Leading-in device for planar random residual stress

Abstract

The invention discloses a leading-in device for a planar random residual stress, and the device comprises a base body, a loading assembly, a load sensor, a movable clamping tool, and a fixed pressingpiece. The base body is shaped like L, and two end faces are provided with circular threaded through holes, and two side surfaces are provided with openings for leading out load sensor wires. The interior of the base body is provided with a platform for supporting a sample, and a connecting part for constraining two end parts of the sample. The load sensor is equipped with load displays which areconnected, and the load sensor is disposed in the base body, and is connected with the loading assembly and the movable clamping tool. According to the invention, the device can generate uniform residual stress, which is in a random pull-press combination and can be directly read, in the sample, so that the residual stress that is led in is taken as an appointed reference value which is used for directly verifying the accuracy and reliability of the residual stress detection technology.

Description

technical field [0001] The invention relates to the field of testing devices for mechanical properties of materials, in particular to a device for introducing arbitrary residual stress on a plane. Background technique [0002] Residual stress refers to the stress that exists inside the object in a balanced state when there is no external force, and its root cause is the non-uniform deformation inside the object. In mechanical manufacturing (such as welding), remanufacturing (such as surface strengthening) and service processes (such as pressure vessels), due to mechanical, thermal, chemical and other factors, residual stress inevitably exists on the surface of workpieces or structures. Residual stress will significantly affect the service performance of materials and workpieces, such as fracture, fatigue, corrosion resistance, etc., so it needs to be accurately measured. Existing non-destructive testing techniques for residual stress are relatively abundant, including nano-...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the difficulties and high cost of the existing residual stress standard sample preparation, the insufficient precision of the bending residual stress introduction device and the incomplete data volume of the uniaxial tension and compression residual stress introduction device, the present invention proposes a planar arbitrary residual stress introduction A device that can generate uniform, arbitrary tension-compression combinations and directly readable residual stress inside the sample, so that the introduced residual stress can be used as an agreed reference value to directly test the accuracy and reliability of the residual stress detection technology

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