高温での円孔板のき裂の発生と進展の観察

Observation of initiation and propagation crack of perforated plate at elevated temperature

Bubphachopt, B.*; 渡部 修*; 川崎 信史 ; 笠原 直人

Bubphachopt, B.*; Watanabe, Osamu*; Kawasaki, Nobuchika; Kasahara, Naoto

本研究は、SUS304製有孔平板の高温疲労試験におけるリアルタイムでの観察結果を報告したものである。半径2, 4, 6mmの半孔を試験片表面に加工し、疲労試験を実施、半孔表面から発生するき裂の発生繰返し数と発生き裂個数を計測した。

This study reports the real-time observation results on fatigue phenomena of the perforated plate and the half circular- hole notched plate made of SUS 304 stainless steel at elevated temperature. The crack initiates on the surface from the hole-side in the thickness direction and the crack initiates from the mid-surface along the thickness direction. After the crack initiation, it propagates and coalesces to fail finally. The number of micro or mini crack is summarized as a function of applied cyclic number.