Abstract
The influences of interfacial debonding and residual stresses on the tensile stress-strain curve, strength and fracture morphology of unidirectional continuous fiber-reinforced ceramic matrix composites were simulated bythe shear lag analysis combined with the Monte Carlo simulation method. The following features could be described. (a) With increasing interfacial strength, the fracture mode varies from the cumulative type, characterized by the gradual breakage components (fiber, matrix) and interfacial debonding in the fracture process and by the fiber pull-out in the fracture surface, to the non-cumulative one, characterized by the chain reaction mainly of breakage of components and by the overall fracture of the composite perpendicular to tensile axis without fiber pull-out. (b) In the weakly bonded composites, the damages (breakage of fiber and matrix and interfacial debonding) are accumulated intermittently, resulting in a serrated stress-strain curve. (c) In the fracture process of weakly bonded composites, the residual stresses (compressive and tensile axial residual stresses in fiber and matrix, respectively) enhance the breakage of matrix and matrix breakage-induced debonding at low applied strain, leading to reduction in strength of the composite when the fracture strain of the matrix is equal to or lower than that of fiber.
Published Version
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