The three dimensional standard damage model developed by Lavedeze et.al [9, 13] for uni-directional fibre reinforced ply is implemented into the nonlinear solution of NX Nastran within composite solid element to analyze the progressive damage process and ultimate failure of fibre reinforced composite laminates. This ply level meso-damage-constitutive-model takes into account main damage mechanisms including fibre breaking, matrix transverse cracking, and fibre/matrix de-bonding; also considers contributions like plasticity coupling, damage delay effects, and elastic nonlinearity in fibre compression. Dissipated energy and damage status are also introduced to reflect the damage condition on the macrostructural-level. Using the implemented code, simulation is carried out on the uniaxial tension of a [±45]2s laminate with IM6/914 material, wherein the predicted ply shear rupture stress matches the experimental results very well and better than the theoretical predictions in literature. Moreover, a [-45/0/45/90] holed laminate loaded in tension is simulated to show the complex behavior of subcritical damage evolution and failure process in the composite structure. The composite solid element with damage model supported in NX Nastran is shown to be a reliable tool to analyze the progressive failure of uni-directional fibre reinforced composite laminates.

中文翻译：

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单向纤维增强复合材料层合板的渐进破坏分析

Lavedeze等人[9，13]开发的单向纤维增强层的三维标准损伤模型被应用到NX Nastran的复合固体单元的非线性解决方案中，以分析纤维增强复合材料的渐进损伤过程和最终破坏层压板。该层水平的细观损伤本构模型考虑了主要的破坏机理，包括纤维断裂，基体横向开裂和纤维/基体剥离。还考虑了诸如塑性耦合，损伤延迟效应以及纤维压缩中的弹性非线性之类的贡献。还介绍了耗散的能量和损坏状态，以在宏观结构级别反映损坏情况。使用执行的代码，对使用IM6 / 914材料的[±45] 2s层压板的单轴张力进行仿真，其中预测的帘布层剪切断裂应力与实验结果非常吻合，并且优于文献中的理论预测。此外，对[-45/0/45/90]开孔的层压板进行了应力模拟，以显示复合结构中亚临界损伤演化和破坏过程的复杂行为。NX Nastran支持的带有损伤模型的复合实体元素被证明是分析单向纤维增强复合材料层压板渐进破坏的可靠工具。