2D-C/SiC复合材料偏轴拉伸力学行为研究
摘要
The off-axis tensile mechanical behaviors of 2D-C/SiC composite laminates were obtained by tests under different off-axis angles, and the influence of off-axis angle on the tensile mechanical behaviors was studied. By sticking strain gauges on the surfaces of specimens, the stress-strain behaviors in the loading direction and in the fiber bundle directions of material were obtained and analyzed. Combined with the SEM (scanning electron microscope) results of fractured surfaces on specimens, the coupling effects between tensile and shear damage in the fiber bundle directions were also analyzed. Test results show that the tensile modulus and strength of material decrease significantly with increasing off-axis angle; and there exists obvious mutual effect between tensile and shear damage in fiber bundle orientation. Furthermore, based on the stress-strain data obtained from 0° and 45° tensile tests, a predictive model was built to predict the off-axis tensile stress-strain behaviors of material. The prediction has good agreement with test data.