Comparison of two methods for testing the in-plane shear property of 3D stitched plain woven C/SiC composites

摘要

Three types of three-dimensional stitched carbon fiber reinforced silicon carbide composites (3DS C/SiCs) with 4, 9 and 16 Z-yarn/cm~2 were fabricated by chemical vapor infiltration, respectively. Both iosipescu specimens without enough representative volume elements (RVEs) and ±45° tension specimens containing enough RVEs were tested to attain the in-plane shear properties of 3DS C/SiCs. The results showed that these two methods produced similar results. This demonstrated that the dimensions of iosipescu specimens were not necessary to cover enough RVEs for 3DS ceramic matrix composite in-plane shear testing. With respect to the shear modulus, both two methods would be regarded as the effective methods. However, in terms of the in-plane shear strength, iosipescu method would be a more reliable method.