Mechanical behavior and failure mechanism of 2D-SiCf/SiC composite under dynamic tensile loading through experimental and numerical investigation

The mechanical behavior of 2D-SiCf/SiC composite is investigated under both quasi-static (strain rate of 10-5 and 10-4 s-1) and dynamic loading conditions (strain rate of 102 s-1) through a combined experimental and numerical approach. The damage evolution process is monitored using digital image correlation, while failure mechanisms are analyzed through in-situ and post-test observations. Strain rate has a significant effect on tensile behavior of 2D-SiCf/SiC composite, including stress-strain behavior, damage accumulation process, fracture mode and fiber pull-out length. By integrating theoretical models with a detailed meso-scale finite element model, changes in constituent properties due to strain rate are quantified, and the evolution patterns of different damage modes under varying strain rates are explored. The study revealed that the strain rate effect is primarily driven by the enhancement of interfacial shear stress, matrix strength, and in-situ fiber strength as the strain rate increases.