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

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...

AI Technical Summary

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 guaranteed that the accelerated test is the same as the failure mechanism under normal use conditions.

In conventional accelerated test methods and standards, because it is difficult to determine the stress range in which the failure mechanism remains unchanged, there is no requirement for the identification of the failure mechanism, which may lead to wrong reliability data during the test process, which brings great benefits to the later work. come seriously bothered

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