超声波的传播特性及其对钎料润湿行为的影响

Propagation characteristic of ultrasonic in Al MMCs and its effect on wetting behavior of liquid filler

通过ANSYS有限元数值模拟和试验相结合,研究了超声波在固态试件及钎料液滴中的传播特性.结果表明,试件表面的声振动分布不均匀,沿传播方向振幅先增大后减小,再增大,各个峰值位置的间隔约为10 mm.当加载振幅增大时,试件表面上同一位置的振幅也随之变大,且大于所加载的超声波的振幅,但位移场的分布规律不变,表面质点保持着与超声频率相近的振动.钎料液滴内部的声压值随着试件表面振动的增大而增大,当加载振幅超过7.5μm后,钎料液滴内部的声负压值均可达到数万帕.试验观察结果较好地验证了有限元模拟的结果.

The propagation characteristic of ultrasonic in the solid substrate and the filler droplet was investigated by using finite element simulation and experimental test.The results show that the ultrasonic vibration of the substrate surface is non-uniform.The ultrasonic vibration amplitude along the spreading direction first increases,and subsequently decreases before a final increase.The space of each peak amplitude location is approximately 10 mm.As the input ultrasonic vibration increases,the particle displacement of the substrate surface increases and is larger than that of the input value.The displacement field remains unchanged and the particle vibrates at a frequency similar to that of the input load.The acoustic pressure in the filler droplet increases with the displacement of substrate surface,which reaches ten thousands of pascals when the input ultrasonic load is higher than 7.5 μm.The finite element simulation results are consistent well with the experimental observations.