Rubber seal product life prediction method based on aging damage

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...

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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

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