316L不锈钢/CK22碳钢爆炸焊接管的数值模拟

Numerical simulation of 316L stainless steel/CK22 carbon steel explosive welding pipe

为研究不同炸药量对爆炸焊接不锈钢316L/碳钢CK22复合管的影响,采用ANSYS/LS-DYNA软件结合ALE流固耦合算法对不同炸药内径下复合管的爆炸焊接过程进行数值模拟,建立316L/CK22双金属管可焊接窗口,利用后处理软件LS-PrePost导出焊接过程中碰撞压力、塑性变形、碰撞速度等动态参数。结果表明:炸药厚度小于0.505 cm时碰撞速度在可焊接窗口外,在复合时发生回弹焊接失败,药厚大于0.505 cm时均能较好复合,模拟与实验吻合,证明焊接窗口对爆炸焊接实验的较好指导意义;模拟碰撞速度与理论值误差在3.2%~9.5%,证明数值模拟爆炸焊接复合管的可靠性。

In order to study the effect of different explosive amounts on explosive welding of stainless steel 316L/carbon steel CK22 composite pipe,ANSYS/LS-DYNA software and ALE fluid-structure coupling algorithm were used to simulate the explosive welding process of composite pipe under different explosive inner diameters,and the weldable window of 316L/CK22 bimetallic pipe was established.The post-processing software LS-PrePost was used to derive the dynamic parameters such as impact pressure,plastic deformation,collision velocity during the welding process.The results show that the impact velocity is outside the weldable window when the explosive thickness is less than 0.505 cm,and the rebound welding failure occurs when the explosive thickness is greater than 0.505 cm.The simulation is consistent with the experiment,which proves that the welding window has a good guiding significance for the explosive welding experiment;The error between the simulated collision velocity and the theoretical value is between 3.2%and 9.5%,which proves the reliability of the numerical simulation of explosive welding of composite pipes.