Research on damage criterion of torpedo shell subjected to underwater explosive shock waves

Damage criterion of torpedo shell subjected to underwater explosion is researched. A damage criterion is proposed according to the general form of the characteristic parameters of underwater explosive shock wave. A damage criterion method which is based on “0-1” probability distribution function is proposed. For 1:2 ring stiffened cylinder scale model of heavy torpedo, the undersea explosion experiments of torpedoes with different charge masses are done. The quantitative criterion of heavy torpedo shell damage is obtained through similarity transformation of scale model. The peak overpressure and specific impulse threshold values of each damage level are analyzed based on this criterion. The results show that the threshold of peak overpressure decreases with the increase in charge mass under the same damage grade, and the threshold of specific impulse increase; and the smaller the charge is, the greater the change amplitudes of the two threshold values are.