双层复合材料爆炸圆筒内爆载荷作用变形特征数值模拟

Numerical Simulation Analysis of Deformation Characteristics of Double-layered Metal-plastic Cylindrical Shells under Internal Explosive Loading

为研究内爆载荷作用下双层复合材料爆炸圆筒的变形与内外层相互作用的规律,将多层缠绕纤维复合材料等效成一层材料,并将内爆载荷通过载荷曲线的形式施加,提出一个简化的数值计算模型。在模型校核的基础上,利用LS-DYNA软件对同一双层圆筒、不同药量下以及不同内外层厚度比例圆筒在内爆载荷下的变形特征进行分析。结果表明:双层爆炸圆筒壳体在小药量炸药爆炸作用下以弹性呼吸振动为主,随药量增加,金属内衬与外层复合材料会发生分离,外层复合材料在振动过程中会强烈压缩金属内衬,内衬会发生不规则变形,在大药量条件下内衬会被压溃而失去承载能力;相同壳体面密度条件下,过薄的金属内衬在外层复合材料强作用下会过早被压溃,从而失去承载能力,过厚的金属会使得壳体的环向形变增大。研究结果可为双层复合材料爆炸圆筒的设计提供数据参考。

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.