국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Stress Analysis of a Crack in the Residual Stress Field by Welding and Its Application to the Fatigue Crack Propagation
저자	Hiroyuki Terada
Keyword	crack analysis; stress intensity factor; residual stress; butt weld; stress redistribution; fatigue crack propagation
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr01248.pdf?id=NALTR0001248
보고서번호	NAL TR-1248
발행년도	1994.9
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	ndicular to the welding bead subjected to the residual stress was carried out using a stress function.At first,the conditions which should be satisfied for the residual stress by welding were examined.Then the simulation function satisfying these conditions was proposed.Next,the stress intensity factors of an arbitrary crack perpendicular to the butt weld,which subjected to the effect of residual stress most severely,were derived by using the proposed function.The redistribution form of the residual stress near the crack was also eveluated and compared with the testing results obtained by Kanazawa,et al.Finally,the following effective stress intensity factor range ΔKeff,instead of conventional ΔK,was proposed to evaluate the effect of residual stress on the fatigue crack propagation of a crack.ΔKeff=ΔK(1＋Kres/ΔK) where,Kres is the stress intensity factor induced by residual stress by welding.The effectiveness of ΔKeff was proved by examining the experimental fatigue crack propagation data obtained by G