111 生体機能模倣型複合材料設計の提案 : 生体骨荷重支持構造の圧縮特性

概要

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On a structure using the material which demonstrates its mechanical function to the limit under given conditions, the most effective design of the function can be expected because the design of material and structure matches pertinent. One of the actual structures is natural bone. Design concept is based on the assumption that bones have optimum structures to mechanical conditions. For a long evolution process, bones have tried remodelling many times and have demonstrated its mechanical function to the limit. Therefore, development of the new material that considers the modelling of the mechanical composite structure of the bone to the optimum design of the new material, that is biomimetic design, is very rational thought. Cortical bone is the objective material of biomimetic design for the load support. At the beginning of our biomimetic design, the relation between the orientation of collagen fibers and the load support characteristics of cortical bone is investigated. The orientation of collagen fibers was measured by using square pillar specimens obtained from bovine femurs. Static compression tests were carried out using pillar specimens and internal micro fractures were observed by SEM. The characterization of the stress-strain curves was discussed on the fiber orientation and the micro fractures.
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