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首页> 外文期刊>Composites Science and Technology >Assessing 3D shear stress-strain properties of composites using Digital Image Correlation and finite element analysis based optimization
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Assessing 3D shear stress-strain properties of composites using Digital Image Correlation and finite element analysis based optimization

机译：使用数字图像相关性和基于有限元分析的优化评估复合材料的3D剪应力-应变特性

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This work presents a method which uses the full-field measurement capability of Digital Image Correlation (DIC) for a simultaneous assessment of non-linear shear stress-strain relations for composites in all three principal material planes. The method, which employs a small rectangular plate torsion specimen, advances our ability to measure 3D material properties compared to the previous methodology that was able to use only small regions of the specimen surfaces in the material characterization. The new methodology takes full advantage of the full-field measurement. Material stress strain constitutive modeling is relying on the DIC data including the in-plane as well as out-of-plane strain components; and on iterative finite element model (FEM) updating based on the Levenberg-Marquardt algorithm for minimization of weighted least squares error between the DIC-measured and the FEM-predicted strains. Results include the in-plane and two interlaminar stress strain curves simultaneously captured for a practical carbon/epoxy tape material system. (C) 2015 Elsevier Ltd. All rights reserved.
机译：这项工作提出了一种方法，该方法利用数字图像相关性（DIC）的全场测量功能来同时评估所有三个主要材料平面中复合材料的非线性剪切应力-应变关系。与以前的方法相比，该方法使用了一个小的矩形板扭转试样，从而提高了我们测量3D材料特性的能力，而以前的方法只能在材料表征中使用试样表面的小区域。新方法充分利用了全场测量的优势。材料应力应变本构模型依赖于DIC数据，包括面内和面外应变分量。并基于Levenberg-Marquardt算法更新迭代有限元模型（FEM），以最小化DIC测得的应变与FEM预测的应变之间的加权最小二乘误差。结果包括针对实际的碳/环氧树脂带材料系统同时捕获的面内应力和两个层间应力应变曲线。 （C）2015 Elsevier Ltd.保留所有权利。

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