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A Method for Identifying Interface Parameters of Ceramic Matrix Composites

A technology of composite materials and interface parameters, applied in the analysis of materials, testing the strength of materials by applying repetitive force/pulsation force, CAD numerical modeling, etc.

Active Publication Date: 2020-01-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The direct method includes fiber push-in, pull-out, etc., but it measures the interface parameters of a single fiber and can only measure the interface parameters under unidirectional loading

Method used

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  • A Method for Identifying Interface Parameters of Ceramic Matrix Composites
  • A Method for Identifying Interface Parameters of Ceramic Matrix Composites
  • A Method for Identifying Interface Parameters of Ceramic Matrix Composites

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Embodiment Construction

[0074] The present invention is described in further detail now in conjunction with accompanying drawing.

[0075] The following takes the unidirectional C / SiC composite material as an example to identify its interface friction force under fatigue load.

[0076] 1. Carry out fatigue experiments of unidirectional ceramic matrix composite materials, and obtain stress-strain curves of materials under loading and unloading.

[0077] Determine the maximum and minimum fatigue loading stress and number of cycles, carry out fatigue loading and unloading tests, and obtain the stress-strain curves of materials under different cycle numbers.

[0078] In this example, the maximum and minimum fatigue loading stresses are 120MPa and 0MPa respectively, and a total of 1e5 power cyclic loading and unloading experiments are carried out, and the maximum fatigue loading stress is greater than the initial matrix cracking stress. During fatigue loading, debonding and slippage occur at the fiber / ma...

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Abstract

The invention provides a ceramic matrix composite interface parameter identifying method. The method comprises the steps that a unidirectional ceramic matrix composite fatigue test is carried out to acquire a material loading and unloading stress-strain curve; stress and strain corresponding to the highest point and the lowest point of the loading and unloading stress-strain curve under differentcycle numbers are extracted, and the slope thereof is calculated, wherein the calculated values are the experimental values of hysteresis loop secant modulus under different cycle numbers; a crack observation technology is used to measure the average crack spacing of the material under the maximum fatigue loading stress; based on a shear lag model, a symbolic-graphic combination method is used todetermine the theoretical expression of the hysteresis loop secant modulus under different interface debonding and slip states; and the experimental values of the hysteresis loop secant modulus underdifferent cycle numbers are brought into the theoretical expression of the hysteresis loop secant modulus to identify the numerical values of the interface friction force under different cycle numbers. The method provided by the invention can identify the numerical values of the interface friction force under different cycle numbers based on the fatigue loading and unloading stress-strain curve, is simple and easy to implement, and consumes less time.

Description

technical field [0001] The invention belongs to the field of identification of interface parameters of ceramic matrix composite materials, and in particular relates to a method for identifying interface friction force of unidirectional fiber-strength ceramic matrix composite materials under cyclic loads. Background technique [0002] Ceramic matrix composites (CMCs) have broad application prospects in aerospace, automobile manufacturing, and shipbuilding due to their high specific modulus, high specific strength, and high temperature resistance. Fatigue performance is one of the important mechanical properties of ceramic matrix composites. Under the action of fatigue load, CMCs will suffer from matrix cracking, fiber / matrix interface debonding and slippage. The relative sliding between the fiber matrix makes the interface wear and tear, and the performance degradation is one of the important factors for the fatigue failure of the material. Therefore, the identification and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32G01N3/06G01N19/02G01N19/04G01L5/00G06F30/20G06F111/10G06F119/14
CPCG01L5/00G01N3/068G01N3/32G01N19/02G01N19/04G01N2203/0005G01N2203/0062G01N2203/0073G01N2203/0641G06F30/20
Inventor 宋迎东韩笑高希光张盛于国强董洪年
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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