The Mode II crack flank displacement and crack growth responses of three precracked specimens made from structural steel were measured, using plastic replicas and a crack-tip compliance gage. Crack surface interaction wasfound to dominate behavior: at low stress intensity range (ΔK I I n o m = 9 MPa √m) the precracks did not suffer reversed slip to their tips and no crack growth occurred, while at high stress intensity range (ΔK I I n o m = 19 MPa √m) the effective stress intensity range was less than half that nominally applied. Three sources of crack flank frictional attenuation were identified: compressive residual stresses due to precracking, Mode I wedging over asperities, and gross plastic deformation of interlocking asperities. The measured unlocking response was modeled successfully by assuming that crack flank frictional stresses obeyed a constant interfacial shear stress friction law.
采用塑性模型和裂纹尖端柔度仪测量了3个结构钢预制裂纹试件的II型裂纹侧面位移和裂纹扩展响应。在低应力强度范围内(ΔK I I I I nom = 9 MPa√m)，预裂纹不会发生向尖端的反向滑移，也不会发生裂纹扩展;而在高应力强度范围内(ΔK I I I nom = 19 MPa√m)，预裂纹的有效应力强度范围不到名义上应用的一半。确定了裂纹侧面摩擦衰减的三个来源:预裂引起的压残余应力，在凸起上的I型楔入，以及互锁凸起的总塑性变形。假设裂纹侧面的摩擦应力服从恒定的界面剪应力摩擦规律，成功地模拟了实测的解锁响应。
{"title":"Toward an understanding of Mode II fatigue crack growth","authors":"Michael C. Smith, Roderick A. Smith","doi":"10.1520/STP23220S","DOIUrl":"https://doi.org/10.1520/STP23220S","url":null,"abstract":"The Mode II crack flank displacement and crack growth responses of three precracked specimens made from structural steel were measured, using plastic replicas and a crack-tip compliance gage. Crack surface interaction wasfound to dominate behavior: at low stress intensity range (ΔK I I n o m = 9 MPa √m) the precracks did not suffer reversed slip to their tips and no crack growth occurred, while at high stress intensity range (ΔK I I n o m = 19 MPa √m) the effective stress intensity range was less than half that nominally applied. Three sources of crack flank frictional attenuation were identified: compressive residual stresses due to precracking, Mode I wedging over asperities, and gross plastic deformation of interlocking asperities. The measured unlocking response was modeled successfully by assuming that crack flank frictional stresses obeyed a constant interfacial shear stress friction law.","PeriodicalId":55585,"journal":{"name":"Atw-International Journal for Nuclear Power","volume":"33 1","pages":"260-280"},"PeriodicalIF":0.1,"publicationDate":"1988-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81576913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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