基于纤维正交单元层合板面内零膨胀的模型优化分析∗

摘要

In this paper,the expression of planar thermal expansion coefficients of the fiber orthogonal cell lami-nates which were called FOCL-CTEs,was deduced based on the classical lamination theory.The effects of fiber volume fraction and the kinds of the epoxy resin on FOCL-CTEs were also studied.It was shown that FOCL-CTEs were independent of ply angles,ply stacking sequences and layers.But when the fiber had greater nega-tive longitudinal thermal expansion coefficient,the FOCL-CTEs would be zero when the fiber volume fraction was adj usted.%基于经典层合板理论，推导出纤维正交单元复合材料层合板面内两个方向热膨胀系数的计算表达式。从理论上分析了不同的纤维体积含量、环氧树脂种类对纤维增强复合材料层合板面内两个方向热膨胀系数的影响。分析结果表明，纤维正交单元层合板面内热膨胀系数与其铺层角度、铺层顺序、层数均无关；采用纤维方向有较大负热膨胀系数的纤维，并调节纤维的体积含量，可以得到面内近零膨胀的复合材料。