水下爆炸环肋圆筒损伤判据研究

为讨论判据参数对结构损伤程度的评价效果,利用Autodyn软件对典型环肋圆筒结构进行水下爆炸数值模拟研究,得到了圆筒3种损伤模式. 分析了损伤程度与各种判据参数的关系,结果表明:基于峰值超压、比冲量和能流密度的判据参数在不同药量下得到的圆筒损伤程度不一致. 其中,药量对比冲量判据参数的影响最大. 最后,提出药量的幂与爆距的比值作为判据参数一般形式,利用计算结果标定幂指数,得到了受药量影响较小的判据参数,证明了此判据参数形式的合理性.

Research on Damage Criterion of Ring Stiffened Cylinder to Underwater Explosion

To discuss the effects of the damage criterion parameter form, research on numerical methods for the typical ring stiffened cylinder of underwater explosion was conducted in this paper with Autodyn. Three damage modes were calculated including the collapse deformation of the cylinder's part under blasting, the concave deformation in the middle of the cylinder and the fracture of the cylinder. By analyzing the relations between the damage modes and the damage criterion, the research shows that, basing on the criterion parameters of the shock wave overpressure, the specific impulse,the energy flux density and the damage degrees are different with different explosive charge. Especially, explosive charge has the greatest influence on the criterion parameters of the specific impulse. Finally, it is proposed that explosive charge power and the distance ratio are the general forms of the criterion parameters. This criterion parameter form is proved to be reasonable with power index obtained from the simulation results and the criterion parameter obtained with small explosive charge influence.