论文部分内容阅读
为了预测非屈曲织物增强复合材料的力学性能,建立了纤维束的正六边形单胞和非屈曲织物复合材料的长方形单胞,并重点推导了正六边单胞的方程边界条件。通过跨尺度逐级计算这两个单胞的有效弹性常数,得到了非屈曲碳纤维织物增强环氧树脂基复合材料的宏观有效弹性性能和强度。对该非屈曲织物复合材料在拉伸载荷下的累计失效进行了有限元损伤分析。结果表明:初始损伤发生在富树脂区或横向纤维束,损伤在富树脂区与横向纤维束内逐步扩展,最后向纵向纤维束扩展并迅速导致整体失效;非屈曲织物增强复合材料的面内拉伸模量的计算预测值非常接近实验值,面内拉伸强度计算值略小于实验值。
In order to predict the mechanical properties of non-buckled fabric-reinforced composites, the rectangular unit cell of the hexagonal unit cell and non-buckled fabric of fiber bundle was established and the boundary conditions of the hexagonal unit cell were deduced emphatically. By calculating the effective elastic constants of these two unit cells step by step, the macroscopic effective elastic properties and strength of non-buckling carbon fiber reinforced epoxy resin matrix composites were obtained. Finite element damage analysis was conducted on the cumulative failure of the non-buckled fabric composite under tensile load. The results show that the initial damage occurs in the resin-rich region or the transverse fiber bundles, the damage gradually expands in the resin-rich region and the transverse fiber bundles, and finally expands to the longitudinal fiber bundles and quickly leads to overall failure. The non-buckling fabric enhances the in-plane pull of the composite The predictive value of tensile modulus is very close to the experimental value, the in-plane tensile strength calculated value is slightly less than the experimental value.