论文标题
基于自动生成几何形状的离散有限元模型，用于与任意堆叠序列的复合层压板中的损伤演变
An Auto-Generated Geometry-Based Discrete Finite Element Model for Damage Evolution in Composite Laminates with Arbitrary Stacking Sequence
论文作者
论文摘要
复合层压板的刚度降解和进行性失效是涉及纤维裂缝，层内基质裂纹和翼型分配的多模式相互作用的复杂过程。本文提出了一个新的有限元模型，该模型能够在随机上篮的层压板中明确处理此类离散故障。在潜在的裂纹分叉中保证节点的匹配，以确保裂纹尖端附近的正确位移跳跃和裂缝之间的显式负载转移。该模型完全是基于几何的（无网格先决条件），其不同的片段使用基于表面的TIE约束组装在一起，因此不需要元素分区或富集。包括几个数值示例，以证明该模型产生与标本的损伤进化和拉伸强度的实验观察的定性和定量一致的结果的能力。当前的模型在实现具有任意层角和上色的层压板中所有三种类型的失败的同时且准确的耦合方面被认为是独一无二的。
Stiffness degradation and progressive failure of composite laminates are complex processes involving evolution and multi-mode interactions among fiber fractures, intra-ply matrix cracks and inter-ply delaminations. This paper presents a novel finite element model capable of explicitly treating such discrete failures in laminates of random layup. Matching of nodes is guaranteed at potential crack bifurcations to ensure correct displacement jumps near crack tips and explicit load transfer among cracks. The model is entirely geometry-based (no mesh prerequisite) with distinct segments assembled together using surface-based tie constraints, and thus requires no element partitioning or enrichment. Several numerical examples are included to demonstrate the model's ability to generate results that are in qualitative and quantitative agreement with experimental observations on both damage evolution and tensile strength of specimens. The present model is believed unique in realizing simultaneous and accurate coupling of all three types of failures in laminates having arbitrary ply angles and layup.
