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）开发弹性塑料材料的静态敏感性分析技术，其在很大变化的薄壁板和壳结构中的发展及其在屈曲约束分化的分化方法中的静态敏感性分析方法是基于Newton-Raphson Iterationerals Iterationerals Iterationerals的静态变形弹性板和外壳结构的很大变形弹性板和壳结构。灵敏度分析技术用于使用近似方法实施有效的优化，在这种方法中，在屈曲约束下，最小重量设计的子问题由Taylor系列扩展构建，并通过二次编程方法解决。通过开发的优化技术实现了圆柱形壳和薄壁板的数值示例。（2）开发动态灵敏度分析技术的发展，在很大程度上变形了薄壁板和壳结构，以及其对休克能吸收问题的应用，其直接差异化方法的动态材料和壳构造的动态分析方法是弹性弹性板的动态敏感性，该方法是壳体结构的，是弹性弹性的弹性构造的，是壳体结构的损害，并构成了壳体结构的侵蚀，并构成了壳体结构的侵蚀，并构成了壳体结构的损害，并构成了壳体结构的侵害。牛顿 - 拉夫森迭代方案。该法式方法应用于最大非线性屈曲载荷和吸收能的敏感分析，以及最大化薄壁壳结构吸收能量的设计。然后，讨论了结构尺寸对吸收能量的影响。用较薄的壁缸对带有缝隙的薄壁缸对能吸收效应进行擦伤实验，并通过实验粉碎，并直接测量吸收能量。然后，研究了缝隙位置的效果和缝隙数。