基于流变应力的角焊缝强度分析评定方法研究  

RESEARCH ON THE STRENGTH EVALUATION METHOD OF FILLET WELD BASED ON FLOW STRESSES

作　　者：陈明亚[1,2] 赵万祥 高红波[1,2] 周帅 林磊 彭群家 史芳杰[1,2] 余伟炜 CHEN MingYa;ZHAO WanXiang;GAO HongBo;ZHOU Shuai;LIN Lei;PENG QunJia;SHI FangJie;YU WeiWei(Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou 215004,China;National Nuclear Power Plant Safety and Reliability Engineering Research Center,Suzhou 215004,China)

机构地区：[1]苏州热工研究院有限公司,苏州215004 [2]国家核电厂安全及可靠性工程技术研究中心,苏州215004

出　　处：《机械强度》2024年第6期1333-1337,共5页Journal of Mechanical Strength

基　　金：国家重点研发计划(2020YFB1901500,2021YFB3702602)资助。

摘　　要：由于施工简单,角焊缝常广泛应用于金属部件的连接之中。角焊缝中存在明显非自平衡的拉伸焊接残余应力,现有的评估规范中尚缺乏明确的应力校核方法。在《钢结构设计规范》等评定规范中,给出的强度计算准则未考虑角焊缝的弯矩载荷和焊接残余应力影响,限制了相关方法的应用范围。基于角焊缝连接件的强度实验测试和理论研究,提出了基于焊缝材料流变应力的强度分析评定的方法。角焊缝连接件强度实验的结果表明,最大拉伸载荷对应的焊缝强度与实验测试抗拉和屈服强度差值的均值较为接近。由此可认为,角焊缝中均匀存在接近屈服应力的焊接残余应力,在加载过程中,角焊缝中应力增加到抗拉强度时发生失效。在纯剪切条件下,角焊缝连接件的最大承载载荷与拉伸载荷作用下的数值接近。在考虑角焊缝材料焊接残余应力的条件下,基于流变应力的角焊缝评定准则中材料评定系数为0.8,并间接给出了在拉伸和弯矩载荷作用下的角焊缝连接件的评定准则。Due to the simple construction,fillet welds are often widely used in the connection of metal components.However,the non-self-balancing welding residual stress in the fillet weld is obvious,and the existing evaluation codes and standards still lack a clear stress checking method.In the assessment codes such as Code for design of steel structures,the influence of bending moment load and welding residual stress of fillet weld isn't considered in the given strength calculation criterion,which limits the application range of related methods.Based on the experimental test and theoretical research on the strength of fillet weld joints,a method of strength evaluation based on the flow stress of weld material was proposed.The strength experiment results of fillet weld connectors show that the weld strength corresponding to the maximum tensile load is very close to the mean value of the difference between the tensile and yield strength of the experimental test.It can be considered that the welding residual stress in the fillet weld is close to the yield stress,and the failure occurs when the stress in the fillet weld increases to the tensile strength during the loading process.Under pure shear condition,the maximum load of fillet weld connector is close to the value under tensile load.Under the condition of considering the welding residual stress of fillet weld material,the material evaluation coefficient of fillet weld evaluation criterion based on flow stress is set to be 0.8,and the evaluation criterion of fillet weld connector under tensile and bending moment load is also indirect given.

关 键 词：角焊缝 强度分析 流变应力 实验研究 

分 类 号：TL351.6[核科学技术—核技术及应用]