A Mechanism Consistency Method for Accelerated Testing of Nitrile Rubber Based on Failure Physics

Abstract

The invention provides a method for verifying the consistency of mechanisms involved in accelerated testing of butadiene-acrylonitrile rubber based on failure physics. The method comprises the following steps: 1, carrying out a thermo-oxidative aging experiment on the butadiene-acrylonitrile rubber; 2, subjecting an aged sample to a compression stress relaxation test, an infrared spectroscopic test and a thermal analysis test; 3, analyzing the test results of the compression stress relaxation, infrared spectroscopy and thermal analysis of the aged sample; and 4, verifying the consistency of mechanisms involved in accelerated testing of the butadiene-acrylonitrile rubber by using analysis results. According to the invention, the method analyzes and verifies the consistency of mechanisms involved in accelerated testing of the butadiene-acrylonitrile rubber by combining related experimental data of the compression stress relaxation test, infrared spectroscopic test and thermal analysis test, overcomes the problem of how to determine whether degradation mechanisms have abruptly changed due to too high acceleration stress during designing of an accelerated test, guarantees the consistency of failure mechanisms during accelerated testing and is of great practical significance to designing of accelerated tests of the butadiene-acrylonitrile rubber and guaranteeing of validity of experimental data in the future.

Description

technical field [0001] The invention provides a method for the consistency of the accelerated test mechanism of nitrile rubber based on failure physics, which relates to a method for verifying the consistency of the failure mechanism of nitrile rubber in the accelerated test by using failure physics test analysis, which belongs to the analysis of the aging of nitrile rubber Failure Mechanism Methods Technical Field. Background technique [0002] In aerospace and industrial component products, more and more rubber products are used, so the research on the change law of the mechanical properties of rubber materials and their aging behavior has become the focus. Under natural storage conditions, the failure process of rubber materials is slow, and it is difficult to observe changes in its performance parameters in a short period of time. In order to quickly obtain the change law of rubber material properties and predict the remaining life, it is common practice to conduct acce...

AI Technical Summary

Problems solved by technology

However, there are some limitations in practical application: 1) The failure mechanisms of different products under different stress conditions are different. When the failure mechanism of some products changes, the macroscopic morphology and microstructure may not necessarily change significantly. Therefore, when methods such as direct observation, chemical analysis and microscopic observation are used, it is possible that due to reasons such as technical level, testing equipment and operators, no change in failure mechanism is observed; 2) chemical analysis method is suitable for accelerated corrosion test research ; The method of microstructure observation is suitable for the failure mechanism analysis of material level and component level products; for complex products, due to the complexity of the failure mechanism, it is not only necessary to analyze the failure mechanism of each component, but also to consider the mutual coupling between components Therefore, the analysis cost is high, the workload is heavy, and the applicability of this method is poor

[0004] At present, there is a common problem in the use of two types of methods for studying the consistency of failure mechanism at home and abroad, that is, the physical meaning of the failure mechanism criterion is not clear

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