Effect of off-axis angle on mesoscale deformation and failure behavior of plain-woven C/SiC composites with digital image correlation

Authors：Teng, Xuefeng; Lyu, Shuangqi^*; Hu, Xiaoan; Jiang, Yun; Nie, Xiangfan; Liu, Xin; Li, Longbiao

Source：Journal of the European Ceramic Society, 2022, 42(12): 4712-4722.

DOI：10.1016/j.jeurceramsoc.2022.05.019

• Plain-woven
• C
• SiC composites
• Digital image correlation
• Off-axis
• Failure behavior

In this study, the deformation response and failure behavior of a plain-woven C/SiC composite were investigated under on-axis and off-axis tensile loading. Digital image correlation (DIC) was utilized to characterize the full field deformation and mesoscale strain distribution. The test results indicate a strong influence of the woven architecture on the mechanical properties and strain distribution, and the materials exhibit failure modes dependent on the loading directions or off-axis angles: the fracture positions of different layers are the same under off-axial load, while for on-axil loading, the fracture positions of different layers do not affect each other. SEM results provide direct evidence that the width of the off-axis specimen has a great influence on the mechanical properties. The reduction of the modulus and strength of off-axis specimen, is not only due to the off axis loading, but also due to the reduction of effective bearing area or effective bearing fiber.

• Institution
  南昌航空大学; 南京航空航天大学