炸药量对爆炸焊接界面波影响的数值模拟

Research of explosive charge impact on explosive welding interface wave

为了保证金属复合材料的爆炸焊接质量,对爆炸焊接过程中的爆轰荷载大小起着决定性作用的炸药量及布药方式进行了探索。应用AUTODYN非线性显式动力学分析软件,模拟了基、复板爆炸焊接复合过程,得到了不同炸药量下爆炸焊接过程中的压力时程,结合理论公式,分析炸药量、爆轰荷载、碰撞速度和界面波状之间的关系,及炸药量对爆炸焊接界面波的影响。并在复板上、下表面等间距各设置了8个关键点,比较了炸药厚度均匀布药方式和厚度递减布药方式产生的波状形态。结果表明,在可焊性窗口内,炸药量多的会产生较大波状结合界面;厚度递减布药方式能够消除均匀布药方式下界面波的不均匀现象,其中方案2的速度波动效果最好。并且已经结合的界面受到后续压力的振动破坏明显降低。

The charge and distribution of explosives are the decisive factor for the detonation load during the explosive welding process, which has a crucial influence on the interfacial wave of the base composite plate further. In this paper, AUTODYN nonlinear explicit dynamics analysis software is used to simulate the composite process of explosion and welding of the base composite plate, and the pressure curves in the explosive welding process under different charge of explosives are obtained.Combining with theoretical formulas, the relation among explosive charge, detonation load and collision velocity is analyzed,and the influence of the amount of explosive on the interface wave of explosion welding is studied. And set 8 key points on the upper and lower surfaces of the board, the wavy morphology produced by the uniform thickness of explosives and the method of decreasing thickness is compared. The results show that a large charge of explosives will produce a large wave bonding interface in the weldability window; the decreasing thickness of the explosive distribution can eliminate the inhomogeneity of the combined interface wave under the uniform dispensing method, and the vibration damage of the bonded interface under subsequent pressure is significantly reduced.