Development of Design Method of Dimensions and Layouts of Thin Walled Plate and Shell Structures Having Maximum Shock Energy Absorption Ability

最大冲击能量吸收能力薄壁板壳结构尺寸与布置设计方法的发展

基本信息

批准号：
05650076
负责人：
YAMAZAKI Koetsu
金额：
$ 1.34万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

(1) Development of Static sensitivity Analysis Technique of Largely Deformed Thin Walled Plate and Shell Structures of Elastoplastic Materials and Its Application to Buckling ConstraintDirect differentiation method of static sensitivity analysis of largely deformed elastoplastic plate and shell structures is formulated for isoparametric shell elements based on the Newton-Raphson iteration scheme. The sensitivity analysis technique is applied to implement the efficient optimization using approximation method, in which a subproblem of minimum weight design under buckling constraints is constructed by the Taylor series expansion and solved by the quadratic programming method. Numerical examples of cylindrical shell and thin walled plate with stiffeners are implemented by the developed optimization technique.(2) Development of Dynamic Sensitivity Analysis Technique of Largely Deformed Thin Walled Plate and Shell Structures and Its Application to Shock Energy Absorption ProblemsThe direct differentiation method of dynamic sensitivity analysis of largely deformed elastoplastic plate and shell structures is formulated for the nine-node shell element based on the Newmark method and the Newton-Raphson iteration scheme. The formulated method is applied to the sensitvity analyzes of maximum nonlinear buckling load and the absorbing energy, and to the maximization design of absorbing energy of thin walled shell structures. Then, the effect of structural dimensions to the absorbing energy is discussed.Crushing Experiment of Energy Absorption Effect by Thin Walled Cylinder with SlitsAluminum cylinders with slits are crushed experimentally, and the absorbing energy is measured directly. Then, the effect of slit location and number of slits are investigated.

(1)弹塑性材料大变形薄壁板壳结构静力敏感性分析技术的发展及其在屈曲约束中的应用基于等参壳单元，提出了大变形弹塑性板壳结构静力敏感性分析的直接微分方法牛顿-拉夫森迭代方案。应用灵敏度分析技术，利用近似法实现高效优化，通过泰勒级数展开构造屈曲约束下的最小重量设计子问题，并采用二次规划方法求解。利用所开发的优化技术，实现了圆柱壳和带加强筋薄壁板的数值算例。(2)大变形薄壁板壳结构动力敏感性分析技术的发展及其在冲击吸能问题中的应用动态直接微分法基于Newmark方法和Newton-Raphson迭代方案，针对九节点壳单元制定了大变形弹塑性板壳结构的敏感性分析。该方法适用于最大非线性屈曲载荷和吸收能的敏感性分析以及薄壁壳结构吸收能的最大化设计。然后讨论了结构尺寸对吸收能量的影响。带狭缝薄壁圆筒吸能效果的破碎实验对带狭缝的铝圆筒进行了破碎实验，直接测量了吸收能量。然后，研究了狭缝位置和狭缝数量的影响。