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采用沿经向切片积分的方法计算2.5维机织复合材料的宏观经向拉伸弹性模量,与试验结果和传统的体积平均合成方法进行了对比,分析表明,本文中的方法能够有效提高传统体积平均法的预测精度。利用文中的方法分析了2.5维机织复合材料沿在机织循环过程中的经向拉伸弹性模量分布情况,并且对相关机织结构的2.5维机织复合材料进行了试验研究。研究发现,经纱弯曲程度较小的直联结构和添加平直经纱的衬经结构能够有效提高2.5维机织复合材料的经向拉伸弹性模量,并且能够改善经向拉伸应力-应变曲线的非线性。
Comparing with the experimental results and the traditional volume average synthesis method, the macroscopic tensile elastic modulus of 2.5-dimensional woven composite material is calculated by the method of integral integration in the meridional direction. The analysis shows that the method in this paper can effectively improve the traditional Prediction accuracy of volume average method. In this paper, the distribution of warp tensile modulus of 2.5D woven composites along the weaving cycle was analyzed. The 2.5D woven composites with relevant woven structure were also studied. It is found that the direct-coupled structure with less warp warp and the lining structure with plain warp yarns can effectively increase the MD tensile modulus of 2.5-dimensional woven composites and can improve the tensile-stress-strain curves Non-linearity.