Identification of material parameters in constitutive models for metal and metal/polymer composite sheets by elasto-plastic inverse analyzes

通过弹塑性反演分析识别金属和金属/聚合物复合材料板本构模型中的材料参数

基本信息

批准号：
09650105
负责人：
YOSHIDA Fusahito
金额：
$ 1.73万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

The aim of the present research is to propose a new approach for the identification of the mechanical properties of individual component layers of metal or metal/polymer composite sheets by elasto-plastic inverse analyses. The present findings are summarizing as follows :(1) For a bimetallic sheet, a set of material parameters in a constitutive model of cyclic plasticity for individual layer was successfully identified by minimizing the difference between the experimental data (the tensile load vs strain curve in uniaxial tension and the bending moment vs curvature diagram in cyclic bending) and the corresponding results of numerical simulation. The method was verified by comparing the simulated results using the constitutive model incorporating the identified material parameters (eight parameters for each layer, i.e., totally sixteen parameters in an isotropic/kinematic haredening model) with the experimental results on a stainless steel/aluminirn composite sheet.(2) This method was also applied to determine the material parameters for a polymer in a polymer-layer sandwiched aluminium sheeL For that purpose, the experimental data of the transverse shear deformation of the polymer-layer appearing in V-bending experiments was used.Furtheremore, it is worth noting that :- this method has an advantage of using the experimental data for a whole composite sheet but not for individual component layers (the identificationis is possible without performing a time-consuming process of the removal of a layer from the composite sheet).- the identification procedure is based not on the conventional try-and-error approach but on an advanced optimization technique.

本研究的目的是提出一种新的方法，以通过弹性型逆分析来鉴定金属或金属/聚合物复合材料的各个组件层的机械性能。目前的发现总结如下：（1）对于双金属片，通过最小化实验数据之间的差异（在单轴张力和弯曲时刻vs弯曲的曲率图中）和对应于弯曲的弯曲弯曲的弯曲时，成功识别了单个层环状可塑性的一组材料参数。通过使用结合已识别材料参数的本构模型比较模拟结果（每一层的八个参数，即，在各向同性/运动学模型中完全十六个参数）与实验结果上的实验结果来验证该方法。为此目的，使用了出现在V弯曲实验中的聚合物层的横向剪切变形的实验数据，使用了： - 值得注意的是： - 该方法具有用于整个复合层的实验数据的优势，而不是单个组件的组合图（可以识别一个识别材料）（可以识别一定的鉴定过程，都可以使用一定的时间来处理，该过程是符合时间的层面，该过程是符合时间的层面，是对适用的构造的层面，这些层是有效的。过程不是基于常规的尝试方法，而是基于高级优化技术。