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Working condition simulation and pre-estimating method for service lifetime of rubber sealing element

A rubber seal and life-span technology, applied in the direction of applying stable tension/pressure to test material strength, etc., can solve the problem of imprecise engineering value of permanent deformation critical value, cumbersome statistical analysis of empirical parameters, and uncertainty of rate of change of normal temperature state and other issues, to achieve the effect of rigorous and reliable evaluation results, scientific methods, and avoiding uncertainty

Inactive Publication Date: 2015-04-29
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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Problems solved by technology

The shortcomings of the method described in this empirical formula include: application limitations, cumbersome statistical analysis of empirical parameters, imprecise engineering values ​​for critical permanent deformation, and uncertainty in extrapolating the rate of change of normal temperature state from high temperature data

Method used

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  • Working condition simulation and pre-estimating method for service lifetime of rubber sealing element
  • Working condition simulation and pre-estimating method for service lifetime of rubber sealing element
  • Working condition simulation and pre-estimating method for service lifetime of rubber sealing element

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Embodiment Construction

[0014] Below in conjunction with embodiment the present invention is further described.

[0015] The daily storage temperature of the gas device is 20°C, and the technical index requires no leakage within 10 minutes at 0.40MPa. The connecting part of the device is sealed by an O-ring, and the sealing ring is made of silicon rubber. The service life of the sealing ring in the assembled state is estimated by testing.

[0016] Step 1, test condition selection and sample preparation.

[0017] Select test conditions with reference to standards, including: test parameters, sample specifications, temperature values, test times, and sampling time intervals. The operation process is: refer to the standard, determine the compression rate of the material deformation test and the sample specification; determine the reference temperature according to the storage temperature requirements of the product at room temperature, and determine the acceleration temperature according to a certain ...

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Abstract

The invention relates to a working condition simulation and pre-estimating method for service lifetime of a rubber sealing element. The method includes: a step of test condition selection and sample preparation, a step of performance parameter testing and curve mapping, and a step of high-temperature accelerating simulation testing and service lifetime pre-estimating, wherein during test condition selection and sample preparation, testing conditions comprising testing parameters, sample specification, temperature values, the number of the times of testing and a sampling time interval are determined; during performance parameter testing and curve mapping, a permanent deformation main curve is mapped through a series of temperature permanent deformation tests and an acceleration coefficient is obtained; and during high-temperature accelerating simulation testing and service lifetime pre-estimating, a sample is put into a sealing structure, the acceleration temperature and the acceleration coefficient are selected, a high-temperature accelerated failure time is determined by a high-temperature acceleration test, and the pre-estimated service lifetime is calculated according to the acceleration coefficient. The method determines the acceleration coefficient by using the permanent deformation main curve and determines the failure time by the acceleration test under real working condition. The method has advantages of convenient operation, testing safety, accurate data and reliable analysis.

Description

technical field [0001] The invention relates to a trouble-free working time evaluation technology for normal operation of polymer products, in particular to a working condition simulation prediction method for the service life of rubber seals. Background technique [0002] China Chemical Industry Standard HG / T3087-2001 "Quick Determination Method for Storage Period of Static Sealing Rubber Parts" regulates the life evaluation method of traditional sealing rubber parts. It adopts the high temperature accelerated aging test method, and uses the empirical formula of "the relationship between the chemical reaction rate constant and the temperature change" to describe the relationship between the permanent deformation of the material and the time. The shortcomings of the method described in this empirical formula include: application limitations, cumbersome statistical analysis of empirical parameters, imprecise engineering selection of critical permanent deformation values, and ...

Claims

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Application Information

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IPC IPC(8): G01N3/18
Inventor 池旭辉彭松朱学珍封学华常华
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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