Accelerated storage test and life evaluation and validation method for rubber plug cap of spray tube

Abstract

The invention discloses an accelerated storage test and life evaluation and validation method for a rubber plug cap of a spray tube. The method comprises the following steps: respectively performing constant temperature stress accelerated aging tests on three categories of products, acquiring uniaxial tension maximum tensile strength test data of dumbbell-shaped samples by the tests, acquiring shear strength test data of rubber structure composite material samples, and acquiring shear stress test data of rigid foam plastic structure products; performing performance degradation analysis on thevarious test data, accurately calculating or fitting to obtain performance change rate constants under different temperature stress magnitudes by utilizing an acceleration model, further evaluating storage life of the three categories of products at a normal temperature (25 DEG C), and acquiring a link that is most likely to fail in the spray tube plug cap; and performing accelerated aging tests on real products by utilizing the obtained accelerated factor, and validating whether the service performance of the rubber plug cap meets the requirements after stored for a long time.

Description

technical field [0001] The invention relates to the field of accelerated storage tests in reliability engineering, in particular to an accelerated storage test and a life evaluation method for a rubber plug of a nozzle pipe of a certain system level product. Background technique [0002] Nozzles are one of the storage weak links of a system level product. The front and rear plugs, throat lining, diffusion section, heat insulation layer, and bonding interface of the nozzle are mostly composed of rubber materials, polymer materials and adhesives. The main function of the rubber plug is to establish the normal working pressure of the combustion chamber and ensure the sealing. , Moisture-proof or withstand certain aerodynamic loads. The rubber plug is generally fixed on the surface of the converging section or the diffuser section of the nozzle by adhesive, and the plug is opened by the impact of high-temperature gas when the engine is running; it is required that only the thro...

AI Technical Summary

Problems solved by technology

Since the rubber plug is made of natural rubber except for brocade silk cloth on the surface, and there is an adhesive connection between the plug and the throat liner, it is easy to age after long-term storage, resulting in a decrease in tensile strength and interface debonding. Therefore, the performance of the rubber plug is a constraint. Key Factors of Nozzle Storage Life

At present, there are few studies on the life of rubber plugs at home and abroad, and no reasonable and effective accelerated storage test technology has been formed. The difficulty is that it is not clear which stress, tensile or shear, is the main mode that causes the failure of the plug, and it is impossible to judge the bonding interface. Which one is more likely to age and cause poor performance between the rubber body and the rubber body?

Images