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

A stress-strain curve and composite material technology, which is used in the field of stress-strain curve prediction of arbitrary loading and unloading of ceramic matrix composites in high temperature oxidation environment

Active Publication Date: 2020-06-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0005] The invention provides a method for predicting the stress-strain curve of ceramic matrix composite materials in...

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

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Embodiment Construction

[0074] Below in conjunction with embodiment the present invention will be further described.

[0075] Some parameters in this embodiment are shown in Table 1

[0076] Table 1

[0077]

[0078] A method for predicting the stress-strain curve of a ceramic matrix composite material in a high-temperature oxidation environment under random loading and unloading, comprising the following steps:

[0079] Step 1: Determine the crack density and crack spacing of the unidirectional SiC / SiC ceramic matrix composite matrix based on the Monte Carlo simulation method for cracking the matrix of the unidirectional SiC / SiC ceramic matrix composite;

[0080] The concrete steps of described step one are:

[0081] Based on the Monte Carlo method to simulate the matrix crack of the unidirectional SiC / SiC composite material, the loading process is as follows Figure 9 As shown, to determine the crack spacing of the matrix at the time of initial loading, the failure probability of the matrix i...

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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...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/15G16C60/00G06F119/14
CPCG16C60/00
Inventor 宋迎东陈西辉刘炎孙志刚牛序铭高希光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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