動的き裂進展を伴う高分子材料の除荷挙動 : 第2報, PMMAとホマライト100の場合

Dynamic stress intensity factor KID and crack velocity a were determined using single-edgecracked tensile specimens of PMMA and Homalite-100. To study unloading behavior of the material, load P applied to the specimen was also evaluated as a function of time t. Unloading rate P, the time derivative of P, was determined to correlate with KID and a. The findings showed that the change in P was qualitatively in accord with the change in KID or a. However, there existed slight differences among the values of t giving peak values of P, KID and a, so that their order was a, P and KID.