爆炸焊接参数对钽/304不锈钢界面波形影响的数值模拟

为了研究爆炸焊接参数对界面波形的影响，对钽/304不锈钢的爆炸焊接进行了二维数值模拟，模拟得到了不同碰撞角和碰撞速度的界面波。由输出模拟界面处波形图可观测到钢在爆轰过程中被拉长且在涡旋处强烈弯曲；测量波的波长以及波幅发现，当碰撞速度一定时，比波长由小到大依次为碰撞角12.2°、碰撞角14.1°、碰撞角16.4°；碰撞角一定时，碰撞速度为633 m/s界面波长和波幅小于碰撞速度为735 m/s时的界面波长和波幅；速度水平方向的数值大小与波长数值的大小一致性较好，速度竖直方向的数值大小与波幅数值的大小一致性较好。结果表明，结合界面处和界面附近的钢侧均发现了明显的解理断裂特征；界面处比波长与碰撞角呈正相关；碰撞速度越大，界面波长和波幅也越大；速度水平方向的分量决定波长数值的大小，速度竖直方向的分量决定波幅数值的大小。 创新点： (1)结合光滑粒子流体动力学方法,采用单参数变化方法研究碰撞角和碰撞速度对界面波形的影响。 (2)研究了速度的水平分量以及竖直分量对界面波形的影响。

Numerical simulation of influence of explosive welding parameters on interface waveform of tantalum/304 stainless steel

In order to study the influence of explosive welding parameters on the interface waveform, the two-dimensional numerical simulation of explosive welding was used in this paper.The numerical simulation of tantalum/304 stainless steel was carried out, and the interface waves under different collision angles and collision speeds were obtained. By outputting the waveform diagram at the simulation interface, it can be observed that the steel is elongated and strongly bent at the vortex in the detonation process. The wavelength and amplitude of the wave are measured, and it is found that when the collision velocity is constant, the specific wavelength at the collision angle of 12.2° < the specific wavelength at the collision angle of 14.1°< the specific wavelength at the collision angle of 16.4°; when the impact angle is fixed, the interface wavelength and amplitude at the impact velocity of 633 m/s are smaller than those at the impact velocity of 735 m/s; the numerical value in the horizontal direction of velocity is in good agreement with the wavelength value, and the numerical value in the vertical direction of velocity is in good agreement with the amplitude value. The results show that obvious cleavage fracture characteristics are found at the interface and the steel side near the interface. The specific wavelength at the interface is positively correlated with the collision angle; the greater the collision speed, the greater the interface wavelength and amplitude; the horizontal component of velocity determines the wavelength value, and the vertical component of velocity determines the amplitude value. Highlights: (1)Effect of collision angle and velocity on interface waveform is studied by combining smooth particle hydrodynamics method and using single parameter variation method. (2)The influence of horizontal component and vertical component of velocity on interface waveformare studied.