T型焊接接头的抗疲劳裂纹扩展设计研究  

Study on Anti-Fatigue Crack Propagation Design of T-Type Welded Joints

作　　者：陆地[1] 崔璐[1] 崔俊航 LU Di;CUI Lu;CUI Jun-hang(School of Mechanical and Electrical Engineering,Xi’an University of Architecture and Technology,Shaanxi Xi’an710055,China;School of Mechanical Engineering,Northwestern Polytechnical University,Shaanxi Xi’an710072,China)

机构地区：[1]西安建筑科技大学机电工程学院,陕西西安710055 [2]西北工业大学机电学院,陕西西安710072

出　　处：《机械设计与制造》2020年第1期89-91,95,共4页Machinery Design & Manufacture

摘　　要：针对焊接机械结构中出现的焊接接头疲劳断裂现象,从裂纹扩展的角度分析结构参数对结构疲劳强度的影响情况,为进行焊接结构的抗疲劳设计提供依据。建立了含表面裂纹T型焊接接头的有限元模型,采用扩展有限元法计算外载荷作用下的裂纹尖端应力强度因子,探寻T型焊接接头的结构参数发生变化时,对相同载荷条件下表面裂纹应力强度因子的影响规律。采用研究结果指导T型焊接接头的设计,提高焊接机械结构的疲劳强度和可靠性,降低断裂事故的发生。The fatigue fracture of the welded joint in the welding machinery structure is analyzed,and the influence of the structural parameters on the structural fatigue strength is analyzed from the angle of crack propagation,which provides the basis for the fatigue design of the welded structure. The finite element model of T-Type welded joint with surface crack is established. The finite element method is used to calculate the stress intensity factor of the crack tip under external load.When the structural parameters of T-Type welded joint are changed,the surface crack The Law of Influence of Stress Intensity Factor. The results of the study guide the design of T-Type welded joints to improve the fatigue strength and reliability of the welding machinery structure and reduce the occurrence of fracture accidents.

关 键 词：抗疲劳设计 T型焊接接头 裂纹扩展 应力强度因子 

分 类 号：TH16[机械工程—机械制造及自动化]