【作者】 顾红军；

【导师】 赵国志；

【作者基本信息】 南京理工大学 ， 火炮、自动武器与弹药工程， 2003， 博士

【摘要】 研究多排圆柱壳在爆炸及冲击载荷下的结构响应，是为了系统、准确地描述出多排圆柱壳在这类载荷下的变形行为，确定采用多排钢管构造的吸能结构对爆炸冲击载荷的响应和削弱程度，对爆炸能量的吸收率等；为现代军事防护工程设计提供可靠的依据，解决重大工程难题。但这类问题涉及大变形、非线性、瞬间载荷、藕联因素及复杂约束等，使得求解十分困难。 本文主要讨论了圆柱壳受轴向作用和径向作用两部分内容，通过实验和理论分析建立了单个及多排圆柱壳在爆炸及冲击载荷作用下的变形行为理论体系。 对圆柱壳受轴向载荷作用的讨论，结合采用准静态实验和10kg-5m及10m落锤实验，研究了单个圆柱壳及多排圆柱壳的变形行为、吸收能量机理；由研究知：轴向受压圆柱壳在准静态实验和落锤冲击实验中，其变形行为有明显的一致性；随加载速率提高，应变率效应及材料硬化效应明显。研究中还发现轴向受压圆柱壳折曲边数随径厚比增加有增加趋势，并存在过渡区的新现象；对这一现象，从能量角度给予了解释，并建立了折叠边数判据。结合名义平均压垮载荷的概念，建立了计入应变率强化效应的动态平均压垮载荷计算方法。 对圆柱壳受径向载荷作用的讨论，结合准静态实验、10kg-5m及10m落锤实验、45gTNT爆炸实验和7kgTNT爆炸实验，多角度探讨了单个及多排圆柱壳在径向载荷作用下的变形行为，确定了多排圆柱壳塑性铰生成和发展等规律。建立了多排圆柱壳在爆炸及冲击载荷下的变形模态和塑性铰机构模式。采用模态法进行理论分析，建立了多排圆柱壳在爆炸载荷下的结构响应理论体系。通过研究得到：多排圆柱壳在径向载荷作用下先发生屈服形成四边形，然后再进一步发生四边形屈曲。更多还原

【Abstract】 The study on the structure response of the multi-row cylindrical shells exposed to explosion and shock aims to describe systematically and exactly the deformation of multi-row cylindrical shells and determines the response of an energy-absorbing structure made of multi-row steel pipes to explosion shock, and to what degree the explosion shock is weakened. It is helpful to the reliable design of the modem military protective works and the solution to important problems of works, which usually involves large deformation, non-linearity, instantaneous loading, coupling (interconnection) and complicated constraints.The paper deals chiefly with the axial and radical action of loads on cylindrical shells. Through theoretical analysis and experiments, the theoretical system for the deformation of a single shell and multi-row shells with load is exerted on is set up.With the sum-up of the previous study of a single shell, the discussion on the axial load is focused on the research of the deformation and energy-absorbing mechanism of a single shell and multi-row shells by adopting the quasi-static experiments and the experiment in which 10-kg-hammer drops 10 meters. The research shows that the axial compression cylindrical shells behaves obviously the same in both the quasi-static and hammer-dropping experiments, and that with the rise of loading speed, the strain-rate effect and the material hardening become more obvious. The research also indicates that with the increased ratio of shell’s diameter to the shell wall thickness, the number of the buckling edges of an axially-shocked shell tends to increase and with the appearance of transition zones. The new phenomenon of transition zones is explained from the angle of energy and the criterion of the number of folding edges is established. Combined with the concept of nominal average collapse load, the calculation method for dynamic average collapse load is set up with strain-rate intensifying effect involved.In the discussion on the radical action of load, quasi-static experiment, experiments with 10-kilo hammer dropping 5 and 10 meters and the 45-gram and 7-kilogram TNT explosion experiments are adopted to explore, from different angles, the deformation of a single shell and multi-row shells and determine the formation and development laws of plastic hinges. The deformation modal and mechanism mode of multi-row cylindrical shells under explosion and shock are established. Modal method is used for theoretical analysis to set up a theoretical structure response system of the multi-row shells. Experiments show that the multi-row shells acted on by radical load yield to take a quadrilateral and form quadrilateral buckling.更多还原