Faculty Profiles - KOBAYASHI Koichi

Papers - KOBAYASHI Koichi

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Correlation of Volumetric Bone Mineral Density with Mechanical Properties of Rat Femoral Cortical Bone Using Nanoindentation

SAKAMOTO Makoto, SATO Kenji, TANABE Yuji, MURATA Fuyuki, KOBAYASHI Koichi, SAKAI Jun, HARA Toshiaki, OMORI Go

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 26 35 - 40 2005.10

Accuracy Verification of a Newly Developed Turntable X-ray System in Three-Dimensional Leg Alignment Assessment System

YAMAZAKI Yoshihiro, KOBAYASHI Kouichi, SAKAMOTO Makoto, TANABE Yuji, OMORI Go, KOGA Yoshio, SATOU Takashi, SOBUE Ten

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 26 181 - 186 2005.10

The axisymmetric contact problem of a transversely isotropic layer subjected to a tensile stress applied over a circular region Reviewed

Sakamoto M, Kobayashi K

Theoretical and Applied Mechanics 54 3 - 15 2005.10

Relationships between Mechanical Properties and Volumetric Bone Mineral Density of Rat Femoral Cortical Bone

SAKAMOTO Makoto, SATO Kenji, TANABE Yuji, KOBAYASHI Koichi, MURATA Fuyuki, SAKAI Jun

Journal of JSEM 5 ( 1 ) 40 - 44 2005.3

Relationships between Mechanical Properties and Volumetric Bone Mineral Density of Rat Femoral Cortical Bone

Sakamoto Makoto, Sato Kenji, Tanabe Yuji, Kobayashi Koichi, Murata Fuyuki, Sakai Jun

実験力学 5 ( 1 ) 40 - 44 2005.3

Language：Japanese

The mechanical properties of cortical bone are a consequence of the interaction between the mineral and collagen components. Small variations in the amount of mineral present in a section of bone can have a large influence on its mechanical properties. Studies have shown the correlations between Vickers microhardness and mineral content, and Vickers microhardness and elastic modulus using three-point and four-point bending tests. However, the precise nature of statistical relationship has yet to be established. Nanoindentation, which evolved from Vickers microhardness test, allows for measurement of mechanical properties of cortical bone at the nanometer scale. The nanoindentation technique has been applied to estimate mechanical properties of bone at a microscopic length scale, overcoming the limitations of traditional mechanical tests for small specimens. In this study, the relationships between mechanical properties measured by nanoindentation and volumetric Bone Mineral Density (vBMD) measured by peripheral Quantitative Computed Tomography (pQCT) in femoral cortical bone from a variety of ages of rats were investigated. The specimen of rat cortical bone used here was Haversian bone. Experimentally measured elastic modulus was correlated with vBMD (r=0.80). It was found that a good correlation also existed between hardness and vBMD (r=0.81).

DOI： 10.11395/jjsem.5.40

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Relationship between 3D structural and torsional properties of bovine trabecular bone

KOBAYASHI Koichi, KAITOH Takanori, YAMADA Mayu, SAKAMOTO Makoto, TANABE Yuji, HARA Toshiaki

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 25 1 - 6 2004.11

Measurement of Water Content in Articular Cartilage Using Near Infrared Spectroscopy (2^<nd> Report) : Relationship between cartilage degeneration and recovery rate of NIR absorbance for cartilage

HAMADA Kazunari, TANABE Yuji, KIKUCHI Tatsuya, KOBAYASHI Koichi, SAKAMOTO Makoto, KOGA Yoshio

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 25 103 - 107 2004.11

Nano-Mechanical Properties of Hard Tooth Tissues

SAKAI Jun, KODA Fumikazu, SAKAMOTO Makoto, KOBAYASHI Koichi, HARA Toshiaki, ITOH Hidemi, HASEGAWA Hiroshi, KUROE Toshifumi, OHATA Noboru

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 25 229 - 233 2004.11

Biomechanical Evaluation of Anterior Cruciate Ligament by Tensile and Tensile-Torsional Tests

TAKAYANAGI Tsutomu, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji, SEGAWA Hiroyuki, OOMORI Go, KOGA Yoshio

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 25 167 - 171 2004.11

Measurements of Elastic Modulus and Hardness of Bovine Vertebral Shell Using Nanoindentation

SAKAMOTO Makoto, MURATA Fuyuki, KOBAYASHI Koichi, SATO Kenji, SAKAI Jun, TANABE Yuji, HARA Toshiaki, OMORI Go

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 25 19 - 24 2004.11

The axisymmetric contact problem of an elastic layer subjected to a tensile stress applied over a circular region Reviewed

Sakamoto M, Kobayashi K

Theoretical and Applied Mechanics 53 27 - 36 2004.10

Mechanical Properties of Ultra High Molecular Weight Polyethylene under Impact Compression : Property Change with Gamma Irradiation and Dynamic Stress-Strain Analysis of Artificial Hip Joint

KOBAYASHI Koichi, KAKINOKI Toshihiko, TANABE Yuji, SAKAMOTO Makoto

Journal of JSEM 3 ( 4 ) 225 - 229 2003.12

Evaluation of Microhardness of Permanent and Primary Tooth

SAKAI Jun, KOUDA Fumikazu, SAKAMOTO Makoto, KOBAYASHI Koichi, MARUYAMA Yasuo, ITOH Hidemi, HARA Toshiaki

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 24 133 - 137 2003.11

Measurements of Mechanical Properties of Cortical Bone Using Nanoindentation Tests

SAKAMOTO Makoto, SATO Kenji, KOBAYASHI Koichi, SAKAI Jun, TAKANO Eisuke, HARA Toshiaki

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 24 1 - 5 2003.11

超微小押込み試験を用いた硬組織の力学的性質測定

坂本信, 佐藤憲二, 甲田文一, 坂井淳, 小林公一, 田辺裕治, 伊藤秀美

日本実験力学会講演論文集 ( 3 ) 127 - 130 2003.7

Split-Hopkinson Pressure-Bar Test using Striker Bar With Variable Cross Section

KOBAYASHI Koichi, TANABE Yuji

Journal of JSEM 2 ( 2 ) 35 - 39 2002.6

Strength Criterion for Bovine Tibial Trabecular Bone under Multiaxial Stress Reviewed

KOBAYASHI Koichi, SAKAI Jun, SAKAMOTO Makoto

Theoretical and Applied mechanics 50 91 - 96 2001.10

Mechanical Behaviour of Bovine Trabecular Bone Subjected to Impact Compressive Load

KOBAYASHI Koichi, TANABE Yuji, HARA Toshiaki

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 63 ( 616 ) 2624 - 2630 1997.12

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

Dynamic compressive behaviour of bovine trabecular bone was investigated. Compression tests on cylindrical specimens of bovine distal femurs were carried out using the split-Hopkinson pressurebar (SHPB) technique at strain rates ranging from 100 to 700 s-1. Quasi-static compression tests were also performed using an Instron-type materials testing machine at strain rates of 2&times;10-4 and 2&times;10-3 s-1. Stiffness and ultimate strength were greater at greater apparent density and at higher strain rate. Both stress relaxation and creep functions were determined based on stress-time and strain-time relations obtained by the SHPB tests. Relaxation time and retardation time had no correlation with apparent density. The three-element standard linear solid model was then validated by these functions. The elastic spring stiffness of the model, E1, had a strong positive correlation with apparent density, while the elastic spring stiffness, E2, and the viscosity coefficient, &eta;, showed less correlation with apparent density. No significant differences in the relaxation and retardation times, the elastic spring stiffnesses, E1, E2, and the viscosity coefficient, &eta;, were observed between the specimens with and without marrow.

DOI： 10.1299/kikaia.63.2624

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Mechanical Properties of Articular Cartilage Under Confined and Unconfined Compressions

KOBAYASHI Koichi

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 17 343 - 348 1996.10

Tempertaure dependence of viscoelastic properties of bovine compact bone

ONISHI Masafumi

日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research 16 433 - 436 1995.10

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