焊接接头界面裂纹应力强度因子的数值分析  

Numerical analysis of stress intensity factor for interfacial cracks in welded joints

作　　者：周莉[1] 平学成[2] 陈梦成[2] 

机构地区：[1]江西航空职业技术学院,南昌市330046 [2]华东交通大学机电学院,南昌市330013

出　　处：《焊接》2008年第6期31-34,共4页Welding & Joining

基　　金：江西省自然科学基金资助项目(2007GZW0862);华东交通大学校立科研基金资助(07JD01);江西省载运工具与装备重点实验室资助

摘　　要：建立了一种新型界面裂纹尖端奇异单元模型,该单元能真实地反映界面裂纹尖端的奇异性状况。将奇异单元与全域杂交元结合,分析对接焊接接头界面裂纹,考察了裂纹长度和母材与焊接材料不匹配程度等因素对应力强度因子的影响。结果表明,在拉伸载荷作用下,两母材弹性模量差异很大时,剪切应力是接头破坏的主要因素;焊接材料的弹性模量较大时,界面裂纹的应力强度因子几乎不受焊接材料弹性模量的影响。A kind of novel singular element that really reflects the singular status of interfacial cracks is established.Assembled with standard 4-node quadrilateral hybrid element,the model is used to analyze the stresse of interfacial crack of butt welded joints,the influence of crack length and material mismatche on SIFs is investigated by numerical analysis.The results show that shear stresse is the major factor of joint failure at the tensile load when the elastic modulus of the two base materials has distinct difference,and the stress intensity factor is nearly invariable when the elastic modulus of the solder is very large.

关 键 词：焊接接头 杂交元 奇异单元 应力强度因子 

分 类 号：TG405[金属学及工艺—焊接]