过载作用下两种疲劳裂纹扩展模型的比较.pdf

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1、第14卷第3期船舶力学Vol·14N0·32010年3月一一．!!竺竺型!!塑尘丝!!!兰!垄!些!：!旦塑一-_-●-_—-●——_——^___●-__-_-_____-●_●______________________-●_--_—_-___—————_--__●_-————_—_q_●--___-—_-__—___—●—一ArticleID：1007_7294(20lO)03如263—09AComparisonBetweenTwoModelsofFa，tigueCrackGrowthunderoverloadX

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4、esbetweenthetwomodelsarepI℃sentedandsuggestionsare91VentoutiIize也etwomodels．Keywords：fatiguecrackgrowth；oVerload；equiVaIentstr髑sinte璐i坶factorrange；fractllretoughne辎CLCn岫ber：TGl13．25+5U661．4Doc哪entcode：ANomenclature口．halfcracklength(mm)；oinitialhalfcraeklength(m

5、m)；R：stressI．atio：巾。：correctionfactorforthevariableamplitudeloading；K。秽equivalentstressintensityfactorrange，con-espondingtoK。血：maximumstressintensityfactorthreshold(MPa、／m)；尺=O(MPa、厂i)；K，。dmaximumstressintensityfactor，correspondingtoR=O(MPa、／m)；(do／d^7)cA：f．ati

6、guecrackgrowthrateunderconstantamplitude(mrll／cycle)；，．oIjplasticzonesizeaheadofthecracktipwhentheoVerloadoccurs(mHl)；Poma)【imum10ad(MPa)；n“halfcracklen昏hwhentheoVerloadoccurs(mm)；A：constantinpresentequation；肘《con．ectionf如torfbrtheloadratio；K。：maximumstressinte

7、nsityfactor(MPa、／m)；，n，乃，r，p，卢1：sh印ingexponents；Receiveddate：2009—11—09Biography：XUXiao—dong(1984-．，male，masterofShanghaiJiao7rongUIliVe瑚ity；CUlwei—chen甙1963_)，male，Ph．D．，resea咒herofCSsllC．船舶力学第14卷第3期△Ktll：stressintensityfactorrangethresh01d(MPa～厂i)；△K旧：stressi

8、ntensityfactorrange，correspondingtoR=O(MPa弋v／i)；(do／d^7)vA：fatiguecrackgrowthrateunderVariableamplitudeloading(mIn／cycle)；ry：plasticzonesizeaheadofthecracktip(mm)；K：fracture