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针对线性摩擦焊基本理论和典型焊接过程,讨论了焊接过程中的摩擦产热机制;依照运动学原理推导了焊接过程的产热方程;采用热力耦合有限元方法建立了焊接过程不同阶段的二维弹塑性有限元计算模型,分别用于工件温度场、应力场及应变场的计算。利用有限元分析软件ANSYS网格重划功能处理了焊接过程中的几何非线性、材料非线性问题,实现了线性摩擦焊金属排出过程的模拟。选取钛合金Ti6Al4V作为试验对象,初步讨论了线性摩擦焊金属排出物的宏观形态及其形成原因。
According to the basic theory of linear friction welding and typical welding process, the mechanism of friction and heat generation in welding process was discussed. The heat production equation of welding process was deduced according to the kinematics principle. The two-dimensional Elastic-plastic finite element model, respectively, for the workpiece temperature field, stress field and strain field calculation. Finite element analysis software ANSYS grid reprogramming function was used to deal with the geometric nonlinearity and material nonlinearity in the welding process and to simulate the linear friction welding metal discharge process. The titanium alloy Ti6Al4V was chosen as the test object to discuss the macroscopic morphology of the linear friction welding metal excretion and its formation reason.