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Effects of Micro-Damage on the Nonlinear Constitutive Behavior of SiC/SiC Minicomposites
S. Zhang, S. Zhang, X. Gao, X. Gao, J. Chen, J. Chen, H. Dong, H. Dong, Y. Song, Y. Song, Y. Song, H. Zhang
Abstract
The effects of matrix cracking, fiber/matrix interfacial debonding and fiber fracture on the nonlinear constitutive behavior of SiC/SiC minicomposites were studied. An in-situ tensile test was performed to detect the matrix cracking in real time. The macroscopic tensile test was also performed on the SiC/SiC minicomposites to obtain their stress-strain responses. Based on the test results, models of these types of damage were developed. The shear-lag model was adopted to simulate the stress-strain response of SiC/SiC minicomposites. The contributions of these types of damage to the nonlinearity were discussed. The experimental and numerical results showed that fiber fracture occurs near the ultimate stress of minicomposites and that the nonlinear behavior of SiC/SiC minicomposites is primarily caused by matrix cracking and interfacial debonding. In addition, the mechanical behavior will recover its linearity after the saturation of matrix cracks and the complete debonding of the interface.
Keywords
Ceramic matrix composites, nonlinearity, micro-damage, matrix cracks, in-situ mechanical testing
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