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Method for predicting rubber storage life on basis of compression stress relaxation test equipment

A technology for testing equipment and compressive stress, which is applied in the direction of applying stable tension/pressure to test the strength of materials, so as to improve work efficiency, ensure accuracy and repeatability, and avoid temperature fluctuations

Inactive Publication Date: 2012-07-18
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

In the study of life assessment methods, the dynamic empirical model method is still the main method, and other model methods still need further research and testing

Method used

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  • Method for predicting rubber storage life on basis of compression stress relaxation test equipment
  • Method for predicting rubber storage life on basis of compression stress relaxation test equipment
  • Method for predicting rubber storage life on basis of compression stress relaxation test equipment

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Embodiment Construction

[0025] The testing equipment provided in the present invention can also be used to test the compression set in rubber aging tests at room temperature and high temperature, so as to explore the relationship between compression stress relaxation and compression set. In addition, the device of the present invention can also be equipped with several strain gauges to measure the stress-strain relationship at different positions of the same sample, so as to reduce the error caused by a single measurement.

[0026] The test equipment used is as figure 1As shown, it mainly includes: lower plate 1, limiter 2, upper plate 3, pressure sensor 4, sensor lead wire 5, pressure head 6 and flange 7. The upper plate 3 is placed above the lower plate 1, the lower plate 1 is vertically corresponding to the central position of the upper plate 3, and the central position of the upper plate 3 is provided with a central through hole, each of which is symmetrical to the left and right of the central t...

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Abstract

The invention provides a method for predicting the rubber storage life on the basis of compression stress relaxation test equipment, which belongs to the technical field of rubber life prediction. Firstly, a test sample is prepared and debugged, the test equipment is installed, the test is prepared, and the ageing test is carried out, so different compression stress values are acquired; then the data is processed, MATLAB (Matrix Laboratory) software is utilized to plot the logarithm logt of ageing time through utilizing compression permanent deformation retention rate or stress relaxation retention rate, so scatter diagrams under different ageing temperatures are obtained, and the data in the diagrams is fitted by adopting the Boltzmann mathematical function; and finally, model parameters are determined, and the life is predicted. The method utilizes a pressure sensor and an external data display instrument to monitor the compression stress variation in real time, the sample does not needed to be taken out for the test and does not need to be replaced during the test process, so the temperature fluctuation is avoided, the data fluctuation factor is reduced, and the accuracy and repeatability of the life prediction result are ensured.

Description

technical field [0001] The invention belongs to the technical field of life prediction of rubber materials, and in particular relates to a rubber storage life prediction method based on a compressive stress relaxation testing device. Background technique [0002] During the storage process, rubber products are easily affected by adverse factors in the external environment and lose their use value. In order to ensure that rubber products can effectively exert their performance, it is necessary to reasonably predict the life of their storage period. There are usually natural aging test methods and artificial accelerated aging test methods to study the aging of rubber materials. The natural aging test method is the best way to evaluate the life of materials, but due to the long test period, the uncontrollable environmental conditions, the environmental conditions in different regions are different, and various effects cannot be studied separately, so the natural aging test met...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/18
Inventor 杨明远张卫方符丽君赵丽丁美丽陈宇王爽
Owner BEIHANG UNIV
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