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

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

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.