Abstract
AbstractIn this paper, the damage accumulation and life prediction in fiber-reinforced ceramic-matrix composites (CMCs) subjected to thermomechanical fatigue (TMF) loading are investigated. The relationships between TMF damage mechanisms, fatigue hysteresis-based damage parameters, fraction of broken fiber, and applied cycles are established. Evolution of fatigue hysteresis dissipated energy, fatigue hysteresis modulus, fatigue peak strain, fatigue broken fiber fraction versus applied cycle curves, and the fatigue life S–N curves is analyzed. Damage accumulation and fatigue life of cross-ply silicon carbide/magnesium aluminosilicate composite under in-phase (IP)- and out-of-phase (OP)-TMF and isothermal fatigue (IF) loading are predicted. Under the same fatigue peak stress, the fatigue lifetime decreases from IF loading at 566°C to IF loading at 1,093°C, IP-TMF and OP-TMF. The TMF loading significantly reduced the fatigue lifetime of CMCs.
Highlights
Ceramic-matrix composites (CMCs) are being designed for hot section components in commercial aero engines
The objective of this paper is to investigate the damage accumulation and life of fiber-reinforced CMCs under thermomechanical fatigue (TMF) loading
Under IP-TMF loading at σmax = 120 MPa, the fatigue hysteresis dissipated energy (FHDE) increases with applied cycle number; under isothermal fatigue (IF) loading at 566°C and 1,093°C at σmax = 120 MPa, the FHDE decreases with applied cycle number, and the FHDE increases with temperature
Summary
Ceramic-matrix composites (CMCs) are being designed for hot section components in commercial aero engines. Yang and Liu [16] developed a new continuum TMF damage model for oxide/oxide CMCs and predicted the damage evolution under coupled cyclic thermal shocks and mechanical loading. Damage accumulation and lifetime prediction of CMCs under TMF loading 609 degradation rate of the interface shear stress at 800°C in air condition is much higher than that at room temperature, leading to greatly decreasing fatigue limit stress. Li [25,26,27] investigated the effects of temperature and oxidation on damage evolution and fatigue lifetime of CMCs. in the researches mentioned above, damage accumulation and life prediction of fiber-reinforced CMCs under IP- and OPTMF and IF loading in oxidizing atmosphere have not been investigated. Experimental damage accumulation and life of cross-ply SiC/magnesium aluminosilicate (MAS) composite under TMF loading are predicted
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