Method for analyzing validity of degradation data on basis of failure physics

A technology of failure physics and degradation data, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve the problems of erroneous reliability data, unable to represent the true life of the test piece, work troubles, etc.

Inactive Publication Date: 2016-11-16
BEIHANG UNIV
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Problems solved by technology

[0003] Under different accelerated test conditions, the potential failure mechanism of the test piece may be stimulated and become the main failure mechanism, so that the life obtained by the accelerated test cannot represent the real life of the test piece
Due to the complexity and difficulty of determining the stress range of the consistency of the failure mechanism, the accelerated test is often carried out when the failure mechanism is not clear and it is not gu

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  • Method for analyzing validity of degradation data on basis of failure physics
  • Method for analyzing validity of degradation data on basis of failure physics
  • Method for analyzing validity of degradation data on basis of failure physics

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Embodiment Construction

[0039] For the validity analysis method of degradation data based on failure physics involved in this embodiment, see figure 1 shown. The present invention is a method for analyzing the validity of degradation data based on failure physics, and its specific implementation steps are as follows:

[0040] Step 1. Accelerated thermo-oxidative aging test of nitrile rubber

[0041] Step 1.1. According to the main influencing factors of the failure of the nitrile rubber seal, it is determined to be a constant stress accelerated test, and temperature is selected as the accelerated stress.

[0042] Step 1.2. Select temperature as the accelerated stress. Referring to the national standard GB / T2941-2006, determine the three levels of temperature stress as 70°C, 80°C, 90°C and 100°C.

[0043] Step 1.3, refer to the national standard GB1685-1982 "Determination of Compressive Stress Relaxation of Vulcanized Rubber at Room Temperature and High Temperature" to test the compressive stress, ...

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Abstract

The invention discloses a method for analyzing validity of degradation data on the basis of failure physics. The method comprises steps as follows: 1, a thermo-oxidative aging test is performed on nitrile rubber; 2, a compressive stress relaxation test and a Fourier transform infrared spectrum test are performed on an aged sample; 3, infrared spectrum and compressive stress relaxation test results of the aged sample are analyzed; 4, inspection is performed with a method based on data consistency. By means of the steps, whether a failure mechanism of the sample in the aging accelerating process changes is judged through analysis of related experimental data of the infrared spectrum test performed on the accelerated aging nitrile rubber sample, so that whether experimental data in the compressive stress relaxation test are valid is determined; invalid data are eliminated, and the fitting degree of valid data reaches 0.99 through data fitting and is far higher than original 0.93. By means of the method, the blank about analysis of validity of the degradation data of the nitrile rubber before is filled up, and the method has great significance for accuracy and precision of follow-up life prediction.

Description

technical field [0001] The invention relates to a method for analyzing the validity of degradation data based on failure physics, and belongs to the technical field of analysis methods for analyzing aging failure data of nitrile rubber. Background technique [0002] As the characteristics of high reliability and long life of modern equipment become more and more obvious, the demand for its life information is more urgent, and it is necessary to predict its life information through accelerated tests. Accelerated test refers to accelerating the failure of the tested product by strengthening the test conditions under the premise of ensuring that the failure mechanism of the product is not changed, so as to obtain the necessary information in a short period of time to evaluate the reliability or life index of the product under normal conditions. [0003] Under different accelerated test conditions, the potential failure mechanism of the test piece may be stimulated and become th...

Claims

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Application Information

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IPC IPC(8): G01N33/44
CPCG01N33/445
Inventor 张卫方娄伟涛李文利金庭竹王红勋王畏寒
Owner BEIHANG UNIV
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