Testing method for normal temperature and high temperature stress relaxation of flat spring

Abstract

The invention provides a testing method for normal temperature and high temperature stress relaxation of a flat spring. Firstly, a to-be-tested spring sample is prepared, the prepared to-be-tested spring sample is an equal stress sample and has a symmetrical-shaped flat structure; secondly, installation and test preparation of testing equipment are performed, the testing equipment is provided with a base, lateral plates are fixed on the front and the rear sides of the base, the two ends of the to-be-tested spring sample are respectively placed on the lateral plates, the base and an upper plate are fixed together through a limiter, a pressure sensor is mounted on the upper plate, and a pressure head mounted at the lower end of the pressure sensor exerts pressure force onto the sample; then a spring stress relaxation test is performed, and the stress values at different time can be collected; and finally, the condition of stress relaxation loss of the material of the sample is determined. Through the method provided by the invention, the bending deflection of the sample, which is difficult to measure, is converted into electrical signals easy to measure, the work efficiency is improved, the method is simple, and the testing data is accurate.

Description

technical field [0001] The invention belongs to the technical field of stress relaxation testing of sheet springs at normal temperature and high temperature, and in particular relates to a test method for stress relaxation of sheet springs at normal temperature and high temperature. Background technique [0002] Stress relaxation is one of the standards for examining material properties. At present, there is no uniform standard for stress relaxation tests in different countries, and the samples and test devices are also different. Therefore, the test results vary widely and cannot be compared uniformly. At present, the commonly used methods for stress relaxation testing of leaf springs are the variable cross-section cantilever beam method and the mandrel method. Among them, the cantilever beam method uses a variable cross-section specimen to produce a constant fiber strain when bending. The specimen is bent with bolts, fixing the "free end" at a height corresponding to the...

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Problems solved by technology

[0004] In order to solve the problems of low automation, large error, complex and unstable measurement in the normal and high temperature stress relaxation test of leaf springs in the prior art, the present invention provides a method for testing the stress relaxation of leaf springs at normal temperature and high temperature

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