Dynamic Fracture of Mode I Crack in Orthotropic Composites Studied by Caustics Method
In this paper, the optical method of caustics is developed to apply in dynamic fracture problems of orthotropic materials. The initial curve and the caustics formulas about mode-I crack are derived first from the distribution of stress field to determine the dynamic stress intensity factor (SIF). Meanwhile, dynamic caustics experiments are performed to study the dynamic fracture process of orthotropic materials, during which the dynamic fracture toughness and the velocity of crack propagation are calculated directly from the series of caustics patterns. Moreover, typical mesoanalysis of fracture section are done by a scanning electron microscope (SEM), revealing the fracture mechanism of fiber reinforced material.
Soon-Bok Lee and Yun-Jae Kim
K. Z. Gong et al., "Dynamic Fracture of Mode I Crack in Orthotropic Composites Studied by Caustics Method", Key Engineering Materials, Vols. 326-328, pp. 1003-1006, 2006