牛大腿骨内異方性残留応力の白色X線測定

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It is well known that bone has a capability to adapt to usual mechanical environment and to reconstruct functionally its structure and geometry. This phenomenon is called as the adaptive bone remodeling. One of the most important mechanical factor of the remodeling is the stress. To generate the bone remodeling, the stress should remain to stimulate the osteocyte in the relative long period. Thus stress will be a kind of residual stress. To verify this assumption, it is a great significance to measure the residual stress is intact bone tissue. Bone has extremely anisotropic structure which consists of hydroxyapatite crystals. In this work, a method to measure the anisotropic residual stress in compact bone is proposed using the polychromatic X-ray diffraction method. The interplanar spacing of the hydroxyapatite in the bone can be measured by using the polychromatic X-rays diffraction. The ratio of atomic interplanar distance of a strained to a nonstrained specimen was defined as the lattice strain. The biaxial residual stress could be calculated from the lattice strains measured at three directions. The compact bone of bovine diaphysis was used as a specimen. To observe the difference of region, the specimen was taken from the middle region of diaphysis divided into four parts : anterior, posterior, medial, lateral, at each bone axial and circumferential directions. As a result, it was confirmed that the residual stress in the bone could be evaluated nondestructively by this method. The tensile residual stress were found in the bone axial direction of the bovine femoral bone.
社団法人日本機械学会の論文
1999-02-25

牛大腿骨内異方性残留応力の白色X線測定

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