Finite element simulation of 3D orthogonal woven composites under low cycle bending fatigue loading
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摘要: 为了深入理解三维正交机织复合材料（3DOWC）疲劳性能，改进材料抗疲劳设计，结合三维正交机织复合材料试样经纱方向准静态三点弯曲及60%应力水平下的三点弯曲疲劳实验与ABAQUS有限元软件，构建了全尺寸三维实体模型，研究了三维正交机织复合材料在低周循环载荷下的弯曲疲劳性能，经分析得到循环加载下模型应力分布情况和疲劳损伤形态。结果表明：经纱为材料最重要的承载部件，中间加载区域为材料应力集中区，损伤主要位于应力集中区的Z纱通道处的经纱上，随着循环增加，逐渐在中心加载区域的上部和下部形成三角形损伤区域，该研究在复合材料设计与优化中具有指导意义。Abstract: In order to better understand the fatigue behavior of 3D orthogonal woven composites (3DOWC) and improve the fatigue resistance behavior of material, the bending fatigue property under low cycle load was studied, which combined quasi-static three-point bending test and the cyclic bending test under 60% stress levels of 3DOWC with the ABAQUS finite element software that construct whole-scale 3D solid model. The distribution of stress, fatigue damage shape of the 3DOWC were obtained. It is found that the warp yarn is the most important load bearing part, the stress concentration area is in the middle of loading area, and damage occurs mainly in warp yarn that closes to Z-yarns channels.Triangle damage area is formed up and down gradually in the middle of loading area with increasing cycle load. This study may give guidance for future design and optimization of composites.
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