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Synergistic Effects of Loading Sequences and Phase Angles on Thermomechanical Fatigue Damage Evolution of Silicon-Carbide-Fiber-Reinforced Ceramic-Matrix Composites

L. Li

Journal of Ceramic Science and Technology, Vol. 9, No. 4 (2018), pp. 435-464

DOI: 10.4416/JCST2018-00049

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Abstract

In this paper, the synergistic effects of loading sequences and phase angles on the thermomechanical fatigue (TMF) damage evolution of silicon-carbide-fiber-reinforced ceramic-matrix composites (SiC–CMCs) are investigated. Mechanisms-based micromechanical TMF damage models using the hysteresis-based damage parameters are developed to describe the internal damage development of fiber-reinforced CMCs. Relationships between the damage evolution (i.e. TMF hysteresis dissipated energy, hysteresis modulus and peak strain), loading sequences (i.e. constant peak stress loading, low–high peak stress loading sequence and high–low peak stress loading sequence), phase angles (i.e. θ = 0, π/3, π/2 and π) and micro damage states (i.e. fiber/matrix interface debonding/sliding and fiber/matrix interface debonding ratio) are established. The effects of fiber volume fraction, matrix crack spacing, fiber/matrix interface debonded energy, stress ratio and thermal cyclic temperature range on the damage evolution of SiC/SiC composite for different loading sequences (i.e. constant peak stress loading, low–high peak stress loading sequence and high–low peak stress loading sequence) are analyzed. The experimental and theoretical in-phase thermomechanical fatigue damage evolution of SiC/SiC and SiC/magnesium aluminosilicate (MAS) composite subjected to different loading sequences is predicted.

Keywords

Ceramic-matrix composites (CMCs), thermomechanical fatigue (TMF), damage evolution, phase angle, loading sequence

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