水中爆炸冲击波对靶体结构的毁伤准则研究

To accurately assess the damage by underwater explosion shock wave to targets, a general form of shock wave damage power parameter Wⁿ/R was derived (W is the mass of the explosive, R is the explosion distance, and n is the coefficient to be determined). Based on the dimensional analysis, a relation between Wⁿ/R and structural damage was deduced, and a general form using Wⁿ/R as the damage criterion for underwater explosion shock waves was proposed. Using software AUTODYN, the effects of shock wave in underwater explosion on circular plate and cylinder were simulated, and the iso-damage curves using different damage power parameters as the damage criterion were compared and analyzed.The results show that shock wave power parameters such as peak pressure, energy flux density (shock factor) and impulse cannot be used independently as damage criterion. When using Wⁿ/R as the damage criterion, the error is significantly reduced, and the mean squared error is only 8%-36% that of other damage criteria. The proposed Wⁿ/R can be regarded as a damage criterion of a combination of both peak pressure and impulse, and the value of n is between 0.333-N_i under different conditions. The criterion has good universality and practicability in evaluating the damage of underwater explosion shock wave to targets.