Polymer material thermal ageing life assessment method based on variable activation energy

Abstract

The invention discloses a polymer material thermal aging life assessment method based on variable activation energy. Uniformly-spaced segment treatment is performed according to the variation trend ofa key performance index along with time during an accelerated thermal aging process of a material; then corresponding average activation energy is computed according to the aging time of the materialpassing through each interval at different temperatures, and the average activation energy of the different intervals is introduced into a thermal aging life assessment model; and finally, life assessment is performed in stages. Regression analysis and correlation test methods are applied to analyze a regression equation acquired during a computing process, to confirm the effectiveness of the acquired regression equation; the method not only completes the life assessment model, improves the assessment accuracy, and meanwhile ensures the effectiveness of the test data and the analysis method from the perspective of a mathematical statistical method.

Description

technical field [0001] The invention relates to a method for evaluating the aging life of a polymer material, in particular to a method for evaluating the thermal aging life of a polymer material based on variable activation energy. Background technique [0002] During the aging process of polymer materials, there is usually a performance index to characterize its aging degree. This performance index gradually changes with the aging of polymer materials. It is an important parameter and is the most direct and reliable indicator to determine the aging and remaining life of insulating paper. At present, most of the research results are accelerated thermal aging tests on insulating paper in the laboratory environment. According to the change trend of the obtained performance indicators with aging time, combined with the Arrhenius life evaluation model to predict the life. The parameter activation energy in the Arrhenius model is a characteristic parameter of a polymer material...

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Problems solved by technology

Therefore, when evaluating the lifetime, using the average activation energy will inevitably lead to inaccurate evaluation results

[0004] On the other hand, the thermal aging test based on the Arrhenius model does not have a step to evaluate the effectiveness of the tested structure. The above-mentioned problems are problems that need to be solved urgently in this field.

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