论文部分内容阅读
在应变加和分解式的基础上,通过引入相变应变增量描述模型,采用均匀化方法对多相组织力学行为进行描述,构建可以对温度-组织-应力耦合关系进行表征的模型,并将该模型应用于对9Cr1Mo钢管道环焊缝接头焊接残余应力的分析中.结果表明,在数值模拟中,使用三维有限元模型进行计算,计算结果很好的体现了在焊接过程中马氏体相变随热源移动逐渐进行的过程.在对焊接残余应力的表征上,无论是在残余应力沿管道轴向分布的特征,还是在具体的残余应力水平上,三维有限元计算的结果均与实际测量结果取得了较好的吻合.
On the basis of strain addition and decomposition, the phase-strain strain increment description model is introduced and the homogenization method is used to describe the mechanical behavior of the multi-phase structure. The model that can be used to characterize the temperature-tissue-stress coupling relationship is constructed. The model is applied to the analysis of welding residual stress of 9Cr1Mo steel pipe girth weld.The results show that in the numerical simulation, the three-dimensional finite element model is used for calculation, and the calculation results well reflect the martensitic phase In the process of characterization of welding residual stress, the results of three-dimensional finite element calculation are consistent with the actual measurement whether in the feature of axial distribution of residual stress along the pipeline or at the level of specific residual stress The results achieved a good match.