   2021.10

     More details

  • Grid patterns optimization for single-layer latticed domes Reviewed

    Masaki Teranishi, Koichiro Ishikawa

    Advances in Structural Engineering   24 ( 2 )   359 - 369   2021.1

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:SAGE Publications  

    In previous studies on optimized single-layer latticed domes, the inner space and external shape of the optimized dome is different from those of the initial dome. This difference may result in loss of structural functionality and aesthetics intended by the designers, making it difficult to separately evaluate the mechanical properties of the grid patterns and shape of the surface. In this study, 64 types of single-layer latticed domes having different geometric properties are optimized to obtain mechanically effective grid patterns. Six types of objective functions are employed. The nodal coordinates of the domes serve as the design variables under geometrical constraints, where the nodes of the domes can be shifted on the surface area. The geometric and mechanical properties of the optimized grid patterns are evaluated quantitatively against the objective functions. Moreover, interactions between the geometric and mechanical properties are investigated. The results show that the optimized grid pattern has superior mechanical properties and geometric imperfection sensitivity. This optimization scheme can be applied for designing mechanically effective grid patterns for single-layer latticed domes.

    DOI: 10.1177/1369433220956813

    researchmap

    Other Link: http://journals.sagepub.com/doi/full-xml/10.1177/1369433220956813

  • A STRESS CALCULATION METHOD FOR CONSTITIVE MODEL BASED ON RETURN MAPPING ALGORITHM EMBEDDING NEURAL NETWORK Reviewed

    M. Teranishi

    Transactions of the Architectural Institute of Japan   85 ( 778 )   2020.12

     More details

    Authorship:Lead author  

    researchmap

  • APPLICATION OF NONHARDENING REGION MODEL TO STEEL BEAMS UNDER CYCLIC LOADING Reviewed

    H. Hirata, M. Teranishi, K. Kaneko

    2020.11

     More details

  • 非比例負荷における硬化挙動を考慮した材料構成則 Reviewed

    Masaki TERANISHI

    steel construction engineering   27 ( 107 )   33 - 40   2020.9

     More details

    Authorship:Lead author  

    researchmap

  • Mathematical modelling of bi‐valve shell Reviewed

    M. Teranishi, M. Ogoshi, K. Ishikawa, D. Matsubara

    Proceedings of Symmetry: Art and Science, 2019 – 11th Congress and Exhibition of SIS   2019.11

     More details

    Authorship:Lead author   Language:English  

    researchmap

  • Optimization of grid patterns for single-layer latticed domes

    M. Teranishi, S. An, K. Ishikawa

    Proceedings of the IASS Annual Symposium 2019   2026 - 2033   2019.10

     More details

    Authorship:Lead author   Language:English  

    researchmap

  • Stress evaluation of real shape of bi-valve shell by image-based finite element analysis

    M. Ogoshi, M.Teranishi, K. Ishikawa, D. Matsubara

    Proceedings of the IASS Annual Symposium 2019   1622 - 1629   2019.10

     More details

    Language:English  

    researchmap

  • Statistical evaluation of fracture of inclusions in cast aluminum alloy by massively-parallel voxel finite element analysis and geometrical measurements Reviewed

    TERANISHI Masaki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    Transactions of the JSME   84 ( 863 )   18-00028 - 18-00028   2018.7

     More details

    Authorship:Lead author   Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Fatigue crack in cast aluminum alloys subject to low-cycle fatigue is initiated mainly by the fracture of Si particles. To investigate the mechanism of Si particle fracture, we carried out the geometrical measurements and finite element analysis for a lot of Si particles in their actual geometrical configuration. The synchrotron X-ray CT was used for the geometrical measurement and the image-based finite element modeling. The fracture of Si particles were detected as a source of crack initiation from the CT images captured during the fatigue test. The large-scale voxel finite element model contains the outer surface, pores, Si and intermetallics. The number of elements was about 150 million. Two cycles of loading were calculated. The finite element analysis and its post-processing were performed on the supercomputers by the massively-parallel computing. The result of finite element analysis showed that the first principal stress was concentrated around the aligned or gathered Si particles, and the gradual increase by cyclic loading in the stress of the Si particles appeared near the outer surface and pores. Moreover, the result of geometrical measurements showed that the volume, shape index and adjacency index of each Si particle could be used to evaluate the likelihood of particle fracture. The probability of particle fracture was statistically evaluated with respect to those geometrical and mechanical parameters. The relationship between mechanical and geometrical parameters were also examined. As the result, the criteria of fractured Si particle was proposed by using the combination of geometrical and mechanical parameters.

    DOI: 10.1299/transjsme.18-00028

    CiNii Article

    researchmap

  • 多軸応力状態に対する完全弾塑性体から成るサブレイヤーモデルの区分巨的評価手法の提案 Reviewed

    寺西正輝, 元結正次郎

    日本建築学会構造工学論文集   63B   1 - 6   2017.4

     More details

    Authorship:Lead author   Language:Japanese  

    researchmap

  • Three-dimensional stress and strain around real shape Si particles in cast aluminum alloy under cyclic loading Reviewed

    Masaki Teranishi, Osamu Kuwazuru, Shota Gennai, Masakazu Kobayashi, Hiroyuki Toda

    Materials Science and Engineering: A   678   273 - 285   2016.12

     More details

    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.msea.2016.10.004

    Web of Science

    researchmap

  • 一軸応力状態における非硬化領域の概念を有する修正サブレイヤーモデルの提案 Reviewed

    寺西正輝, 元結正次郎

    日本建築学会構造系論文集   80 ( 709 )   401 - 409   2015

     More details

    Authorship:Lead author   Language:Japanese  

    researchmap

  • 硬化則を有するサブレイヤーモデルの一軸応力状態における巨視的評価手法 一軸応力状態における非硬化領域の概念を有する修正サブレイヤーモデルの提案 Reviewed

    寺西正輝, 元結正次郎

    日本建築学会構造工学論文集   60B   219 - 224   2014

     More details

    Authorship:Lead author   Language:Japanese  

    researchmap

  • A modified overlay model under the uni-axial cyclic loading Reviewed

    M. Teranishi, S. Motoyui

    COMPSAFE2014   460 - 463   2014

     More details

    Authorship:Lead author   Language:English  

    researchmap

  • 金属系材料の応力ひずみ関係に対するサブレイヤーモデルの巨視的評価手法 その2完全弾塑性体から成るサブレイヤーモデルの多軸応力状態における巨視的評価手法 Reviewed

    元結正次郎, 寺西正輝

    日本建築学会構造系論文集   79 ( 695 )   67 - 74   2014

     More details

    Language:Japanese  

    researchmap

▶ display all

MISC

  • A cyclic softening and hardening rule for structural steel under variable amplitude loading

    平田寛, 寺西正輝, 金子健作

    日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)   2021   2021

  • Image-based finite element analysis of Fulvia mutica under selfweight.

    生越季理, 寺西正輝, 松原独歩, 石川浩一郎

    日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)   2021   2021

  • 20108 ニューラルネットワークを用いた多軸応力下での材料構成則の応力計算 その2 数値解析例

    平田 寛, 寺西 正輝

    構造I   ( 2020 )   215 - 216   2020.9

     More details

    Language:Japanese   Publisher:日本建築学会  

    CiNii Article

    researchmap

  • 20333 CT画像を用いた二枚貝の厚みの自動計測手法の提案

    生越 季理, 寺西 正輝, 松原 独歩, 石川 浩一郎

    構造I   ( 2020 )   673 - 676   2020.9

     More details

    Language:Japanese   Publisher:日本建築学会  

    CiNii Article

    researchmap

  • 20107 ニューラルネットワークを用いた多軸応力下での材料構成則の応力計算 その1 応力計算手順の概要

    寺西 正輝, 平田 寛

    構造I   ( 2020 )   213 - 214   2020.9

     More details

    Language:Japanese   Publisher:日本建築学会  

    CiNii Article

    researchmap

  • 20452 単層ラチスドームの格子形状の最適化

    Sok An, 寺西 正輝, 石川 浩一郎

    構造I   ( 2019 )   903 - 904   2019.7

     More details

    Language:Japanese   Publisher:日本建築学会  

    CiNii Article

    researchmap

  • 20461 イメージベース有限要素解析による貝殻の応力解析

    生越 季理, 寺西 正輝, 石川 浩一郎, 松原 独歩

    構造I   ( 2019 )   921 - 922   2019.7

     More details

    Language:Japanese   Publisher:日本建築学会  

    CiNii Article

    researchmap

  • High precision evaluation of stress field around crack initiation site in cast aluminum alloy by zooming finite element analysis

    TERANISHI Masaki, SAKURAI Miwako, Kuwazuru Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2019   OS1602   2019

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Crack initiation in cast aluminum alloy under low-cycle fatigue loading is mainly caused by the fracture of Si particles. The fracture of Si particles is influenced by pores, aluminum particle, specimen surface and their interactions. Thus, the stress-strain field on the large part of specimens should be investigated to elucidate the fracture mechanics of Si particle. In our previous study, the large-scale image-based finite element analysis was conducted by using CT images for the large part of a specimen, where the voxel element was employed to generate the finite element mesh definitely and automatically. However, the voxel element caused the lack of accuracy of the stress along the material interface. In this study, we addressed the zooming analysis by using the result of large-scale finite element analysis to achieve the high precision of stress field. The small volume image for zooming analysis was cropped from the entire CT images, where the Si particle for the crack initiation was contained. By using the extracted CT images, the finite element model with ten-node tetrahedral element was generated. The nodal displacement on the surface of the zooming small model was imposed from the result of the finite element analysis. The comparison between the large-scale, zooming small and local small model was performed to investigate the validation of the zooming analysis. As the result, the zooming analysis could reproduce the mechanical effect on the fracture Si particle observed in the large-scale analysis and mitigate the lack of accuracy of the stress due to the voxel element.

    DOI: 10.1299/jsmemm.2019.os1602

    CiNii Article

    researchmap

  • Stress evaluation around inclusions in cast aluminum alloy by massively-parallel voxel finite element analysis

    TERANISHI Masaki, Kuwazuru Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2019   OS1601   2019

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Crack initiation in cast aluminum alloy under low-cycle fatigue loading is mainly caused by the fracture of Si particles. In this study, the large-scale image-based finite element analysis was conducted to reveal the mechanism of Si particle fracture. The fatigue test and in situ CT scanning were performed at SPring-8. The fracture of Si particle was identified by chronological CT observation. The CT images used for the model was extracted into quarter of horizontal cross section where the fractured Si particle for crack initiation was included. The image-based finite element model with voxel element was generated semi-automatically using the extracted CT images. The number of elements for the finite element model was about 130 million. To evaluate the incremental rate of stress for Si particles under cyclic loadings, 10 cycles of loading were applied in the analysis. The large-scale finite element analysis and its post-processing were performed on the supercomputers by the massively-parallel computing. The result of the finite element analysis showed that the value of the first principal stress for Si particles and its incremental rate under cyclic loadings did not only depend on their shapes but also their position in the specimen. Moreover, it was observed that the increment of the first principal stress for the fractured Si particle near a pore under cyclic loadings was drastically changed.

    DOI: 10.1299/jsmemm.2019.os1601

    CiNii Article

    researchmap

  • 20466 Formex代数を用いたDiamaticドームの幾何的最適化

    チャット トラー, 寺西 正輝, 石川 浩一郎

    構造I   ( 2018 )   931 - 932   2018.7

     More details

    Language:Japanese   Publisher:日本建築学会  

    CiNii Article

    researchmap

  • Large Scale Fatigue Simulation of Cast Aluminum Alloy

    SAKURAI Miwako, TERANISHI Masaki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2018   PS19   2018

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    We have addressed the mechanism of fatigue crack initiation in cast aluminum alloys. To numerically simulate the actual mechanical condition around the crack initiation site, the finite element model has to include a lot of inclusions along with micro and macro pores and material surface. We are trying to realize this kind of large-scale image-based finite element analysis by using the synchrotron CT and voxel finite element techniques. The finite element model of AC4CH-T6 cast aluminum alloy was constructed and its fatigue simulation of ten cycles loading was carried out. From the comparison of the experiment and the simulation, we found that the silicon particle in the crack initiation site underwent a high stress concentration and a low geometrical constraint leading to a gradual increase in the stress.

    DOI: 10.1299/jsmemm.2018.ps19

    CiNii Article

    researchmap

  • Stress evaluation around inclusion in the crack initiation site by massively-parallel finite element method with heterogeneous voxel element

    TERANISHI Masaki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2018   OS1102   2018

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Fatigue crack in cast aluminum alloys subjected to low-cycle fatigue is initiated mainly by the fracture of Si particles. We addressed the mechanism of Si particle fracture through fatigue testing and <i>in situ</i> CT scanning, and the large scale image-based finite element analysis. The fracture of Si particle in the crack initiation site was detected from chronological CT observation. The large scale finite element analysis, where the number of element was about 150 million, was conducted by using CT images which was extracted to contain crack initiation site. To generate the finite element mesh automatically, the heterogeneous voxel element was employed. Moreover, the small scale analysis with 10-node tetrahedral element was performed to compare the results of large scale analysis. The large scale finite element analysis and its post-processing were performed on the supercomputers by the massively-parallel computing. The result of finite element analysis showed that the first principal stress of the interested Si particle was higher inside the specimen than in the surface of the specimen since the geometrical constraint was generated from the normal strain to the loading axis. Moreover, the first principal stress of the interested Si particle increased in neighbor of the surface of specimen under cyclic loading while the stress of Si particles inside the specimen and at the corner of specimen decreased.

    DOI: 10.1299/jsmemm.2018.os1102

    CiNii Article

    researchmap

  • Applicability of voxel element considering heterogeneity of material for integration points of finite element

    TERANISHI Masaki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2018   OS1101   2018

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Image-based modeling technique enables us to create the finite element model with real shape by using CT images. Moreover, the large-scale finite element model with billions of voxel elements can be meshed semi-automatically while the meshing of tetrahedral element in large-scale FEA is considerably difficult. However, interface between dissimilar materials of voxel element has the stepwise shape, where the incorrect stress concentration is generated. To overcome the shortcoming of the voxel element, we proposed the voxel element the material properties of which are defined in each integration point of the voxel element. Material properties of each integration point are determined based on the bi-linear interpolation of the intensity of CT images. Image-based finite element analysis was performed by using CT images of the cast aluminum alloy containing Si particle, intermetallic compounds, aluminum matrix and pore, where the interface of them is complex curved surface. Results among the 10-node tetrahedral element, the homogeneous voxel element and the heterogeneous voxel element were compared to verify the effectiveness of the proposed method. As the result, it was found that the integration point stress of the proposed model vibrated more violently than that of homogeneous voxel model in the stress concentration region of dissimilar interface, however the average element stress of both model was almost same there. Moreover, the average stress of the proposed model is similar distribution of that of 10-node tetrahedral model in the low stress region of particle/matrix interface.

    DOI: 10.1299/jsmemm.2018.os1101

    CiNii Article

    researchmap

  • Evaluation of Cyclic Elastic-Plastic Stress around Many Inclusions in Cast Aluminum Alloy by Massively- Parallel Finite Element Analysis

    TERANISHI Masaki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2017   OS0908   2017

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Fatigue crack is initiated by the fracture of Si particles or debonding of Al-Si interface in low-cycle of cast aluminum alloys. To fully utilize the synchrotron X-ray CT image and evaluate the precise stress and strain in the microstructure under a cyclic loading, a large-scale finite element model was constructed based on the CT image. The outer surface, pores, Si particles and intermetallics were fully considered in this model. The voxel finite element was employed for simulation with stabilization. The number of finite elements was about 150 million. The analysis and post-processing were performed on the supercomputer by the massively-parallel computing with the domain decomposition techniques. The material and geometrical nonlinearities were considered, and the two cycle of loading was calculated. The result showed that the effect of free surface was predominant on the accumulation of plastic strain in matrix phase and the gradual increase of stress in silicon phase. The availability of massively-parallel computing to the large-scale micromechanical analysis was demonstrated. Moreover, the geometrical analyses of silicon particles were performed, then the correlation between mechanical and geometrical parameters were investigated statistically, where we found that the high stress concentration was occurred on silicon particles with complex shape and ones at the near of which other particle was present.

    DOI: 10.1299/jsmemm.2017.os0908

    CiNii Article

    researchmap

  • Particle Fracture Life Evaluation of Aggregate Inclusions in Cast Aluminum Alloy Based on Its Geometrical Information

    MIYASHITA Naoki, UCHIDA Masataka, TERANISHI Masaki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2017   OS0905   2017

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    In cast aluminum alloys, it is found from an experiment that a fatigue crack is initiated from the fracture of Si particles. We have been investigating a methodology to evaluate the particle fracture life from the geometrical parameters of Si particles. By using the synchrotron radiation CT, the geometrical parameters of Si particles were measured, and the image-based finite element analyses were also performed to evaluate the mechanical parameters of Si particles. A few effective geometrical and mechanical parameters were selected to determine the fracture of Si particles. The particle fracture life of Si particle was determined from the chronological observation of CT images. Then, the relationship between the particle fracture life and the geometrical and mechanical parameters were learned by the artificial neural network to predict the particle fracture life of unknown Si particles. In practice, forty three Si particles including the fractured and nonfractured particles were selected from five fatigue specimens, and used for the finite element analysis to evaluate the mechanical parameters. Their geometrical and mechanical parameters were used as the training data for the neural network. The validity of the predicted particle fracture life was examined through the comparison with the actual parameters of fractured particles.

    DOI: 10.1299/jsmemm.2017.os0905

    CiNii Article

    researchmap

  • Effect of Uncertain Stress Amplitude on Elastic-Plastic Stress around Many Inclusions in Cast Aluminum Alloy

    UCHIDA Masataka, MIYASHITA Naoki, TERANISHI Masaki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2017   OS0907   2017

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    The fatigue crack initiation mechanism of cast aluminum alloy has been addressed by using the synchrotron radiation which gives a high resolution CT images to visualize the microstructure. By the 4D imaging, we have observed the crack initiation and propagation by low-cycle fatigue where the source of crack was the fracture of Si particle or debonding of Al-Si interface. The micromechanical finite element analysis can be performed with the precise microstructure based on the CT images. To investigate the effect of a small uncertainty in the applied cyclic loading on the stress and strain around the silicon particles which were fractured and initiated a crack in the fatigue test, the elastic-plastic finite element analyses was carried out with ten cycles of loading. The fractured silicon particles were identified from chronological CT observation. A method to make a reasonable waveform with precise mean and standard deviation was proposed. The small uncertainty coming from the experimental error was considered, and two types of cyclic loading waveform was made and used in the simulation. From those results, we found that the small uncertainty of applied stress had an significant effect on the maximum stress in silicon particles and increased it gradually by the cyclic loading.

    DOI: 10.1299/jsmemm.2017.os0907

    CiNii Article

    researchmap

  • Fatigue Damage Evaluation of Cast Aluminum Alloy by Using Finite Element Analysis Based on Synchrotron Radiation Microtomography

    TERANISHI Masaki, UCHIDA Masataka, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of Mechanical Engineering Congress, Japan   2017   G0300404   2017

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Cast aluminum alloys are promising from the perspective of its high specific strength and high cost effectiveness. However, cast aluminum alloys inevitably contain casting defects which degrade its fatigue strength, and it leads to the low reliability. It was observed in the experiments that the cracking was initiated by the fracture of Si particles or debonding of Al-Si interface. In this study, the image-based finite element analyses were carried out by using synchrotron X-ray CT images to elucidate the crack initiation mechanism of cast aluminum alloy under low-cycle fatigue. To examine the difference of mechanisms between fracture of Si particle and debonding of Al-Si interface, the finite element elastic-plastic analyses of five models for the fractured or debonded particles were performed under ten cycles of fatigue loading. From the numerical results, the Si particle with large volume was fractured because of high stress concentration, while the Si particle neighboring closely to intermitallics was debonded since the large plastic deformation of the aluminum matrix between Si and IMC particles.

    DOI: 10.1299/jsmemecj.2017.g0300404

    CiNii Article

    researchmap

  • Geometrical Evaluation of Inclusions in Cast Aluminum Alloy by Using Synchrotron Radiation Microtomography and Its Contribution to Fatigue Crack Initiation

    TERANISHI Masaki, MIYASHITA Naoki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of Mechanical Engineering Congress, Japan   2017   G0300405   2017

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Cast aluminum alloys have been widely used in transportation equipment because of its high productivity and high specific strength. However, the cast aluminum alloys have low reliability of fatigue strength caused from inevitable casting defect. In our previous work, from the low cycle fatigue test and in situ synchrotron X-ray CT observation of the cast aluminum alloy, it was found that the crack initiation of the cast aluminum alloy was occurred by the fracture of Si particles. In this study, the fracture of Si particle was regarded as the crack initiation, and the geometrical characteristic of fractured Si particle was investigated. The fractured and intact Si particles were identified by chronological CT observation. Geometrical analyses of Si particles were conducted by using high resolution CT images, while Si particles were extracted by an appropriate threshold value of brightness. Geometrical parameters of a few hundreds of thousand Si particles in a specimen were analyzed, then they were evaluated statistically. The effective geometrical parameters were suggested to determine the condition of particle fracture.

    DOI: 10.1299/jsmemecj.2017.g0300405

    CiNii Article

    researchmap

  • Damage Evaluation of Inclusions in Cast Aluminum Alloy by using Image-based Finite Element Analysis

    TERANISHI Masaki, GENNAI Shota, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2016   OS15-11   2016

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    To understand the crack nucleation mechanism, the image-based finite element analysis was employed. The crack propagation mechanism have been studied, while the crack initiation mechanism is not revealed. Through the fatigue test and <i>in situ</i> CT observation, we have observed that the fatigue crack was nucleated from the breakage of Si particles and, the broken and intact Si particles were identified. By using the image-based modeling technique, the finite element models were generated so as to include the interested Si particle in the analysis domain. A few hundreds of Si particles and intermetallic compounds were contained in the finite element models. We examined the cause of crack initiation with the breakage of Si particles and the effect of intermetallic compounds against Si particles through numerical results.

    DOI: 10.1299/jsmemm.2016.os15-11

    CiNii Article

    researchmap

  • Statistical Evaluation for Effect of Geometrical Properties of Inclusions on Its Fatigue Damage in Cast Aluminum Alloy

    GENNAI Shota, TERANISHI Masaki, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2016   OS15-10   2016

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    Fatigue test and <i>in situ</i> observation were performed using a cast aluminum alloy AC4CH-T6, the fatigue cracking behavior was observed. Then the geometry and distribution of inclusions in the cast aluminum alloy is measured by using the CT images. The relationship between the geometrical parameters of the particles and the particle fracture life is evaluated and learned by the artificial neural network. Using the trained artificial neural network, the particle fracture life of particles in other CT image was predicted.

    DOI: 10.1299/jsmemm.2016.os15-10

    CiNii Article

    researchmap

  • 20152 Formulation of the Macroscopic Evaluation Method, Macroscopic Evaluation : Method of the Modified Sub-layer Model for the Uni-axial Stress Field Part1

    TERANISHI Masaki, MOTOYUI Shojiro

    Summaries of technical papers of annual meeting   2015 ( 2015 )   303 - 304   2015.9

     More details

    Language:Japanese   Publisher:Architectural Institute of Japan  

    CiNii Article

    CiNii Books

    researchmap

  • 20153 Numerical Algorithm and Validation of the Macroscopic Evaluation Method : Macroscopic Evaluation Method of the Modified Sub-layer Model for the Uni-axial Stress Field Part2

    OKI Yusuke, TERANISHI Masaki, MOTOYUI Shojiro

    Summaries of technical papers of annual meeting   2015 ( 2015 )   305 - 306   2015.9

     More details

    Language:Japanese   Publisher:Architectural Institute of Japan  

    CiNii Article

    CiNii Books

    researchmap

  • OS0808-363 Image-based Finite Element Elasto-plastic Analysis for Evaluation of Stress Concentration around Inclusions of Cast Aluminum Alloy

    TERANISHI Masaki, MATSUMURA Keigo, GENNAI Shota, KUWAZURU Osamu, KOBAYASHI Masakazu, TODA Hiroyuki

    The Proceedings of the Materials and Mechanics Conference   2015   _OS0808-36 - _OS0808-36   2015

     More details

    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    The crack initiation mechanism of cast aluminum alloys is addressed through the image-based finite element analysis. By using the synchrotron radiation CT, the initiation and extension of fatigue crack has been observed. The fatigue crack is initiated by the break of silicon particles near the pores, while its mechanism is not clear. To understand the stress and strain fields around silicon particles under cyclic loading, the finite element elasto-plastic finite-strain analyses were carried out. From the fatigue test and its in situ CT observation, the broken and unbroken silicon particles were identified. Their finite element models were semi-automatically generated from the initial CT image, where a few tens of silicon particles were included. By comparing the history of stress and strain between broken and unbroken silicon particles, we examined the trigger of breakage of silicon particle, that is, the cause of crack initiation.

    DOI: 10.1299/jsmemm.2015._os0808-36

    CiNii Article

    researchmap

  • 20167 Macroscopic Evaluation Method of Sub-layer Model Composed Perfect Elastic Plasticity Layer for Multi-axial Stress State : Part3 Contracting to Plane Stress State

    TERANISHI Masaki, MOTOYUI Shojiro

    Summaries of technical papers of annual meeting   ( 2013 )   333 - 334   2013.8

     More details

    Language:Japanese   Publisher:Architectural Institute of Japan  

    CiNii Article

    researchmap

  • 20170 Macroscopic Evaluation Method of the Sub-layer Model Considerring Hardening Low For Uni-axial Stress Field

    AMAKAWA Tatsushi, TERANISHI Masaki, MOTOYUI Shojiro

    Summaries of technical papers of annual meeting   ( 2013 )   339 - 340   2013.8

     More details

    Language:Japanese   Publisher:Architectural Institute of Japan  

    CiNii Article

    researchmap

  • 20131 Macroscopic Evaluation Method of Sub-layer Model Composed Perfect Elastic Plasticity Layer for Multi-axial Stress State : Part2 Numerical Analysis

    TERANISHI Masaki, MOTOYUI Shojiro

    Summaries of technical papers of annual meeting   ( 2012 )   261 - 262   2012.9

     More details

    Language:Japanese   Publisher:Architectural Institute of Japan  

    CiNii Article

    researchmap

  • 20130 Macroscopic Evaluation Method of Sub-layer Model Composed Perfect Elastic Plasticity Layer for Multi-axial Stress State : Part1 Formulation of Macro model

    AMAKAWA Tatsushi, MOTOYUI Shojiro, TERANISHI Masaki

    Summaries of technical papers of annual meeting   ( 2012 )   259 - 260   2012.9

     More details

    Language:Japanese   Publisher:Architectural Institute of Japan  

    CiNii Article

    researchmap

  • 完全弾塑性体から成るサブレイヤーモデルの多軸応力状態における巨視的評価手法 その2:数値解析

    寺西正輝, 元結正次郎

    日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)   2012   2012

  • 完全弾塑性体から成るサブレイヤーモデルの多軸応力状態における巨視的評価手法 その1:巨視的モデルの定式化

    天川達志, 元結正次郎, 寺西正輝

    日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM)   2012   2012

  • 20394 Numerical Analysis of Hanger Joint of Steel Celing for Vibration in Direction of Channel : A Study on Properties of Vibration in Direction of Channel Part2

    SHIMIZU Yuichiro, MOTOYUI Shojiro, TERANISHI Masaki

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures   2011 ( 2011 )   787 - 788   2011.7

     More details

    Language:Japanese   Publisher:Architectural Institute of Japan  

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • 20393 Dynamic Characteristics of Steel Ceiling for Vibration in Direction of Channel : A Study on Properties of Vibration in Direction of Channel Part1

    TERANISHI Masaki, MOTOYUI Shojiro, SHIMIZU Yuichiro

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures   2011 ( 2011 )   785 - 786   2011.7

     More details

    Language:Japanese   Publisher:Architectural Institute of Japan  

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

▶ display all

Research Projects

  • 樹種毎の木材接合部のめり込みメカニズムの解明

    2022.6 - 2023.3

    内田エネルギー科学振興財団 

    寺西正輝,松原独歩

      More details

    Authorship:Principal investigator 

    researchmap

  • 鋼材における降伏棚近傍の硬軟化挙動を再現可能な材料構成則の開発とその活用に関する研究

    2022.4 - 2023.3

    (株)大林組  共同研究 

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • 有限要素解析と画像計測技術を活用した木質系材料の材料試験法の有効性に関する検討

    2021.6 - 2022.3

    新潟工学振興会  試験研究費 

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • 投影画像測定技術を用いた構造用鋼の材料試験の高精度化

    2021.5 - 2022.3

    公益財団法人ユニオンツール育英奨学会  科学技術研究費助成金 

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • 変動振幅時の鋼材の硬軟化挙動を再現可能な新たな材料構成則の開発とその活用に関する研究

    2021.4 - 2022.3

    (株)大林組  共同研究 

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • 三次元有限要素損傷解析を用いた木材のボルト接合部の破壊メカニズムの解明

    2021.4 - 2022.3

    前田記念工学振興財団  研究助成 

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • ニューラルネットワークを用いた有限要素法の積分点演算の高速化

    2020.6 - 2021.3

    公益財団法人ユニオンツール育英奨学会  科学技術研究費助成  助成金

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • 有限要素法を用いた鋼構造非線形解析の高精度化とその活用に関する研究開発

    2020.4 - 2021.3

    (株)大林組  共同研究  共同研究

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • 貝殻形態に基づく新たなシェル形態創出のための基礎的研究

    2019.10 - 2020.3

    日本建築学会北陸支部  2019 年度日本建築学会北陸支部奨励研究  奨励研究

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • プレストレスを利用する新しい木質ラーメン用剛接合部の開発

    Grant number:19K06180  2019.4 - 2022.3

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    松原 独歩, 若島 嘉朗, 北守 顕久, 清水 秀丸, 寺西正輝

      More details

    Authorship:Coinvestigator(s) 

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    本研究は、プレストレスを利用した木質材料同士の新しい剛接合部の開発を目指すものである。
    プレストレスを利用するには、時間経過と共に応力が減少する応力緩和挙動の長期的把握とその抑制方法について検討する必要があるが、2019年度はこの応力緩和実験の開始と、プレストレスを与えた接合部のモーメント抵抗性能を評価するのに重要であると考えられる内力係数(外力に対するボルト軸力増分の割合)について検討した。
    応力緩和実験では、①木材の繊維に対する直交方向(横圧縮)、②木材の繊維方向(縦圧縮)、③圧縮木材を接着挿入、④LVLを接着挿入、⑤縦圧縮と横圧縮の組み合わせ、⑥圧縮木接着挿入と縦圧縮の組み合わせ、⑦LVL接着挿入と縦圧縮の組み合わせ、の試験体を用意し、ボルトを用いて応力を与えた。それぞれ、劣化促進処理(飽水、 乾燥、飽水、乾燥、静置(2 日間)を順に行う。飽水処理は 20±3℃で 4 時間、乾燥処理は、60±3℃の恒温環境にて 20 時間、静置は室内で実施)、富山県農林水産総合技術センターの小屋裏に放置し、応力緩和挙動を観察した。2020年3月現在、劣化促進処理においては、LVL を用いた試験体の値が高く、応力緩和率約0.4を保持し、小屋裏に放置した試験体では、圧縮木挿入が応力緩和率約0.85 を保持することがわかった。
    内力係数に関する検討では、引きボルト接合の軸方向引張実験から、初期プレストレスが大きいほど内力係数は低下傾向を示すと共に、定着長さが長くなるほど、その低下傾向は小さくなることがわかった。

    researchmap

  • 多軸応力下の材料構成則へのニューラルネットワークの適用性に関する研究

    Grant number:19K15136  2019.4 - 2021.3

    日本学術振興会  科学研究費助成事業 若手研究  若手研究

    寺西 正輝

      More details

    Authorship:Principal investigator 

    Grant amount:\2600000 ( Direct Cost: \2000000 、 Indirect Cost:\600000 )

    researchmap

  • 有限要素法を用いた鋼構造非線形解析の高精度化とその活用に関する研究開発

    2019.4 - 2020.3

    (株)大林組  共同研究 

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • 大規模有限要素解析の実行に向けたニューラルネットワークによる材料構成則の開発

    2018.10 - 2019.3

    福井大学  平成30年度福井大学研究育成経費 

    寺西正輝

      More details

    Authorship:Principal investigator 

    researchmap

  • Realization of image-based massively-parallel finite element analysis using synchrotron radiation CT for metallographic structures

    Grant number:16K13735  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    KUWAZURU Osamu, TERANISHI Masaki

      More details

    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    Grant amount:\3770000 ( Direct Cost: \2900000 、 Indirect Cost:\870000 )

    A feasibility of large-scale image-based simulation using a supercomputer and a synchrotron radiation CT was examined. To overcome the difficulty in the mesh generation based on images, which encumber the large-scale simulation, we employed the voxel element in line with the voxel-to-element strategy. As a result, it became possible to perform a large-scale finite element analysis considering microscopic metallographic structures and we clarified that the elastic-plastic and finite strain analysis can be done up to about one hundred million elements. Moreover, we introduced a heterogeneous voxel element which can use different material property at each integration point within a single element, and examined that this element could reduce the numerical error due to the inaccuracy in shape which is specific to the voxel element. We conducted the micromechanical fatigue simulation for the cast aluminum alloy and discussed the mechanism of fatigue crack initiation from material surfaces.

    researchmap

  • A New Concept Breakthrough in Materials Development: Reverse 4D Materials Engineering

    Grant number:24226015  2012.5 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)  Grant-in-Aid for Scientific Research (S)

    Toda Hiroyuki

      More details

    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    Grant amount:\163410000 ( Direct Cost: \125700000 、 Indirect Cost:\37710000 )

    Material development methodology called Reverse 4D Material Engineering (R4ME) has been established. We have divided the optimization targets into two cases; "microstructure cluster control" and "single microstructure control" to make R4ME applicable to various issues in the materials and mechanical engineering. In particular, we have created a data coarsening method, optimization method and R4ME methodology appropriate for adapting them. We have shown that R4ME enables to use the information about a huge number of microstructural features embedded in one high-resolution 3D image as big data. The optimization of polycrystalline microstructure is also possible by employing the polycrystalline imaging technique.

    researchmap

▶ display all

 

Teaching Experience

  • 総合技術科学演習

    2022
    Institution name:新潟大学

  • 構造システム論II

    2022
    Institution name:新潟大学

  • 建築構造解析学・演習III

    2022
    Institution name:新潟大学

  • リメディアル演習

    2022
    Institution name:新潟大学

  • 建築設計製図VII

    2021
    Institution name:新潟大学

  • 建築材料

    2021
    Institution name:新潟大学

  • 建築構造設計演習IV

    2021
    Institution name:新潟大学

  • 建築材料・構造実験I

    2021
    Institution name:新潟大学

  • 建築材料・構造実験II

    2021
    Institution name:新潟大学

  • 建築設計製図V

    2021
    Institution name:新潟大学

  • 建築設計製図II

    2021
    Institution name:新潟大学

  • 建築設計製図I

    2021
    Institution name:新潟大学

  • 建築設計製図VI

    2021
    Institution name:新潟大学

  • 建築構造設計演習III

    2021
    Institution name:新潟大学

  • 建築設計製図IV

    2021
    Institution name:新潟大学

  • 建築設計製図III

    2021
    Institution name:新潟大学

  • 建築構造設計II

    2021
    Institution name:新潟大学

  • 工学リテラシー入門(建築分野)

    2020
    Institution name:新潟大学

  • 建築学概論

    2020
    Institution name:新潟大学

  • 卒業研修又は基礎設計

    2020
    Institution name:新潟大学

  • 卒業研究又は設計

    2020
    Institution name:新潟大学

▶ display all