一种基于细观摄动参数的MFD界面模型

MFD INTERFACE MODEL BASED ON MICROSCOPIC FLUCTUATION PARAMETERS

基于细观结构分析理论,研究界面对韧性复合材料宏观强度的影响。提出一种基于细观摄动位移(Microscopicfluctuationdisplacement,MFD)的界面模型,以断裂韧性表征界面抵抗脱粘失效的能力。数值算例显示界面对复合材料离轴强度影响较大,界面的破坏改变了基体塑性区的分布规律。

The aim of this paper is to study the effect of the interface on the macroscopic strength of ductile composites on the microscopic scale. An interface model based on microscopic fluctuation displacement (MFD) is proposed. Considering that the debonding of an interface can be regarded as a kind of material fracture, the strength of the interface is characterized by means of fracture toughness. The numerical results show that the effect of the interface on the off-axial strength of fiber-reinforced composites is most intensive and that the interface failure changes the distribution of the plastic zone in the matrix.