各種鋼材の超低サイクル疲労破壊に関するエネルギー的考察

概要

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By using the various steels (SS400, SR295, D6 S35C, H6 KHT80, F6 SCM4, KPC H4, G4 1041 and E6 SCM4), the tensile fracture test after compressive loading (C+TF) is carried out on cylindrical specimens (G.L.=2.5D=28:25mm). As the results of the tests, it becomes clear that the elongation by the TF test is larger than the elongation by the monotonous tensile facture test. The cumulated damage energy, which dissipated at the last tensile fracture is almost the same with the cumulated damage energy which are defined as dissipated upper the loading value of P_y/2 under monotonous tensile fracture test. From the result of the super low cycle fatigue fracture tests under definite constant deformation amplitudes, it becomes clear that the D6 S35C material consumue the cumulated damage energy very much. On the extremely low cycle fatigue fracture tests, the ratio of cumulated damage energy for cumulated damage strain under the definite constant deformation amplitude test is from 1.1 to l.4 times as much as the ratio of damage energy for damage strain under the monotonous tensile fracture test.
社団法人日本建築学会の論文
2001-03-30