环氧树脂对玻璃纤维/水泥复合材料界面性能的影响

在细观单纤维拔出实验基础上,利用ANSYS有限元程序,结合生死单元方法,对环氧树脂接枝处理的玻璃纤维/水泥基复合材料纤维拔出行为进行数值模拟,获得了界面理想结合/界面非理想结合下的拔出荷载-位移曲线。讨论了环氧树脂光滑接枝与粗糙接枝对玻璃纤维/水泥基复合材料界面强度的影响,研究表明,环氧树脂接枝不仅具有良好的界面结合性,还具有良好的机械嵌合性。

THE INFLUENCES OF EPOXY RESIN ON THE INTERFACIAL PROPERTIES OF FIBERGLASS/CEMENT COMPOSITES

Based on the single fiber representative volume element of fiber reinforced composites,the single fiber pull-out test of fiberglass/cement composites were numerically simulated by using finite element code ANSYS and considering different embedment length.According to experimental data of fiberglass/cement composites,the numerical simulation is reasonable.The effect of graft on the single fiber pull-out of the composite was discussed.Moreover,based on the results of micro-experiments for fiber/matrix interfaces,the single fiber pull-out tests of fiberglass/cement composites were numerically simulated by using finite element code ANSYS and the method of element birth and death.The load-displacement curves were obtained for perfectly bonded interfaces and non-perfectly bonded interfaces.The influences of smooth and rough epoxy graft on the interfacial shear strengh of fiberglass/cement composites were discussed,compared with no graft,the interfacial shear strength results indicated that the smooth epoxy graft improves by 30% and the rough grafted epoxy resin improves by 90%.The results show that epoxy graft not only has good interfacial combination,but also has good mechanical embed effects.