STUDY OF INTERFACIAL STRESS OF SINGLE-FIBER COMPOSITE BY PHOTO-ELASTIC EXPERIMENT
-
摘要: 利用光弹性实验和有限元计算两种方法对单丝拔出复合材料模型的界面剪应力进行了研究。从计算和实验两个方面证明,当在纤维自由端施加一轴向拉力后,在单丝与基体界面的埋入端附近将出现剪应力的最大值。然后,沿着单丝的埋入方向,剪应力迅速降低,在界面区的中间趋于最小值,并且基本稳定不变。由此证明,单丝增强复合材料中界面的应力传递主要集中在单丝的埋入端附近,并且在这一区域最先达到危险应力,发生界面的脱胶破坏,引起整个试件的失效。Abstract: The fiber/matrix interfacial shear stress in the single-fiber reinforced composite was studied by photo-elastic experiment and the finite element method (FEM). Three different load levels were considered. It is found that the interfacial shear stress has a maximum value nearby the embedded top of the fiber/matrix interface. Along the fiber embedded length direction, the interfacial shear stress decreases quickly until it reaches a minimum value in the middle of the fiber. At the end of the fiber, there is a little increasing of the interfacial shear stress. It can be proved that the interfacial stress transformation from fiber to matrix or from matrix to fiber is mainly focused on the region of the embedded top of the fiber/matrix interface, where the interfacial shear stress reaches the critical stress first. In this region, the crack will initiate. Comparing the result of photoelastic experiment with the calculation of FEM simulation, both have the similar interfacial shear stress distribution.
-
Keywords:
- interface /
- shear stress distribution /
- FEM /
- photoelastic experiment
-
-
计量
- 文章访问数: 2215
- HTML全文浏览量: 49
- PDF下载量: 936
下载:
