英语翻译2.5 Solving ProcedureSince the RSW is a complex process

英语翻译
2.5 Solving Procedure
Since the RSW is a complex process that involves thermal,electrical,and mechanical properties,an incremental coupled FE model has been adopted using APDL with ANSYS commercial software.The proposed algorithm of the FE model is illustrated in Fig.2.The contact elements used in the FE model are presented in Fig.1,and Table 2 presents the number of nodes and the nature and degrees of freedom at each node.Mesh-sensitivity analyses are performed with various elements,and the results are included in Table 3.Maximum temperature and nugget dimension are chosen as the main criteria for validations.The values of the correct elements have been chosen based on these two criteria.Owing to the nature of the problem,a nonlinear procedure is suggested to solve the problem.The first step in the welding process is the squeezing cycle.In this step,only electrode force is applied to the model,and structural elements are used for initial mechanical analysis to determine the initial deformations and contact area.In the welding cycle,electrical current is applied to the top surface of the upper electrode.By means of thermal-electrical elements,the heat generation is calculated for an increment from the fully coupled model.

2.5解决程序
由于RSW（电阻点焊）是一个复杂的过程,它涉及到热学、电学和机械的性质,所以已经使用APDL与ANSYS商业软件采纳了一个增量耦合有限元模型.这一提出的有限元模型的算法示于图 2.用于有限元模型中的接触元被示于图 1中,而表2列出了节点的数目,以及每个节点处的性质和自由度.用各种元进行了网格敏感度分析,其结果归纳在表3中.最高温度和熔核尺寸被选择作为用于验证的主要判据.已经基于这两个判据选择了正确的元的值.由于该问题的性质,推荐了一个非线性程序来解决这一问题.在焊接过程中的第一步是在挤压周期.在此步骤中,只有电极的力施加到所述模型,而结构元被用于初始的机械分析,以确定初始变形和接触区域.在焊接周期中,电流施加到上部电极的上表面.利用热 - 电元,计算来自于所述完全耦合模型的增量产生的热.