典型文献
Geometric effects on competing failure modes in lap shear testing of spot joints
文献摘要：
Whensubjectedtothelapsheartesting,spotweldscreatedbybrazing,resistancewelding,orothertechniquesmayfaileitherby a plug failure mode (also called pull-out mode) or an interfacial shear failure mode. In the past, plug failure mode was thought to be depend-ent on base metal ultimate tensile strength, spot diameter and plate thickness, while interfacial failure can be determined by interface shear strength and spot area. No fracture mechanics model or failure process is invoked in such an approach, and its predictive capability is often doubted compared to realistic experiments. This work conducts a parametric study to assess the failure behavior as a function of dominant three-dimensional geometric parameters based on the Gurson-Tvergaard-Needleman (GTN) damage mechanics model and no-damage mod-el respectively. Different necking conditions are considered as precursors to the two failure modes in the no-damage model. It is found out that a small ratio of spot diameter to plate thickness promotes interfacial shear failure while a large ratio favors plug failure. Other geometric parameters such as the filler interlayer thickness, if used, play a secondary role. The calculated peak force Fwt is not much different between the GTN and no-damage analyses, and better agreement is shown in the small nugget region. Normalized peak force calculated from the GTN model with the porosity f0 set to 0.01 showed the best agreement with pervious tensile shear tests on spot-welded DP980 lap joints in comparison to that calculated from the GTN model with f0 at 0.02 and the no-damage model. Note that heterogeneous distribution of materi- al strength across the joint region was considered in the GTN model, which was estimated based on the hardness map measured across the joint cross section.
文献关键词：
中图分类号：
作者姓名：
Tushar Telmasre;Abdelrahman Abdelmotagaly;Gao Yanfei;Yu Zhenzhen
作者机构：
Department of Metallurgical and Materials Engineering,Colorado School of Mines,Golden,CO 80401,USA;Department of Materials Science and Engineering,University of Tennessee,Knoxville,TN 37996,USA
文献出处：
引用格式：
[1]Tushar Telmasre;Abdelrahman Abdelmotagaly;Gao Yanfei;Yu Zhenzhen-.Geometric effects on competing failure modes in lap shear testing of spot joints)[J].中国焊接（英文版）,2022(03):8-16
A类：
Whensubjectedtothelapsheartesting,spotweldscreatedbybrazing,resistancewelding,orothertechniquesmayfaileitherby,doubted,Fwt,pervious
B类：
Geometric,effects,competing,failure,modes,joints,plug,also,called,pull,out,interfacial,In,past,was,thought,depend,metal,ultimate,tensile,strength,diameter,plate,thickness,while,can,determined,interface,area,fracture,mechanics,model,process,invoked,such,approach,its,predictive,capability,often,compared,realistic,experiments,This,work,conducts,parametric,study,assess,behavior,function,dominant,three,dimensional,geometric,parameters,Gurson,Tvergaard,Needleman,GTN,damage,respectively,Different,necking,conditions,considered,precursors,two,It,found,that,small,ratio,promotes,large,favors,Other,filler,interlayer,used,play,secondary,role,calculated,peak,force,not,much,different,between,analyses,better,agreement,shown,nugget,region,Normalized,from,porosity,f0,set,showed,best,tests,welded,DP980,comparison,Note,heterogeneous,distribution,materi,across,which,estimated,hardness,map,measured,section
AB值：
0.465678
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