Residual stress introduction device keeping center position unchanged

Abstract

The invention discloses a residual stress introduction device keeping a center position unchanged. The device includes a base seat, sliding rails, sliding blocks, stress applying components, load sensors, moving fixtures and pressing pieces. The base seat is cross-shaped. A concave platform with a slot is arranged in the middle of the base seat and is used to place a test sample. One end of a loadsensor is connected with a moving fixture, and the other end is connected with a stress applying component, and is connected with an equipped load displayer. A pressing piece is connected with the base seat by a fastening bolt, and is used to press the cross-shaped test sample. According to the device, the test sample is pulled or pressed through the stress applying components with two-end symmetry, uniform and arbitrary residual stress can be generated inside the test sample without introducing other stress, and the introduced residual stress is used as an agreed reference value. The devicecan be used to directly check accuracy and reliability of residual stress detection technology. A manner of applying pulling and pressing stress by the device is simple and convenient, frequent replacement of the stress applying components is not required, and working efficiency is improved.

Description

technical field [0001] The invention relates to the field of material mechanics testing devices, in particular to a residual stress introducing device that keeps the central position fixed. Background technique [0002] Residual stress has an important influence on the performance of service structures. Residual tensile stress will promote crack growth and reduce the fatigue strength of parts. At the same time, the uneven distribution of residual stress will also cause deformation of the parts, affecting the shape accuracy and dimensional accuracy of the parts. Therefore, the accurate measurement of the size and distribution of residual stress has an important impact on the engineering field. At present, more and more scholars are conducting research on non-destructive residual stress detection methods such as instrumented indentation methods. In order to calibrate or calibrate these residual stress detection methods, it is necessary to accurately know the magnitude and di...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of low precision of the prestress introduced by the existing residual stress introducing device and the inability of the uniaxial tensile and compressive residual stress introducing device to introduce more complex plane residual stress, the present invention proposes a residual stress introducing method that keeps the central position fixed. The device can act uniformly and randomly combined residual stress in the sample, and use the introduced residual stress as the agreed true value, which is used for the accuracy and reliability of instrumented press-in equipment to detect the residual stress of the sample

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