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首页> 外文期刊>Engineering Fracture Mechanics >Fracture behaviour of triaxial braided composites and its simulation using a multi-material shell modelling approach
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Fracture behaviour of triaxial braided composites and its simulation using a multi-material shell modelling approach

机译：三轴编织复合材料的断裂行为及其使用多材料壳建模方法模拟

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The translaminar fracture response of triaxial braided composites was analysed by means of Compact Tension tests. Different values of critical strain energy release rate for fracture along the main material directions were estimated by applying two different data reduction methods to the experimental results. The fracture mechanisms were analysed to provide physical justification for such anisotropic behaviour. Possible laminate thickness effects were studied but judged to have negligible impact in the fracture toughness of these materials. A numerical methodology based on a Multi Material Shell approximation is proposed to simulate fracture of triaxial braided composites. The modelling approach is based on the discretization of the braiding architecture at the Gauss point level of standard shell elements including the corresponding yarn geometrical parameters. At constitutive level, Continuum Damage Models were used to simulate independently the brittle orthotropic yarns and the elasto-plastic isotropic resin matrix. This approach was validated by correlation between simulations of the Compact Tension tests and the corresponding experimental results. In spite of the modelling simplifications, the remarkable results achieved reveal an efficient virtual testing approach that can be used for the analysis fracture of triaxial braided materials at structural level. (C) 2017 Elsevier Ltd. All rights reserved.
机译：通过紧凑的张力试验分析三轴编织复合材料的转音轴断裂响应。通过将两种不同的数据减少方法施加到实验结果，估计沿着主要材料方向沿主要材料方向沿着主要材料方向的临界应变能量释放速率的不同值。分析断裂机制以提供这种各向异性行为的物理理由。研究了可能的层压材料厚度效应，但判断在这些材料的断裂韧性中具有可忽略不计的影响。提出了一种基于多重材料壳近似的数值方法来模拟三轴编织复合材料的骨折。建模方法基于标准壳元件的高斯点级的编织架构的离散化，包括相应的纱线几何参数。在组成型水平下，使用连续损伤模型独立地模拟脆性正向纱线和弹性塑料各向同性树脂基质。通过紧凑张力试验的模拟与相应的实验结果之间的相关性验证这种方法。尽管简化了建模，但实现了显着的结果，揭示了一种有效的虚拟测试方法，可用于结构水平的三轴编织材料的分析骨折。 （c）2017 Elsevier Ltd.保留所有权利。

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