关键词: 超高压水射流, 空泡溃灭, 冲击波, 微射流

Abstract:

In order to study the failure mechanism of shock waves and micro jets in the fragmentation process of tire under ultra-high  pressure water jet impact, volume of fluid(VOF) model were used to solve the Navier-Stokes equation to simulate the bubble collapse process using FLUENT software. The results show that pressure pulses generated by bubble collapse is greater than the surge pressure caused by micro jets when the jet hits the tread rubber surface. Combined with the crushing tests of tire under ultra-high pressure water jet,grooving sections of tread rubber were observed using scanning electron microscope(SEM) to study the damage mechanism of the micro jets and shock waves.It is observed that rubber materials show obvious impact embrittlement phenomenon under the cavitation damage. Neat pinhole morphologies on the material surfaces are formed by the micro jets and tensile damage of the rubber material is caused by the shock waves.

Key words: ultra-high , pressure , water jet;bubble collapse;shock wave;micro jets