落锤冲击作用下充液半球壳的实验和数值分析

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 148-154.

论文

落锤冲击作用下充液半球壳的实验和数值分析

管文博1，杨会伟1，胡建星1，韩志军1，路国运1

作者信息 +

Numerical investigations into liquid-filled thin hemispherical shells under drop hammer impact

Guan Wenbo1, Yang Huiwei1, Hu Jianxing1, Han Zhijun 1, Lu Guoyun 1

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摘要

采用数值仿真方法对单层内空、单层充液和双层充液不锈钢半球形薄壳在冲击荷载下的动力学响应进行了研究并实验结果进行了比较，验证了数值模拟的有效性。利用验证的模型对落锤冲击三种壳结构的变形模态及其变形特点和能量吸收进行的比对研究。分析发现：内空半球壳在冲击作用下产生镜面反射式的下凹变形，冲击结束后没有明显回弹，壳体横截面没有发生扩展；而对于内充液体的壳体，由于内部液体的作用其反射下凹边缘有了较大的过渡区，在“棱区”边缘伴有向外扩展，如果冲击能量足够，冲头会对镜面反射下凹边缘区产生熨平作用，冲击结束后有明显的回弹。单层内空壳体具有较好的吸能能力，但会使壳体产生较大的顶点位移，极大的压缩了壳内的有效防护空间。双层充液半球壳可以在产生不大的变形情况下吸收较大的冲击能量，并在内壳形成一定的防护空间，而单层充液壳体其吸能及变形情况与双层壳的外壳基本一致。

Abstract

In this paper, numerical simulations are carried out to study the dynamic response of the single-layer empty thin-wall spherical shell, single-layer liquid-filled thin-wall spherical shell and double -layer liquid-filled thin-wall spherical shell under impact loading. These are subjected to impact loading under a drop hammer then the modes and features of deformation are obtained in all the cases. Numerical simulation is carried out by ANSYS and LS-DYNA then deformation and energy absorption of three kinds of spherical shell are obtained. Numerical results show that inward dimpling region of single empty spherical shell is according with mirror reflection under impact loading; Due to effect of the internal liquid, for liquid-filled spherical shell the edge of its inward dimpling region appears larger transition zone and the inward dimpling of liquid-filled spherical shell is according with mirror reflection. If the impact energy is sufficient, the edge of inward dimpling will be ironed by the hammer. Although single-layer empty thin-wall spherical shell has better capability of energy absorption, the vertex displacement of it is larger, so that the effective protection space decreases in it. Double-layer liquid-filled thin-wall spherical shell can absorb most of impact energy with smaller vertex displacement, due to this it can provide satisfying protection in it. Energy absorption and deformation of single-layer thin-wall spherical shell is similar with double-layer liquid-filled thin spherical shell.

导出引用

管文博;杨会伟;胡建星;韩志军;路国运. 落锤冲击作用下充液半球壳的实验和数值分析[J]. 振动与冲击, 2014, 33(21): 148-154

Guan Wenbo;Yang Huiwei;Hu Jianxing;Han Zhijun;Lu Guoyun . Numerical investigations into liquid-filled thin hemispherical shells under drop hammer impact[J]. Journal of Vibration and Shock, 2014, 33(21): 148-154