Thermal Aging Life Evaluation Method for Polymer Materials Based on Variable Activation Energy
A technology for polymer material and life evaluation, applied in the direction of material thermal analysis, material analysis, investigation phase/state change, etc., can solve the problems of inaccurate evaluation results, no effective evaluation of test structures, etc., to improve the effectiveness and efficiency. The effect of accuracy
Active Publication Date: 2021-06-29
SUZHOU UNIV OF SCI & TECH
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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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[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0044] A method for evaluating thermal aging life of polymer materials based on variable activation energy, including the following steps:
[0045] S1. Perform an accelerated aging test on the polymer material, record the performance index of the polymer material before aging as the initial performance index and the performance index at the end of the life of the polymer material as the termination performance index,
[0046] Between the initial performance indicator and the termination performance indicator, record several intermediate performance indicators and the aging time corresponding to the intermediate performance indicators, and the change process of the two adjacent inte...
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Abstract
The invention discloses a thermal aging life evaluation method of polymer materials based on variable activation energy. According to the change trend of key performance indicators in the accelerated thermal aging process of materials with time, the process is carried out at equal intervals and segmented, and then according to the material experience at different temperatures The corresponding average activation energy is calculated for each interval of aging time, and the average activation energy of different intervals is introduced into the thermal aging life evaluation model, and finally the life evaluation is carried out in stages. Apply regression analysis and correlation test to analyze the regression equation obtained in the above calculation process, and confirm the validity of the obtained regression equation; this method not only improves the life evaluation model, but also improves the accuracy of evaluation. Angle, to ensure the validity of the test data and analysis methods.
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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IPC IPC(8): G01N25/00G01N25/02
CPCG01N25/00G01N25/02
Inventor 石颉
Owner SUZHOU UNIV OF SCI & TECH