Device for calibrating tension and compression type residual stress

Abstract

The invention discloses a tension-compression type residual stress calibration device, which belongs to the technical field of experimental stress measurement in material processing. The device includes a tension and compression loading mechanism, a clamping mechanism and a supporting mechanism. The tension-compression loading mechanism applies uniform tensile or compressive stress in the direction of the entire thickness of the calibration material; the clamping mechanism can adjust the clamping position according to the tension-compression type of the calibration material; the tension-compression loading mechanism and Clamping mechanism, and can adjust the height by itself. The present invention can be used as a supporting loading device for residual stress detection methods such as blind hole method, indentation strain method, etc., to accurately calibrate the stress-strain relationship of materials under tensile stress state and compressive stress state. It solves the problems of convenience and ease of use but uneven stress field during three-point bending loading, or the need for large-size samples and difficult loading when using a tensile testing machine for calibration.

Description

technical field [0001] The invention relates to the technical field of experimental stress measurement during material processing, in particular to a tension-compression type residual stress calibration device, which can calibrate the stress-strain relationship of materials in a tension stress state or a compression stress state. Background technique [0002] Cold and hot processing technologies such as welding, casting and plastic forming have been widely used in various civil and military fields, and play an extremely important role in the development of the national economy and national defense. Uneven heating and cooling during thermal processing will cause considerable residual stress in the component, and the residual stress will have different effects on the mechanical properties of the component, especially reducing the fatigue performance and stress corrosion performance of the component. The uneven deformation of the material during the cold working process causes ...

AI Technical Summary

Problems solved by technology

One-way loading has higher accuracy due to the absence of stress unevenness in the thickness direction, but ordinary tensile or compression testing machines are mostly vertical mechanisms, which has a lot of inconvenience for the calibration process of materials

If a larger sample size is required, and it is easy to bend and lose stability when compressed

Although the loading method of three-point bending is very flexible, the uniform stress area is narrow and the required material size is also large

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