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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。
In order to deeply understand the fatigue behavior of 3DOWC and improve the anti-fatigue design of the material, the quasi-static three-point bending in warp direction and the three-point bending fatigue at 60% stress were combined with the three-dimensional orthogonal woven composite Experiment and ABAQUS finite element software, a full-scale three-dimensional solid model was constructed. The bending fatigue behavior of the three-dimensional orthogonal woven composite under cyclic loading was studied. The stress distribution and fatigue damage morphology under cyclic loading were obtained. The results show that the warp yarn is the most important bearing component of the material. The middle loading area is the material stress concentration area. The damage is mainly located on the warp yarn at the Z-yarn channel in the stress concentration area. As the cycle increases, Forming a triangle damage area, the research in the composite material design and optimization of guidance.