Method for predicting arbitrary loading and unloading stress-strain curve of ceramic-based composite material in high-temperature oxidation environment

Abstract

The invention discloses a method for predicting an arbitrary loading and unloading stress-strain curve of a ceramic-based composite material in a high-temperature oxidation environment. The method caneffectively simulate the arbitrary loading and unloading stress-strain curve of a unidirectional SiC / SiC composite material in a high-temperature oxidation environment; according to the method, the influences of the matrix crack density and width, the interface oxidation consumption length and the fiber tensile strength on the length and distribution of an interface slip region during loading ona stress-strain curve of the composite material in a high-temperature oxidation environment are considered; according to the method, a theoretical basis can be provided for the calculation of the fatigue life of the unidirectional SiC / SiC composite material under spectral load loading in the high-temperature oxidation environment; the method overcomes the defects of high test cost and high manpower and material resource consumption in the oxidation test of the arbitrary loading and unloading of the unidirectional ceramic-based composite material, and can save a large amount of manpower and material resources.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for predicting stress-strain curves of ceramic-based composite materials in a high-temperature oxidation environment under random loading and unloading. Background technique [0002] Silicon carbide fiber reinforced silicon carbide ceramic matrix composites (Silicon carbide fiber reinforced silicon carbide composites, hereinafter referred to as SiC / SiC) is a new type of high-temperature structural material for the hot end parts of aero-engines. It has high specific strength, specific stiffness and other characteristics, and can effectively Achieve weight reduction of hot end components. In the service environment, on the one hand, SiC / SiC composite components have to bear the damage caused by high temperature oxidation environment; Load, the inconstant load makes the change of components (matrix, interface and fiber) inside the material more comp...

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Problems solved by technology

[0005] The invention provides a method for predicting the stress-strain curve of ceramic matrix composite materials in a high-temperature oxidation environment under arbitrary loading and unloading, so as to solve the problems in the prior art

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