純チタン材の非弾性変形と微視的構造変化(J10-1 チタン系材料の力学・強度特性,J10 チタン系材料の力学・強度特性と応用技術)

概要

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Commercially pure (CP) titanium is widely used for biomaterials because of its good biocompatibility. Actually used biomaterials for a stent, for example, are subjected to inelastic deformation. However the inelastic deformation of CP titanium has not been clarified yet. In this paper, inelastic deformation, especially, viscoplastic deformation such as strain rate effect, creep, stress relaxation and uniaxial ratchetting are investigated by a series of tests using CP titanium at room temperature. Microscopic observation is also conducted by uniaxial loading tests using a rectangular specimen. The test results show that the CP titanium has large viscoplastic deformation, and especially large creep deformation and stress relaxation cause a problem to use CP titanium for a biomaterial.
社団法人日本機械学会の論文
2004-09-04