形状記憶TiNi埋め込みファイバの収縮効果を利用した複合材料のき裂閉鎖作用 : ドメイン寸法による効果

抄録

Shape memory TiNi fiber reinforced/epoxy matrix composite is fabricated to demonstrate the suppression effect of crack-tip stress concentration and the control of fracture toughness K value of the composite. The decrease of fracture toughness was attributed to the compressive stress field in the matrix which was induced when the prestrained TiNi fibers contract to the initial length upon heating above austenitic finish temperature of TiNi fiber (>A_f). The dependencies of K values on the prestrain value of TiNi fibers as well as crack-tip compressive stress domain size are discussed based on the analytical equivalent inclusion model for composite.