碳纤维表面处理及其复合材料界面优化的研究Ⅶ．碳纤维单丝受力状态下的界面结合状态

研究了不同处理的碳纤维单丝在环氧树脂基体中拉伸时的现象及界面剪切强度．拉伸时发现，氧等离子处理纤维的界面附近会出现明显的光弹现象，未处理纤维没有明显的光弹现象，而接枝纤维只在界面上有较弱的光弹线．由拉伸后纤维的平均断裂长度得知，氧等离子处理碳纤维界面结合强度已超过了基体树脂的自身强度，因而产生许多垂直于纤维轴向的裂缝．接枝纤维的界面结合强度，在拉伸时虽然也超过了基体树脂的自身强度，但并不产生垂直于轴向的裂缝，表现出优化界面的特征．

Studies on the Surface Treatment of the Carbon Fiber and Optimization of lts Composite Interface VII.Interface Bonding of Single Carbon Fiber/Epoxy Matrix Under Forced Situation

The phenomena,taking place during stretching of the epoxy resin matrix con-taining a single carbon fiber treated with different methods ,are researched. During stretch-ing,it is found that obvious photoelastic phenomenon appears around the carbon fiber treatedwith plasma,no clear photoelastic phenomenon around untreated one and only weak lines ofphotoelasticity around grafted fiber. Based on mean fragment length of single carbon fibcr af-ter the matrix being stretched it is known that the bonding strength of interface(BSI)of thecarbon fiber treated with O_2 plasma is higher than the strength of epoxy matrix itself,so thatthe cracks of matrix will be generated along with the fiber in the vertical direction from thefiber axis. However ,the cracks in the PAA-grafted fiber/epoxy system can not be generatedalthough BSI between the PAA-grafted fiber and matrix is higher than the strength of resinitself as well.