Rubber seal product life prediction method based on aging damage

A technology for life prediction and rubber products, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low accuracy, low accuracy, and variable calculation cannot be programmed, and achieve high prediction accuracy and prediction Wide temperature range effect

Active Publication Date: 2019-02-15
SHANDONG NON METALLIC MATERIAL RES INST
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The second method is an accelerated aging test prediction method based on the reaction mechanism theory and molecular structure parameters. The computer is directly used as a simulated aging box for accelerated aging tests. This method must be based on a full understanding of the rubber aging reaction mechanism and molecular structure parameters. On the basis of complete mastery, due to the limitation of objective conditions, the development is relatively slow
[0006] Among them, the mathematical model method combines the aging rate constant k with the Arrhenius equation by using the P=f(t) kinetic equation to obtain the expression of P=f(T, t), which overcomes the long test time of the linear relationship method, Disadvantages of the variable conversion method that cannot be programmed and the accuracy is not high
[0007] During the aging process of sealing products, many characteristic parameters will change, including changes in a series of mechanical indicators such as hardness, elongation, tensile strength, and elongation at break; Chemical changes (such as broken chains, new cross-links) occur, resulting in permanent compression deformation and compressive stress relaxation in which the deformation is basically unchanged as the stress becomes smaller. The traditional life prediction of sealing products uses compression permanent deformation as the life evaluation. The characteristic index cannot comprehensively and objectively evaluate the factors affecting aging, and the accuracy is not high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rubber seal product life prediction method based on aging damage
  • Rubber seal product life prediction method based on aging damage
  • Rubber seal product life prediction method based on aging damage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] by The fluorosilicone rubber O-ring is used as an example to illustrate the specific characterization process.

[0032] Obtain the highest test temperature T of the fluorosilicone rubber by thermogravimetric method max 200°C, 120°C, 150°C, and 180°C were used as the hot air aging test temperature, and the compression rate was 25% as the load condition. 20d, 25d, 30d, 45d, 55d.

[0033] The test sample is 15 pieces Type fluorosilicone rubber O-rings.

[0034] According to GB / T 2941-2006 method for state adjustment, GB / T 3512-2014 for accelerated aging by hot air; according to GB / T 1685-2008 and GB / T 7759.1-2015 for the determination of compressive stress relaxation and compression set. The test data are shown in Table 1.

[0035] Table 1 Fluorosilicone rubber O-ring hot air aging test results table

[0036]

[0037] For the data in Table 1, according to the grey correlation degree calculation process, calculate the correlation degree g of the compressive stres...

Embodiment 2

[0052] by Type silicone rubber O-ring as an example to illustrate the specific characterization process as follows.

[0053] Obtain the highest test temperature T of the silicone rubber by thermogravimetric method max 200°C, 100°C, 125°C, 150°C, and 175°C are used as the hot air aging test temperature, and the compression rate is 25% as the load condition. The sampling period is 0d, 2d, 4d, 6d, 10d. , 16d, 20d, 25d, 30d, 45d, 55d.

[0054] The test sample is 20 pieces Type silicone rubber O-rings.

[0055] The laboratory environmental test and the construction method of the aging damage factor are the same as those in Example 1 (the original test data is omitted), and the A of the silicone rubber O-ring at different temperature points f The values ​​are shown in Table 4.

[0056] Table 4 Life evaluation characteristic index A of silicone rubber O-rings at different temperature points f Value table

[0057] time(d)

100℃

125℃

150℃

175℃

0

0....

Embodiment 3

[0063] by The fluororubber O-ring is used as an example to illustrate the specific characterization process as follows.

[0064] Obtain the highest test temperature T of the fluororubber by thermogravimetric method max The temperature is 200°C, 100°C, 125°C, 150°C, and 175°C are used as the hot air aging test temperature, and the four compression ratios of 15%, 20%, 25%, and 30% are used as the load conditions to carry out the hot air aging test. The sampling period They are 0d, 1d, 3d, 7d, 10d, 15d, 20d, 25d, 30d, 35d, 40d, 60d, 75d, 90d, 110d, respectively.

[0065] The sampling cycle after combination according to the principle of "low temperature and high compression, high temperature and low compression" is shown in Table 5 below.

[0066] Table 5 Fluorine rubber accelerated life test sampling table

[0067]

[0068] The test sample is 40 pieces Fluorocarbon O-rings.

[0069] The laboratory environmental test is the same as in Example 1, and the correlation degr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of life prediction, relates to a laboratory life prediction method of a rubber product. Basic damage parameter weights are distributed according to grey relational degrees of a multi-temperature point laboratory environment, an aging damage factor Af is constructed, an Af-T-t model is established, and life prediction for a target sample is realized. According to the laboratory life prediction method of the rubber product, permanent compression set is taken as a basic parameter, an interval from normal temperature to the highest test temperature Tmaxof a to-be-tested sample is taken as a test temperature interval, 15%-30% of the permanent compression set is taken as test load, then the grey relational degree gi of the basic damage parameter on the permanent compression set is calculated, the damage factor Af of the to-be-tested sample is obtained, (1-Af) is utilized as a life evaluation characteristic index, a ternary model of Af-T-tau is obtained, and ageing time tau of the same test temperature is substituted respectively, so that the life value at the expected storage temperature is obtained. According to the rubber seal product lifeprediction method, the prediction accuracy is higher, and the temperature range is wide. The method is applicable to life prediction of the rubber seal product.

Description

technical field [0001] The invention belongs to the field of equipment life prediction, relates to a laboratory life prediction technology, and particularly relates to a laboratory life prediction technology for rubber products. Background technique [0002] The life prediction technology of sealing materials and products involves material science, material aging, structural design, structural mechanics, material test science, computer simulation, data processing technology, etc. At present, there are three methods for determining the life of rubber products at home and abroad: [0003] One is to classify the raw rubber according to the heat aging resistance recommended by ISO and give the corresponding life. This method takes more into account the impact of raw rubber on rubber products and ignores the effects of compounding agents such as vulcanizing agents and antioxidants. [0004] The second method is the accelerated aging test prediction method based on the reaction me...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 孙岩冯典英李晖王荣华庞明磊郑会保王登霞李倩倩谢可勇王新波刘亚平崔俞
Owner SHANDONG NON METALLIC MATERIAL RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap