三维角联锁结构复合材料弹性性能的细观设计探讨

基于对三维角联锁结构复合材料真实细观结构的图像分析,建立了几何分析模型,在该模型中假设经纱的横截面呈矩形,纬纱的横截面呈凸透镜形,并运用刚度平均原理,推导出了以角联锁结构复合材料预制件的7个宏观设计参数和纤维、树脂的弹性性能指标为参数变量的弹性性能计算公式,在此基础上编制了能提供三种选择的计算机预测软件,即选择组织结构、力学模型和任意一个偏轴角,从而初步实现了角联锁结构复合材料弹性性能的细观设计.实验结果表明,依据本研究提出的几何分析模型并采用刚度平均理论预测的等效工程弹性常数与实际测得的值之间总体趋势相同,数据基本相符.

Micro-design of Elastic Property for 3D Angle-interlock Structure Composites

An investigation is reported in which a geometric model based upon analyzing micrographs of sections for 3D angle-interlock structural composites was developed. The rectangular cross-section of the warp and the convex cross-section of weft were assumed in the geometric model. The predicting equations of equivalent engineering elastic constants were worked out according to variable parameters including seven structural parameters and elastic constants of fiber and resin using the stiffness averaging method and the geometric model. Equivalent engineering elastic constants predicting software of 3D angle-interlock structural composites were programmed, which provides three choices of weave structure, mechanical model and axis-off angle. Micro-design of elastic property for 3D angle-interlock structural composites is achieved basically. The experiment results show that both values of theory prediction of equivalent engineering elastic constants and experiments data are accordant.