(西北工业大学 摩擦焊接陕西省重点实验室，西安 710072)
摘 要: 基于ABAQUS/Standard模块，建立TC4线性摩擦焊接过程的二维有限元模型，采用网格重划分与映射技术来处理网格畸变问题，分析线性摩擦焊接接头温度场的演变和轴向缩短量的变化。结果表明：网格重划分与映射技术能较好地解决网格畸变带来的计算不收敛。焊接过程的前0.1 s内，焊接界面温度迅速升高至1 000 ℃以上，之后接头温度渐趋均匀，接头塑性金属开始被挤出形成飞边，轴向缩短量明显增加；摩擦停止时刻(3 s)，单边轴向缩短量达到最大值，约为2.7 mm。
关键字: TC4钛合金；线性摩擦焊；数值模拟；网格重划分
based on ABAQUS software during linear friction welding
（Shaanxi Key Laboratory of Friction Welding Technology,
Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:A two-dimensional numerical model of linear friction welding (LFW) of TC4 titanium alloy was established based on the ABAQUS/Standard software. The remesh and map solution techniques in ABAQUS were employed to cope with the element distortion. The temperature evolution and the change of axial shortening during LFW were examined. The results show that the remesh and map solution techniques can well solve the element distortion, which usually results in an abnormal termination of the calculation. The temperature at the joint interface can reach quickly more than 1 000 ℃ within 0.1 s. After that, the temperature tends to be uniform across the interface and the axial shortening begins to increase obviously accompanying the formation of flash. At the end of friction (3 s), the maximum unilateral axial shortening is about 2.7 mm.
Key words: TC4 titanium alloy; linear friction welding; numerical simulation; remesh
