Manufacturing process would modify the yarn angle of woven composites. To have a high-fidelity mechanical analysis, it is necessary to study its potential impact. In this article, experimental tests were specifically designed and conducted to investigate the influence of yarn angle on the mechanical behaviors of cured woven composites. The results show that yarn angle variation has a significant impact on the elastic modulus, Poisson’s ratio, and yield stress. The tensile deformation along yarn directions and shear deformation between two yarns were also investigated and their coupling with yarn angle variation was analyzed. It shows that when the yarn angle variation (from 90°) is less than 10°, the influence of the tension–shear coupling on the tensile behavior along yarn directions and shear behavior between two yarn directions is small and can be neglected. When the yarn angle variation is more than 20°, the influence of tension–shear coupling is significant and must be accounted for in constructing the constitutive law for the cured non-orthogonal woven composites.

中文翻译：

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纱线角度对固化机织复合材料力学行为的影响分析

制造过程会改变编织复合材料的纱线角度。要进行高保真力学分析，有必要研究其潜在影响。在本文中，专门设计并进行了实验测试，以研究纱线角度对固化机织复合材料机械性能的影响。结果表明，纱线角度变化对弹性模量、泊松比和屈服应力有显着影响。还研究了沿纱线方向的拉伸变形和两根纱线之间的剪切变形，并分析了它们与纱线角度变化的耦合。表明当纱线角度变化（从90°开始）小于10°时，张力-剪切耦合对沿纱线方向的拉伸行为和两个纱线方向之间的剪切行为的影响很小，可以忽略不计。当纱线角度变化超过 20° 时，拉剪耦合的影响显着，在构建固化的非正交编织复合材料的本构律时必须考虑在内。