Abstract
In this paper, micromechanical constitutive models are developed to predict the tensile and fatigue behavior of fiber-reinforced ceramic-matrix composites (CMCs) considering matrix fragmentation and closure. Damage models of matrix fragmentation, interface debonding, and fiber’s failure are considered in the micromechanical analysis of tensile response, and the matrix fragmentation closure, interface debonding and repeated sliding are considered in the hysteresis response. Relationships between the matrix fragmentation and closure, tensile and fatigue response, and interface debonding and fiber’s failure are established. Experimental matrix fragmentation density, tensile curves, and fatigue hysteresis loops of mini, unidirectional, cross-ply, and 2D plain-woven SiC/SiC composites are predicted using the developed constitutive models. Matrix fragmentation density changes with increasing or decreasing applied stress, which affects the nonlinear strain of SiC/SiC composite under tensile loading, and the interface debonding and sliding range of SiC/SiC composite under fatigue loading.
Highlights
SiC/SiC ceramic matrix composite (CMC) is a type of composite with the SiC fiber as reinforcement and SiC ceramic as matrix
The objective of this paper is to develop a micromechanical constitutive model to analyze the effects of matrix fragmentation and closure on tensile and fatigue behavior of fiber-reinforced CMCs
When the peak stress increases from σmax = 415 to 449 MPa, the interface debonding ratio increases from η = 0.14 to 0.295; the unloading transition stress decreases from σtr_unloading = 209 to 170 MPa; the unloading inverse tangent modulus (ITM) increases from ITM = 5.34 to 7.21 TPa−1; the unloading peak interface counter slip ratio (ICSR) increases from 0.11 to 0.1888; the reloading transition stress increases from σtr_reloading = 206 to 279 MPa; the reloading peak interface new slip ratio (INSR) increases from 0.14 to 0.295; and the reloading ITM increases from ITM = 4.88 to 6.76 TPa−1
Summary
SiC/SiC ceramic matrix composite (CMC) is a type of composite with the SiC fiber as reinforcement and SiC ceramic as matrix. Li [14] predicted the first matrix fragmentation stress in fiber-reinforced CMCs using the energy balance approach considering fiber’s debonding and fracture. Li [28] predicted the non-closure hysteresis loops in fiber-reinforced CMCs at high tensile stress, due to the change of matrix fragmentation density with loading/unloading tensile stress. In the research mentioned above, the synergistic effect of matrix fragmentation and closure with increasing or decreasing tensile stress on tensile and fatigue behavior of fiber-reinforced CMCs have not been analyzed. The objective of this paper is to develop a micromechanical constitutive model to analyze the effects of matrix fragmentation and closure on tensile and fatigue behavior of fiber-reinforced CMCs. Damage models of matrix fragmentation, interface debonding, and fiber’s failure are considered in the micromechanical analysis for tensile response. Experimental tensile curves and fatigue hysteresis loops of mini, unidirectional, cross-ply, and 2D plain-woven SiC/SiC composites are predicted
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