Residual stress standard test block valuing and tracing method

Abstract

The invention discloses a residual stress standard test block valuing and tracing method, and belongs to the technical field of residual stress calibration. According to the method, calibrated X-ray diffraction method residual stress test equipment is used as a transmission standard, the X-ray diffraction method residual stress test equipment with high measurement precision is calibrated by using a test block in loading, and the test equipment is ensured to be capable of setting a value for the unloaded test block; according to the standard test block prepared by the method, a constant-value stress standard test block is stored in a constant-temperature storage manner, and the standard test block with any residual stress value can be obtained by adjusting the loading force value, so that the standard test block can be used in different occasions, and full-scale calibration of the residual stress test equipment is realized. The standard test block value can be traced to a laboratory force value standard and a length standard, and traceability is reliable. The standard test block prepared by the invention is convenient to carry, various residual stress test equipment can be calibrated at any time, and accurate measurement of residual stress is realized.

Description

technical field [0001] The invention relates to a method for determining and tracing the source of a residual stress standard test block, belonging to the technical field of residual stress calibration. Background technique [0002] Residual stress is the self-equilibrium internal stress that remains in the object after eliminating the effects of external force or uneven temperature field. Residual stress has a significant impact on the mechanical properties of the component, which will cause the component to warp or twist, deform or even crack. Reduce the fatigue resistance and stress corrosion ability of materials, resulting in the inability to assemble components, reduce the service time and even cause serious accidents, etc. Accurate measurement of residual stress has a great effect on changing the fatigue life of components, preventing deformation and brittle failure of components, and improving the service safety of components is of great significance. At this stage, ...

AI Technical Summary

Problems solved by technology

At this stage, residual stress test methods are mainly divided into two categories: destructive test method and non-destructive test method. The typical method of destructive test method is the blind hole method, and the non-destructive test method mainly includes X-ray diffraction method, ultrasonic method, neutron Diffraction method, etc., but there is no relatively perfect method for the calibration of residual stress testing equipment. The standard test block can be used as a method for the calibration of residual stress testing equipment. In order to ensure the accuracy and reliability of the calibration results, it is necessary to calibrate the standard test block Reasonably set the value and ensure that the standard stress value of the test block can be traced to the existing laboratory standard device

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