权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Plastic Collapse of Thin-Walled Curved Structures Due to Clashing

薄壁弯曲结构因碰撞而发生塑性倒塌

基本信息

批准号：
01550067
负责人：
ADACHI Tadaharu
金额：
$ 1.22万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550067/
关键词：
Thin-Walled Curved Structure Clash Test Plastic Collapse Energy Absorption Measuring System Crush Mode Dynamic Finite Deformation Analysis Finite Difference Method 衝突式加振台エネルギ吸収特性衝撃荷重加速度計

项目摘要

In the present project, energy absorption of thin-walled curved structures which are basic parts of automobiles, was investigated by experiments and numerical simulations.The experimental techniques of estimating the characteristics of energy absorption for structures was considered. The clash test machine was used in the experiments. The displacements of test pieces were calculated by the procedure of integrating output data from the accelerometer on the impactor, and the impact loads were measured from the load-cell on the impactor. The characteristics of the energy absorptions can be easily estimated from the displacement-load diagrams.The longitudinal impact of thin-&, talled cylinders were experimented to obtain fundamental phenomena of the energy absorptions of the crxish. In these experiments, six kinds of the crush-modes of the cylinders appeared, for example, axial mode, xinaxial modes etc. The mode leaving largest absorption energy is the one when the end of the cylinder folds bacit xrithotit plastic hinges. It is obtained that the displacements of every crxish modes are approximately proportional to absorption energies.The program for the analysis of the tiio-dimensional dynamic elasto-plastic responses has been developed. At the case of nonlinear material or finite deformation problems of structures, the numerical restilts are computed in short time, because the explicit finite difference method without iterative calculations is applied to this program.

本课题以汽车的基本零部件--薄壁曲面结构为研究对象，通过试验和数值模拟，研究了结构吸能特性的试验评估技术。在实验中使用了碰撞试验机。通过对冲击器上加速度计的输出数据进行积分，计算出试件的位移，并通过冲击器上的测力传感器测量冲击载荷。通过对薄壁圆柱体纵向碰撞的实验，得到了碰撞能量耗散的基本现象。实验中出现了轴向、轴向等六种破坏模式，其中吸收能量最大的模式是柱体端部发生屈曲塑性铰时的破坏模式。得到了各阶振型的位移与吸收能近似成正比的结论，并编制了三维动力弹塑性响应分析程序。对于材料非线性或结构有限变形问题，由于程序采用了显式有限差分法，无需迭代计算，计算速度快。