On matrix crack evolution of cross-ply ceramic matrix composite

摘要

The matrix crack evolution of cross-ply ceramic matrix composites under uniaxial tensile loading has been investigated using the energy balance method. When cross-ply ceramic matrix composites are under tensile loading, transverse cracking in 90° ply and matrix cracking in 0° ply occur. The damage states in cross-ply laminates can be classified into five modes. The cracking mode 3 contains transverse cracking, matrix cracking and fiber/matrix interface debonding. The cracking mode 5 only contains matrix cracking and fiber/matrix interface debonding. The cracking stress of mode 3 and 5 appearing between two existing transverse crack is determined. And the multiple matrix crack evolution of mode 3 has been determined. The effects of ply thickness, fiber volume fraction, interface shear stress and interface debonded energy on the cracking stress and matrix crack evolution have been analyzed.