Influence of External Conditions on Implosion Shock Wave of Hollow Structure

The hollow structure working in deep water is subjected to huge hydrostatic pressure. When it is suddenly crushed, it will explode and generate shock waves, and cause damages to the surrounding structure. Aiming at the problem that the implosion shock wave is affected unclearly by hydrostatic pressure and vacuum volume, the underwater implosion test of photomultiplier tube (PMT) was carried out. It was verified that the CEL coupling calculation method in ABAQUS satisfies the requirements of PMT implosion simulation accuracy, and then the effects of external hydrostatic pressure and vacuum volume of hollow structures on implosion shock waves were analyzed by simulation. The results show that with the increase of hydrostatic pressure and vacuum volume, the peak value of the shock wave increases linearly, and the farther away from the implosion center, the slower the increase of peak value of the shock wave. The pulse width of the shock wave remains basically unchanged with the increase of hydrostatic pressure, and decreases slowly with the increase of vacuum radius.