基于能量等效的2.5维机织复合材料刚度预测

提出了用能量等效原理预测2.5维机织复合材料经向拉伸的弹性模量的方法。以2.5维机织复合材料受经向拉伸载荷时经纱的变形为基础,分析了受经向拉伸载荷时2.5维机织复合材料中经纱、纬纱和填充树脂的变形能,利用各组分材料的变形能之和与整体复合材料的变形能相等的原理,推导出2.5维机织复合材料的经向拉伸弹性模量的计算方法。与试验数据对比发现,本文方法对经纬向拉伸弹性模量的预测结果比采用组分材料力学性能体积平均加权的方法更加精确。结果验证了本文方法的合理性,表明本文的计算公式对纬向拉伸时同样适用,并且本文方法所需要的基础参数更容易获得。

Elastic Property Prediction of 2.5D Woven Composites Based on Energy Equivalence Principle

An approach to predicting the elastic property in warp direction of 2.5D woven composites is developed based on the energy equivalence principle. When the 2.5D woven composites are loaded in the warp direction, the deformation energy of the yarns and the matrix is analyzed. Then the prediction method for the elastic property in warp direction of 2.5D woven composites is conducted by the equality relation between deformation energies of components and composites. Compared with the experimental data, the prediction results of the energy method are better than that of the volume average method, which proves the effectiveness of the method. It is also found that the parameter used in the method is easy to conduct.