Fatigue strength evaluation of perforated plate at elevated temperature using stress redistribution locus method

応力再分配軌跡を用いた有孔平板の高温疲労評価

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

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

応力集中を受ける有孔平板の疲労特性に対する形状の影響を応力再配分軌跡法(SRL法)を適用し検討した。試験温度は、550Cであり、SUS304製の有孔平板を用いて疲労試験が実施された。有孔平板は、孔数と孔径をパラメータとした。試験体の幅方向に1つあるいは2つの孔を配置している。孔径は2mmから8mmである。

This study reports the effects of geometry on fatigue strength of the perforated plate at elevated temperature when SRL (Stress Redistribution Locus) Method is applied for the perforated plate with stress concentration. The test specimens made of SUS304 stainless steel are carried out by keeping temperature to be 550C. The geometry of the perforated plate specimens are changed systematically by the number of holes and diameter size of the hole, where one or two holes are placed along the width direction, and the diameter is set to be from 2 mm to 8 mm. Both of the load and displacement are measured in all the cyclic history of the loadings to study the relation between crack initiation/propagation and the load decrease from the direct observation of crack at the holes side.