论文部分内容阅读
建立了两种组合梁模型,分别模拟3D机织复合材料内部和表面纤维束的细观结构,模型反映了纤维束细观结构和变形的周期性,考虑了纤维束的局部弯/剪耦合效应和局部偏轴效应。实验确定了一种树脂基体各向同性蠕变本构的参数,在此基础上建立了纤维束横观各向同性的蠕变本构模型,将基体和纤维束的蠕变本构应用于上述细观组合梁模型,用于分析3D机织复合材料宏观平均的黏弹性应力-应变响应。用上述模型分析了一种环氧树脂/玻纤体系3D机织复合材料的细观应力分布和平均宏观模量,模拟了其蠕变、弹性回复曲线,模型预测与实验结果吻合。
Two kinds of composite beam models were established to simulate the mesostructures of the inner and the surface fiber bundles of 3D woven composites respectively. The model reflects the periodicity of the mesostructures and deformation of the fiber bundles. The local buckling / shear coupling effect of the fiber bundles And partial off-axis effect. The constitutive parameters of isotropic creep of a resin matrix were experimentally determined. Based on this, a constitutive model of transverse anisotropy of fiber bundles was established. The creep constitutive model of the matrix and fiber bundles was applied to the above Meso-composite beam model was used to analyze the macro-averaged viscoelastic stress-strain response of 3D woven composites. The above model was used to analyze the mesoscopic stress distribution and the average macroscopic modulus of an epoxy / glass fiber 3D woven composite. The creep and elastic recovery curves were simulated. The model predictions were in good agreement with the experimental results.