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Progressive damage simulation of triaxially braided composite using a 3D meso-scale finite element model

机译：使用3D中尺度有限元模型的三轴编织复合材料的渐进损伤模拟

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摘要

This article proposes a fully three-dimensional finite element model, developed at the meso-scale level, to predict the progressive damage behavior of a single-layer triaxially braided composite subjected to tensile loading conditions. An anisotropic damage model is established by Murakami-Ohno damage theory to predict damage initiation and progression in the fiber tows. A traction-separation law has been applied to predict theoretically the progressive damage of fiber tow interfaces. The proposed model correlates well with experiment on both global stress-strain responses and local strain distributions. According to the damage contours at different global strain levels, the damage development of fiber tows and interlaminar delamination damage of interface are obtained, explicitly analyzed and correlated with experimental observations. The comparison of model prediction and experimental observations indicate that the model can accurately simulate the damage development of this composite material, i.e. fiber bundle splitting, interaction of free-edge effect and delamination, and final failure of the specimen. This paper also discusses the role of material properties/parameters on the global responses through numerical parameter studies. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文提出了一个在中尺度水平上开发的全三维有限元模型，以预测在拉伸载荷条件下单层三轴编织复合材料的渐进损伤行为。村上大野的损伤理论建立了各向异性损伤模型，以预测纤维束中损伤的发生和发展。牵引分离定律已应用于理论上预测纤维丝束界面的渐进式破坏。所提出的模型与整体应力-应变响应和局部应变分布的实验具有良好的相关性。根据不同的整体应变水平下的损伤轮廓，获得了纤维束的损伤发展和界面层间分层损伤，并进行了明确的分析并与实验结果进行了关联。模型预测和实验观察的比较表明，该模型可以准确地模拟这种复合材料的损伤发展，即纤维束分裂，自由边缘效应和分层的相互作用以及样品的最终破坏。本文还通过数值参数研究了材料特性/参数在整体响应中的作用。 （C）2015 Elsevier Ltd.保留所有权利。

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