A Life Prediction Method for Adhesive Structures of High-speed EMUs

Abstract

The invention discloses a bonding structure life prediction method of a high-speed motor train unit. First of all, a driving mileage L of the high-speed motor train unit is obtained; according to a relation between the driving mileage L of the high-speed motor train unit and a dynamical load spectrum cycle frequency Q of a test bonding test piece under an alternating climate test condition, the dynamical load spectrum cycle frequency Q of the test bonding test piece under the alternating climate test condition is obtained through calculation; and dynamical load spectrum cycle testing is performed on the test bonding test piece under the alternating climate test condition, then a stretching test is carried out, and a residual strength T of the test bonding test piece is obtained, wherein the cycle frequency is Q and the residual strength T of the test bonding test piece is residual strength of a bonding structure of the high-speed motor train unit. The life of a bonding structure to be predicated on the high-speed motor train unit can be predicted, aging failure behaviors of the bonding structure to be predicted are predicted and evaluated, and test and theoretical support is provided for the strength design of the bonding structure of the high-speed motor train unit.

Description

technical field [0001] The invention relates to the technical field of testing and testing of the bonding structure of high-speed multiple train sets, in particular to a method for predicting the life of the bonding structure of high-speed multiple train sets. Background technique [0002] In modern society, motor vehicles are developing at a high speed, and vehicle adhesives are widely used in motor vehicles. Elastic bonding has the advantages of good sealing, corrosion resistance, simple installation and few parts. It can make up for assembly and construction errors, and the adhesive joint is elastic, which avoids the cracking of the adhesive structure caused by stress concentration. The entire bonding surface participates in strength development and has high peel strength. It can play the role of sound insulation and noise reduction, and increase the comfort and safety of riding. [0003] The operating environment of high-speed EMUs is relatively complex, and the tempe...

AI Technical Summary

Problems solved by technology

After the high-speed EMU runs for a certain period of time, it is impossible to predict the bonding strength design problems of the bonding structure, and it is impossible to know whether the strength of the adhesive layer of the bonding structure can meet the use requirements

There is a lack of a test method to predict and evaluate the aging failure behavior of the bonded structure, and to judge whether the bonded structure is safe, so it is impossible to make the bonded structure safe and reliable by adjusting the form of the bonded structure, the bonded area, the amount of glue, etc. state

During the maintenance of high-speed EMUs, it is not clear whether the strength of the bonding structural adhesive layer can meet the requirements of use, so it is replaced, resulting in a lot of waste

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