701 Virtual Crack Extension Analysis in the Fatigue Evaluation of Plate

Abstract

Higb−temperat 田 ・ e plants ， such as nuclear and thermal power p 監 ants are used under severe condltio 皿 s ． Higb temperature plants are susceptible to rnicro − cracks in its structure ． This is because there is the effect ofcyclic fatigue and creep fatigue ． To prevent serious accidents ， induding small defectg ． in the structure ， we predicted the destruction ， we must use safely ． In particular ， the evaluation of fatiguc crack is impo 震ant ． In this study ， we analyzed the J ・ integral using the virtual crack extensiQn metho 虔 a 皿 d 五nite e 互 ement method ． Analysis model is a two ・ dimensional flat plate with a crack in the center ， it is assumed that the load on fatigue ． MoreQver ， we examine the effect of the amount ef virtual crack extensien used in the analysis ．