关键词:
ceramic-matrix composite
fracture
low-velocity impact
computerized tomography analysis
摘要:
Continuous carbon fiber reinforced silicon carbide(C/SiC)composites are often subjected to low-velocity impacts when utilized as structural materials for thermal ***,research on in-plane impact damage and multiple impact damage of C/SiC composites is *** investigate the in-plane impact damage behavior of C/SiC composites,a drop-weight impact test method was developed for strip samples,and these results were subsequently compared with those of C/SiC composite *** show that the in-plane impact behavior of C/SiC strip samples is similar to that of C/SiC composite *** of the impact load with displacement is characterized by three stages:a nearly linear stage,a severe load drop stage,and a rebound stage where displacement occurs after the impact energy exceeds its peak *** damage behavior under single and multiple impacts on 2D plain and 3D needled C/SiC composites was investigated at different impact energies and *** propagation in C/SiC composites was studied by computerized tomography(CT)*** the 2D plain C/SiC composite,load propagation between layers is hindered during impact,leading to delamination and 90°fiber brittle *** crack length perpendicular to the impact direction increases with impact energy increases,resulting in more serious 0°fiber fracture and a larger area of fiber *** the 3D needled C/SiC composite,load propagates between the layers during impact through the connection of needled *** fibers continue to provide substantial structural support,with notable instances of fiber pull-off and ***,the impact resistance is superior to that of 2D plain C/SiC *** the 3D needled C/SiC composite undergoes two successive impacts of 1.5 J,the energy absorption efficiency of the second impact is significantly lower,accompanied by a smaller impact ***,the total energy absorption efficiency of these two impacts of 1.5 J is lowe