The aim of the present work is to analyze the influence of the mesostructure on the fatigue behaviour of textile composites. By affecting the stress distribution within a laminate, the mesostructure largely determines the damage evolution under cyclic loadings. In this work, plain woven fabrics with different number of layers were tested under cyclic loadings along the warp and weft direction, monitoring the damage evolution. The differences in meso- and micro-structure, together with the position of the bundle in the laminate, affect the fatigue-induced damage mechanisms. The stress fields obtained from 3D Finite Element analyses shed light onto the influence of the mesostructure on the damage onset. Eventually, a stress-based strategy to predict the life to crack initiation is proposed and validated against experimental data.

中文翻译：

---

细观结构对纺织复合材料疲劳行为的影响

目前工作的目的是分析细观结构对纺织复合材料疲劳行为的影响。通过影响层压板内的应力分布，细观结构在很大程度上决定了循环载荷下的损伤演变。在这项工作中，不同层数的平纹机织物在经向和纬向的循环载荷下进行了测试，监测损伤演变。细观和微观结构的差异以及层压板中束的位置会影响疲劳引起的损坏机制。通过 3D 有限元分析获得的应力场揭示了细观结构对损伤发生的影响。最终，提出了一种基于应力的策略来预测裂纹萌生寿命，并根据实验数据进行了验证。