Abstract High velocity impact response of quasi-isotropic carbon fiber reinforced polymeric laminates cured from unidirectional plies is studied using finite element models. Rigid steel spheres are used as projectiles. The intraply meso-model originally proposed by Ladeveze (LMT-Cachan) for the ply behavior based on continuum damage mechanics, is extended in this paper to take into account ply fracture energies and in-situ strengths. Constitutive modeling relies on mesh size regularization (via Bazant-type crack-band/smeared-crack formulation), orthotropic material aligned mesh and element erosion. Three different types of post-peak degradation strategies are considered and compared in the paper: (a) damage rate bound model, and smeared-crack formulation based (b) linear and (c) exponential softening laws. Models (b) and (c) are original contributions. Intraply and interply damage models are implemented via user routines in LS-Dyna, for explicit dynamic analyses. The efficiency of the novel material models to predict high velocity impact response and to mitigate the mesh size effects is studied. Predictions from the developed models are validated by comparing with test data and numerical results from the literature, and demonstrated that the two new models based on smeared-crack formulation provide accurate results.

中文翻译：

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使用改进的中尺度损伤模型的复合材料层压板的高速冲击响应

摘要 使用有限元模型研究了由单向层固化的准各向同性碳纤维增强聚合物层压板的高速冲击响应。刚性钢球用作弹丸。Ladeveze (LMT-Cachan) 最初为基于连续损伤力学的层行为提出的层内细观模型在本文中进行了扩展，以考虑层断裂能和原位强度。本构建模依赖于网格尺寸正则化（通过 Bazant 型裂纹带/涂抹裂纹公式）、正交各向异性材料对齐网格和元素侵蚀。本文考虑并比较了三种不同类型的峰值后退化策略：(a) 损伤率边界模型，以及基于 (b) 线性和 (c) 指数软化定律的涂抹裂纹公式。模型 (b) 和 (c) 是原始贡献。Intraply 和 Interply 损伤模型通过 LS-Dyna 中的用户程序实现，用于显式动态分析。研究了新型材料模型在预测高速冲击响应和减轻网格尺寸效应方面的效率。通过与试验数据和文献中的数值结果进行比较，验证了开发模型的预测，并证明了基于涂抹裂纹公式的两个新模型提供了准确的结果。