Abstract
ABSTRACT Thermomechanical analysis of a refractory single-fiber system made of fiber/matrix/coating was conducted at the microlevel with progressive intralayer sliding failure in the matrix material. The effect of the matrix failure on reduction of coating thermal stress was studied using finite element analysis. The analysis included both transient thermal analysis and steady-state stress analysis in a staggered manner. To incorporate the effect of progressive matrix failure, introduction of an interface element and the matrix condensation technique were utilized. The interface element could effectively represent both reduction in stiffness and increase in thermal resistance for heat conduction as failure occurred in the material. The numerical example showed the effect of matrix failure as well as a series of parametric studies of the material properties on the change of thermal stress in the coating. Furthermore, the effective thermomechanical properties of the refractory fiber system were computed using the successive unit-cell approach. A parametric study of the effective thermomechanical properties was also presented.
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