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Strain Mapping Analysis Of Textile Composites

机译：纺织复合材料的应变映射分析

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摘要

The focus of the work is meso-scale analysis (scale level of the fabric unit cell) of textile composite deformation and failure. The surface strain measurement is used for: (1) experimental investigation, which includes study of strain distribution at various stages of deformation, plasticity detection, damage initiation; (2) numerical validation of the correspondent finite element (FE) models. Two examples are considered: carbon-epoxy triaxial-braided and glass polypropylene-woven composite. The surface strain measurement (by digital image correlation technique) accompanies the tensile tests, aiming at: (1) elastic anisotropic constants characterisation, (2) study of non-linear material behaviour (for the thermoplastic composite), (3) control of homogeneity of the macro-strain distribution, and (4) analysis of damage initiation in brittle composites. Validation of meso-FE models by strain measurements encounters difficulties arising from (1) resolution of the strain measurements, (2) irregularities of the initial structure such as random layer nesting, ply interaction, and deviation of yarns from their theoretical position, which affects the measured strain fields. The paper discusses these difficulties and demonstrates a qualitative agreement with the FE analysis of idealised composite configurations.
机译：工作的重点是纺织品复合材料变形和破坏的细观尺度分析（织物单位单元的尺度水平）。表面应变测量用于：（1）实验研究，包括研究变形，可塑性检测，损伤萌生各个阶段的应变分布； （2）相应有限元（FE）模型的数值验证。考虑两个例子：碳-环氧三轴编织和玻璃聚丙烯编织复合材料。表面张力测量（通过数字图像相关技术）与拉伸试验同时进行，目标是：（1）弹性各向异性常数表征，（2）非线性材料性能研究（对于热塑性复合材料），（3）均质性控制宏观应变分布的分析，以及（4）脆性复合材料损伤的开始分析。通过应变测量验证中观有限元模型会遇到以下困难：（1）应变测量的分辨率；（2）初始结构的不规则性，例如随机层嵌套，层间相互作用以及纱线与理论位置的偏离，这会影响测量的应变场。本文讨论了这些困难，并与理想化复合材料构型的有限元分析表明了定性的一致性。

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