短纤维橡胶基复合材料模量的理论预测

THE PREDICTION ON THE YOUNG'S MODULUS OF SHORT FIBER RUBBER COMPOSITES

基于Halpin—Tsai方程，引入短纤维平均长度和取向因子fp考虑尼龙短纤维／氯丁橡胶、天然橡胶复合材料中短纤维的长度分布和纤维取向对纵向杨氏模量的影响.提出直接用fp修正ζ来考虑取向影响的新方法：ζθ（fp＝Ld-1（fp＋1）．结果表明，纵向模量的理论预测值和实验值的相关性较好．对横向模量，用ζ＝2＋Kvf。

The longitudinal and transverse young's modulus of short nylon fiber/natrul rubber and neoprene composites were predicted. Based on Halpin-Tsai equation, the average length and orientation factor in were introduced into it to consider the effect of short fiber length distribution and orientation on the longitudinal young's modulus of composites. A new way vvhich expressed the effect of orientation on the longitudinal young's modulus by means of fp modifying ( was put forward:= Ld-1(fp+1). The results showed that the predicted values of longitudinal young's modulus fitted biber to the experimental data. To the prediction of transverse young's modulus of composites, the effect of orientation of short fiber on modulus was considered through 2+Kvf where K was constant which varied depending on different composite. The result showed that there was a successful prediction on transverse young's modulus of these two kinds of composites.