HT 80 鋼の室温・定荷重下の延性破壊挙動

概要

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Room temperature uniaxial constant-loading tensile tests on HT80 steel showed significant creep. At stress levels around the yield strength, the creep was primary; but accelerating creep was found near the ultimate strength. Room temperature constant-loading fracture toughness tests on HT80 steel also showed significant creep. Time-dependent crack growth was found under the fracture toughness tests. The crack growth resistance under constant loading was lower than that under the conventional displacement-controlled fracture toughness test. The critical J-value at the stabilized load above which unstable fracture occurred, was 1.26 times the J_<IC>-value. The stable crack under constant loading seemed to propagate by repeating the blunting and re-nucleation processes. The crack growth rate at room temperature under constant loading was found to be controlled by the modified J-integral, J^^..
一般社団法人日本機械学会の論文
1986-02-25