双层复合材料爆炸圆筒内爆载荷作用变形特征数值模拟

In order to study the deformation of double-layered composite cylinder and the law of interaction between inner and outer layers under internal explosive loading, a simplified numerical calculation model is proposed, in which the multi-layered wound fiber composite material is equivalent to a single-layered material and the internal explosive loading is applied in the form of a load curve. Based on the model check, LS-DYNA is used to analyze the deformation features of the same double-layered cylinder with different doses and different thickness ratios of inner and outer layers under internal explosive loading. The results show that the vibration of double-layered explosive cylinder shell is mainly an elastic breathing vibration under the effect of small-dose explosive. As the dose increases, the metal liner separates with the outer composites. The outer composites compress strongly the metal liner during vibration. The metal liner can become deformed, and it will be crushed and lose its bearing capacity under large dose. Under the same shell surface density, the thin metal liner is prematurely crushed under the strong effect of the outer composites and loses its bearing capacity while the extremely thick metal can increase the circumferential deformation of shell.