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Micro-mechanics based damage mechanics for 3D orthogonal woven composites: Experiment and numerical modelling

机译：基于微力学的3D正交编织复合材料的损伤力学：实验和数值模型

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Damage initiation and evolution of three-dimensional (3D) orthogonal woven carbon fibre composite (3DOWC) is investigated experimentally and numerically. Meso-scale homogenisation of the representative volume element (RVE) is utilised to predict the elastic properties, simulate damage initiation and evolution when loaded in tension. The effect of intra-yarns transverse cracking and shear diffused damage on the in-plane transverse modulus and shear modulus is investigated while one failure criterion is introduced to simulate the matrix damage. The proposed model relies on two major assumptions. First, the effect of the binder yarns, on the in-plane properties, is neglected, so the 3DOWC unit cell can be approximated as a (0 degrees/90 degrees) cross-ply laminate. Second, a micro-mechanics based damage approach is used at the meso-scale, so damage indicators can be correlated, explicitly, to the density of cracks within the material. Results from the simulated RVE are validated against experimental results along the warp (0 degrees direction) and weft (90 degrees direction). This approach paves the road for more predictive models as damage evolution laws are obtained from micro mechanical considerations and rely on few well-defined material parameters. This largely differs from classical damage mechanics approaches in which the evolution law is obtained by retrofitting experimental observations. (C) 2016 Elsevier Ltd. All rights reserved.
机译：实验和数值研究了三维（3D）正交编织碳纤维复合材料（3DOWC）的破坏起因和演化。具有代表性的体积元素（RVE）的细观均质化被用来预测弹性特性，模拟在受力时的损伤开始和发展。研究了纱线内部横向裂纹和剪切扩散损伤对平面内横向模量和剪切模量的影响，同时引入了一种破坏准则来模拟基体损伤。建议的模型基于两个主要假设。首先，忽略了粘合纱线对面内性能的影响，因此3DOWC晶胞可以近似为（0度/ 90度）交叉层状层压材料。其次，在中观尺度上使用了基于微力学的损伤方法，因此损伤指标可以明确地与材料内裂纹的密度相关联。相对于沿经线（0度方向）和纬线（90度方向）的实验结果验证了模拟RVE的结果。这种方法为建立更具预测性的模型铺平了道路，因为损伤演化规律是从微观力学考虑中获得的，并且依赖于很少定义的材料参数。这与经典的损伤力学方法大不相同，在经典的损伤力学方法中，通过改进实验观察获得了演化规律。 （C）2016 Elsevier Ltd.保留所有权利。

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