Abstract Three-dimensional (3D) braided composites have broad development prospects in various industries. This paper establishes a real parametric finite element model (FEM) to conduct progressive damage analysis and strength prediction for 3D braided composites. 3D FEM is established with consideration of the cross-section deformations and surface contact of adjacent braiding yarns. Subsequently, 3D Hashin and maximum stress failure criteria are separately implemented as initiation damage criteria for yarn and matrix. Moreover, different damage modes are employed to predict progressive failure process of yarn and matrix. Lastly, the relationship of braiding parameters to strength was thoroughly analyzed and numerical predictions generated which were validated through the experimental data. The results demonstrate that stress–strain curves and strength values are closely related to the braiding angle and the fiber volume fraction. Moreover, damage evolutions show shear bands predominately occur in the surface of yarns for small braiding angles, while for large braiding angles, it mainly occurs in the yarn/yarn interface. The yarn damage for composites of low fiber volume fraction occurs on yarn/yarn junction and then extends to entire yarns, while for high fiber volume fraction, it takes place directly on entire yarns.

中文翻译：

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三维编织复合材料受拉过程中尺度渐进损伤及强度分析

摘要 三维（3D）编织复合材料在各行业具有广阔的发展前景。本文建立了一个真实的参数化有限元模型 (FEM)，对 3D 编织复合材料进行渐进式损伤分析和强度预测。3D FEM 是在考虑相邻编织纱线的横截面变形和表面接触的情况下建立的。随后，3D Hashin 和最大应力失效准则分别作为纱线和基体的初始损伤准则实施。此外，采用不同的损伤模式来预测纱线和基体的渐进破坏过程。最后，彻底分析了编织参数与强度的关系，并通过实验数据验证了数值预测。结果表明应力-应变曲线和强度值与编织角度和纤维体积分数密切相关。此外，损伤演变表明剪切带主要发生在小编织角度的纱线表面，而对于大编织角度，它主要发生在纱线/纱线界面。低纤维体积分数复合材料的纱线损伤发生在纱线/纱线连接处，然后扩展到整根纱线，而对于高纤维体积分数，它直接发生在整根纱线上。