基于J～Q双参数准则的含缺陷焊接接头失效评定曲线研究(Ⅱ)  

Failure assessment curves of double-parameter J-Q criterion of welded joints containing defect(Ⅱ)

作　　者：张敏[1] 马博[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《焊接学报》2004年第6期38-42,共5页Transactions of The China Welding Institution

基　　金：陕西省教育厅自然科学基金资助项目 (0 1JK134 )

摘　　要：基于均匀材料裂纹结构应力应变场解的研究现状 ,考虑了应力三轴性对焊接接头裂纹尖端应力应变场的影响 ,建立了基于J～Q双参数准则的焊接接头失效评定曲线。对于焊接接头力学不均匀性对J积分和三轴性应力因子Q的影响 ,利用有限元数值解研究了J积分和Q因子的分布规律 ,结合工程实际 。Considering the present results of stress-strain field of homogenous materials containing defects and the influence of stress-triaxiality on stress-strain field near crack tip of welded joint and based on the double-parameter J-Q criterion, the failure assessment curves of welded joints are builded. For the effects of mechanical inhomogeneity of the welded joints, the distributions of the J-integral (J) and stress-triaxiality Q factors (Q) are discussed by using of the finite element method. The engineering treatment method of each parameter of failure assessment curve is realized through curve simulations to engineering practice.

关 键 词：失效评定曲线 J^Q双参数准则 焊接接头 有限元方法 

分 类 号：TG401[金属学及工艺—焊接]