TA2/1060铝双金属管爆炸焊接数值模拟

Numerical Simulation of Explosive Welding of TA2/1060 Aluminum Bimetallic Tubes

目的为探究炸药爆速对复合管结合质量的影响,以及SPH-FEM法和拉格朗日法对爆炸焊接数值模拟的差异。方法利用ANSYS/LS-DYNA软件,建立钛/铝双金属管爆炸焊接模型,分别采用SPH-FEM耦合法和拉格朗日法对不同爆速下的TA2/1060铝双金属管进行爆炸焊接数值模拟。结果结合复管的最佳碰撞速度、碰撞压力和基复管的塑性变形情况可知,要获得结合质量较好的复合管,炸药爆速应设置在1950~2150m/s;SPH-FEM法计算的特征单元碰撞速度与理论值误差分别为0.78%、1.2%和1.4%,由拉格朗日算法计算的特征单元碰撞速度与理论速度之间误差分别为5.4%、5.8%和2.7%。结论塑性变形和复管碰撞速度过小或过大均不能实现良好结合;钛/铝双金属管爆炸焊接的最佳炸药爆速范围为1950~2150m/s;拉格朗日法的前期建模较为简洁,模拟过程中SPH-FEM法耗时较多但该方法对动态参数模拟的精确度较高。

Objective To investigate the effect of explosive detonation velocity on the bonding quality of composite pipes and determine a reasonable range of explosive detonation velocity;And the difference between SPH-FEM algorithm and Lagrange algorithm in numerical simulation of explosive welding.Methods A titanium/aluminum bimetallic tube explosion welding model was established using ANSYS/LS-DYNA software.The SPH-FEM algorithm and Lagrange algorithm were used to numerically simulate the explosion welding of TA2/1060 aluminum bimetallic tubes at different detonation velocities.Results According to the optimum impact velocity,impact pressure and plastic deformation of the composite pipe,the explosive detonation velocity should be set between 1950~2150 m/s to obtain the composite pipe with good bonding quality The errors of collision velocity and theoretical value calculated by SPH-FEM algorithm are 0.78%,1.2%and 1.4%,the errors between the collision velocities calculated by the Lagrange algorithm and the theoretical velocities are 5.4%,5.8%and 2.7%,respectively.Conclusion The Best Explosive Velocity Range is 1950~2150m/s for explosive welding of Ti/AL bimetallic tubes The Lagrange algorithm is simple and time-consuming,but the SPH-FEM algorithm has high accuracy in dynamic parameter simulation.