Abstract The residual stresses associated with fusion welding processes have recently become a popular issue considering the reliable design of structural components. In a welding problem, it is quite common that fracture is observed to initiate either directly from the welds or from fatigue cracks that develop in the weld’s heat affected zone (HAZ). A recent study has investigated the effects of subsequent dynamic loading with stationary crack fronts, which assumes load being applied to the structure following the welding process. To analyze these types of problems, a computational procedure based on finite element methodology is developed to integrate the welding residual stresses with subsequent dynamic fracture behavior. The welding analysis is performed with a welding simulation program (SYSWELD). The inclusion of residual stresses and the determination of classical fracture parameters are handled with a specialized finite element program, called FRAC3D. The calculation of energy densities that are recently used in the analysis of cracked structures was shown to be an effective method for the solution of fracture problems. In this paper, a new methodology that is developed to determine local and global energy densities for the simulation of dynamic fracture behavior with initial welding residual stresses is presented.

中文翻译：

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与裂纹结构的焊接残余应力相关的局部和全局能量密度

摘要 考虑到结构部件的可靠设计，与熔焊工艺相关的残余应力最近已成为一个流行的问题。在焊接问题中，观察到断裂直接从焊缝或从焊缝热影响区 (HAZ) 中产生的疲劳裂纹开始是很常见的。最近的一项研究调查了具有固定裂纹前沿的后续动态载荷的影响，其中假设载荷在焊接过程后施加到结构上。为了分析这些类型的问题，开发了一种基于有限元方法的计算程序，以将焊接残余应力与随后的动态断裂行为相结合。焊接分析是通过焊接模拟程序 (SYSWELD) 进行的。残余应力的包含和经典断裂参数的确定是通过称为 FRAC3D 的专用有限元程序处理的。最近用于裂纹结构分析的能量密度计算被证明是解决断裂问题的有效方法。在本文中，提出了一种用于确定局部和全局能量密度的新方法，用于模拟具有初始焊接残余应力的动态断裂行为。