复杂载荷作用下的三维编织复合材料力学性能分析

Mechanics Analysis of 3D Braided Composites Under Complex Loadings

基于螺旋型单胞几何模型和多相有限元理论,建立了三维四向编织复合材料在复杂载荷作用下的力学性能分析模型。通过对代表体积单胞施加不同的复杂载荷比,数值预报了三维四向编织复合材料在双向拉伸和拉剪载荷作用下的破坏点,得到了材料的破坏包络线。结果表明,编织角对三维四向编织复合材料在复杂载荷作用下的破坏影响较大,编织角比较小时,应重视复杂载荷之比对材料破坏的不利影响。此方法为三维编织复合材料在复杂载荷作用下的力学性能分析提供了有效方法。

The mechanical analysis model of 3D four-directional braided composite under complex loadings were developed based on the helix geometry model and finite multiphase element method.The failure points of 3D four-directional braided composites under tension-tension and tension-shear loadings were predicted when different loading ratios are imposed upon the unit cell,and failure envelopes were obtained.The results show that the braiding angle has a significant effect on the mechanical properties of 3D braided composites under complex loadings.The impact of loading ratios on the failure of braided composites should receive more attention.The present numerical method provides an effective tool to predict the mechanical properties of 3D braided composites under complex loadings.