The dynamic axial crushing response of circular tubes made of unidirectional carbon fiber‐epoxy composite was investigated numerically applying a new approach to the modeling of the delamination process. In the proposed approach, delamination (interface damage) was modeled by inserting isotropic resin plies capable of damage. They are tied to the adjacent laminae and replace the commonly used surface‐based cohesive model. Two multi‐layer models of laminated tubes having cross‐ply and angle‐ply stacking sequences were simulated using stacked conventional shell elements layers to capture the crushing response and intralaminar and interlayer damage of laminated tubes. The progressive failure analysis in Abaqus/Explicit was utilized to model the successive damage of both the interface and laminae. Both the intralaminar layers and isotropic resin layers were modeled by the conventional reduced integration shell element (S4R). The suggested modeling technique offers some advantages compared to the main‐stream interface modeling of the axial impact of laminated tubes. The computational cost is reduced and yet accurate predictions are obtained. The FE models based on the proposed delamination approach were validated by experimental test results obtained by the authors for cross‐ply and angle‐ply tubes subjected to a low‐velocity impact.

中文翻译：

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低速轴向冲击下碳纤维增强复合材料管的有限元建模

数值研究了单向碳纤维-环氧树脂复合材料制成的圆管的动态轴向挤压响应，并将其应用到分层过程建模的新方法中。在提出的方法中，分层（界面损坏）是通过插入能够损坏的各向同性树脂层来建模的。它们与相邻的薄片捆绑在一起，并取代了常用的基于表面的内聚模型。使用堆叠的常规壳单元层模拟了具有交叉层和角度层堆叠序列的两个多层管模型，以捕获层管的压溃响应以及层内和层间损伤。利用Abaqus / Explicit中的渐进式失效分析法对界面和薄片的连续破坏进行建模。层内层和各向同性树脂层均通过常规的减少集成壳单元（S4R）进行建模。与主流界面对层压管轴向冲击的建模相比，建议的建模技术具有一些优势。减少了计算成本，但仍获得了准确的预测。作者通过针对低速冲击的交叉层和角度层管获得的实验测试结果验证了基于所提出的分层方法的有限元模型。