K-0824 地震荷重を受けるき裂付き配管の破面解析(S11-6 構造健全性評価(6))(S11 構造健全性評価)

概要

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In order to clarify the behavior of cracked pipes under seismic events, cyclic four-point bending tests were conducted on the straight pipes with an electric discharge machining notch. The specimens were subjected to the constant amplitude wave or random amplitude wave, and resulted in low-cycle fatigue failure. Fracture surfaces were observed using scanning electron microscope after the tests and crack propagation characteristic were obtained. From the results of fractography of the specimens, it seems that loading cycles to cause crack penetration were mainly consumed in crack propagation, not in crack initiation. And relation between crack propagation rate and the stress intensity factor range obtained from fractography showed good agreement with that of high-cycle fatigue test results.
社団法人日本機械学会の論文
2001-08-22