Dynamic response of double ring-stiffened cylindrical shell structure collided by multiple bodies
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摘要: 针对双层环肋圆柱壳受到多个物体的撞击问题，采用MSC.Dytran软件对受撞过程中的结构损伤变形、撞击力变化和能量转换进行数值模拟，并与模型试验相对比后发现：双层环肋圆柱壳结构同时受多物体撞击是一个瞬态动响应过程，在巨大瞬时冲击载荷作用下，受撞区壳板会迅速超越弹性变形而产生塑性变形；多物体撞击会造成外壳板一定区域的损伤变形，撞击力会相互干扰，导致其非线性特征更明显。结果表明，双层圆柱壳的外壳能对内壳起到较好的防护作用，在外壳没被撞穿的情况下，其结构变形会吸收绝大部分的撞击动能，可以通过优化外壳的吸能效率来达到双层壳体结构物内壳防撞的目的。Abstract: Aiming at solving the problem of the double ring-stiffened cylindrical shell structure collided by multiple bodies, a numerical simulation and a dynamic model test were carried out to explore the structural deformation, the impact force change and the energy conversion by using MSC.Dytran. Compared with the model tests, it is found that the double ring-stiffened cylindrical shell impacted by multiple bodies is a transient dynamic response process. Under enormous impact loading, shell plates in collision region will quickly generate plastic deformation; the shell impacted by multiple bodies will result in a damage to a certain degree; the impact forces will interfere with each other and then lead to the nonlinearity becoming even more significant. The results show that the external shell of the double ring-stiffened cylindrical shell can provide a better protection for the inner shell. The deformation of the structure will absorb most of the impact energy. So by optimizing the external shell's energy-absorbing efficiency a better protection against the impact can be achieved.
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图 1 不同网格特征长度数值模拟结果对比
Figure 1. Comparison of calculation results between different element lengths
图 2 双层环肋半圆柱壳结构和撞击物有限元模型
Figure 2. Finite element models of double ring-stiffened cylindrical shell structure and colliding bodies
表 1 模型结构特征参数
Table 1. Parameters of the model's structural characteristics
R1/t1 $L_{1} / \sqrt{R_{1} t_{1}}$ F1/L1t1 R2/t2 $L_{2} / \sqrt{R_{2} t_{2}}$ F2/L2t2 363.3 4.2 0.25 153.3 1.62 0.56 
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