Micro-structure response and fracture mechanisms of C/SiC composites subjected to low-velocity ballistic penetration

摘要

Dynamic response and fracture mechanisms of Carbon Fiber Reinforced Silicon Carbide Composites (C/SiC) especially during low-velocity ballistic penetration are studied both experimentally and numerically. The gas gun facility is used to fire spherical metallic projectile for striking velocity of 150 m s(-1) on the target panels, and the impact phenomenon is captured through high-speed photography. A micro-structure based approach is employed to model C/SiC target in this paper. This proposed numerical technique captured the mechanical response (residual energy, expansion process and velocity of debris cloud, fracture morphology and mode) of target, with adequate accuracy. The fracture modes involve void collapse, delamination, fiber bundle splitting and breakage. The debris cloud possesses two types of constituents, classified by fragments' volume and high-energy powdering column at the front. The experimental and calculated results emphasize that the impact velocity, projectile shape and hardness have significant influence on the mechanical behavior of C/SiC composites, including fragment size, fracture surface morphology, fracture mode and mechanism.