Characterization of cyclic loading/unloading damage behavior in fiber-reinforced ceramic-matrix composites using inverse tangent modulus

Under cyclic loading/unloading, the mechanical hysteresis appears in fiber-reinforced ceramic-matrix composites (CMCs) due to multiple micro damage mechanisms. In this paper, the cyclic loading/unloading damage evolution in different CMCs is analyzed using the inverse tangent modulus (ITMs). Experimental micro damage mechanisms are observed using the X-ray computed tomography (XCT) and scanning electron microscopy (SEM). Based on the damage mechanisms' analysis, a damage-based micromechanical constitutive model is developed to predict the cyclic loading/unloading curves and related damage parameters. Effects of composite's constitutive properties, peak stress, damage state and interface properties on the cyclic loading/unloading damage evolution are discussed. For the 1D and 2D SiC/SiC, and 3D C/SiC composites, the evolution curves of ITMs can be divided into two regions. In region I, the increasing rate of the ITMs is constant and depends on the composite's constitutive properties; and in region II, the increasing rate of the ITMs decreases as the interface slip range approaches the interface debonding tip.

Automated summary

This paper analyzes the damage evolution of different fiber-reinforced ceramic-matrix composites (CMCs) under cyclic loading/unloading using the inverse tangent modulus (ITMs). Micro damage mechanisms are observed experimentally using X-ray computed tomography (XCT) and scanning electron microscopy (SEM). Based on the analysis of the damage mechanisms, a damage-based micromechanical constitutive model is developed to predict the cyclic loading/unloading curves and related damage parameters. The effects of composite's constitutive properties, peak stress, damage state, and interface properties on the cyclic loading/unloading damage evolution are discussed. The results show that the evolution curves of ITMs can be divided into two regions, with different growth rates in each region.