基于应力三轴性的焊接接头断裂参量工程估算  

Engineering assessment of fracture criterion of welded joints based on stress - triaxiality

作　　者：张敏[1] 马博[1] 吕振林[1] 周永欣[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《兵器材料科学与工程》2004年第6期43-47,共5页Ordnance Material Science and Engineering

基　　金：陕西省教育厅自然科学基金资助项目(01JK134)

摘　　要：结合均匀材料裂纹结构应力场解的研究成果,讨论了平面应变状态下,焊接接头裂端应力场的J-Q双参数描述方法。考虑到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,利用有限元数值解对J积分和Q因子的分布规律进行了研究,结合工程实际,进一步通过曲线拟合得到了焊接接头裂端应力场的工程估算公式,并对估算公式的有效性进行了验证。Based on the results of the solution of stress - strain yield of homogeneous materials containing defects, the double - parameter J- Q method used to welded joints on the plane strain condition is analyzed in this paper. Considering the mechanical inhomogeneity of the welded joints, the distributions of the J - integral and Q factors, which express stress - triaxi-ality near crack tip of welded joints, are discussed by use of the finite element method. Furthermore, the engineering assessment method of calculating stress yield is realized through curve simulations, and its validity of the formulation is tested too.

关 键 词：焊接接头 J积分 断裂 应力场 不均匀性 结构应力 曲线拟合 双参数 因子 参量 

分 类 号：TG407[金属学及工艺—焊接] TG457