炸药量对双层圆管爆炸焊接影响的数值模拟

Simulation for the influences of explosive amount on explosive welding of two-layer tubes

为研究炸药量对爆炸焊接过程的影响,并优化双层圆管结构爆炸焊接工艺.采用ANSYS/LS-DYNA软件建立钢-铜双层圆管爆炸焊接三维有限元模型,在对模型进行可靠性验证的基础上,研究炸药量对结合界面、覆管所受压力及其运动速度和动能的影响规律.结果表明:炸药量对基覆管产生的变形量及覆管速度影响极大,变形量和覆管速度过小均不能实现良好结合。覆管所受压力及其速度和动能在爆炸瞬间急速增大,与基管碰撞后急速减小并趋近于0,据此可判断爆炸复合管的质量.

To understand the process of two-layer tube explosive welding, a 3D finite element model of the explosive welding of steel-copper two-layer tubes is established on the platform of ANSYS/LS-DYNA. This model is utilized to investigate the influences of explosive dosage on bonding interface, pressure on the flyer tube and its velocity and kinetic energy after being verified. Results show that if the pressure on the flyer tube and its velocity are not enough in case of too little explosive, the flyer tube could not obtain necessary kinetic energy for bonding. The pressure, kinetic energy and velocity increase rapidly when the colliding happens, and decrease rapidly to zero after the collision.