复合材料的Ⅰ型层间断裂韧性

MODEⅠINTERLAMINAR FRACTURE TOUGHNESS OF COMPOSITE

本文采用铰链式双悬臂梁试件对碳／双马来酰亚胺复合材料的Ⅰ型层间断裂韧性进行了研究，分析比较了层间断裂韧性Ｇ＿（ＩＣ）的表达方法，用三次多项式和幂函数拟合实验柔度的方法得到的结果比较满意，实验结果表明纤维桥连对单向层合板的Ｇ＿（ＩＣ）的影响是显著的，用刀片切割桥连纤维后Ｇ＿（ＩＣ）值下降百分之二十，分散性也有显著下降。另外发现Ｇ＿（ＩＣ）值随试件厚度增加而增大。

The mode I Ⅰinterlaminar fracture toughness of graphitc bismal-eimide composite is investigated in this paper by using the hinge double cantilever beam specimen. Some expressions of interlaminar fracture tough-ness G _(IC) are evaluated and compared. The results obtained by methods based on adopting the third polynomial and power function to fit the experimen-tally measured compliance are satisfactory. The result of test indicates that the influence of fiber bridging on G_(IC) of uuidirection lamina is obv-ious.The value of G_(IC) will decrease twenty percent and the scatter of G_(IC)will also decrease obviously after cutting bridging fiber by razor blade. In addition,the value of G_(IC) increases with the increase of specimen thickness.