Residual stress testing method based on profile method, and ancillary device

Abstract

The invention discloses a residual stress testing method based on the profile method, and an ancillary device. The method is characterized in that a sample is appropriately polished and wiped for pretreatment, and aluminum foils are firmly adhered to cutting paths as transitional belts; the sample, to which the transitional belts are adhered, is cut open through a special linear low-speed wire cutting device along a surface to be detected; the cut surface is scanned through a laser profiler to obtain deformed profile data; and data processing is carried out to obtain displacement changes of points on the cut surface before and after stress relief. The testing method disclosed by the invention has the advantages that finite element analysis is carried out through the stress-strain relationship, so that the residual stress distribution of a whole section is finally achieved; the testing method can achieve the residual stress distribution of the whole section, has no requirements for theshape and the material of a tested component, and has the characteristics of high economy and efficiency, and high simplicity in operation; and through the transitional belts adopted in the method, the influence of edge effect is reduced, so that the testing precision is improved.

Description

technical field [0001] The invention relates to the field of residual stress detection, in particular to a method for testing residual stress inside a structure and a corresponding testing device. Background technique [0002] Residual stress is the main factor that threatens the safety of service components. It will not only reduce the strength of components and produce defects such as deformation and cracks; it will also reduce the fracture toughness, fatigue strength, and stress corrosion resistance of materials. , will greatly increase the risk of equipment failure. In fields with complex and harsh service environments such as energy, chemical industry, aerospace, and transportation, if the residual stress is not effectively detected and controlled, it will often cause inestimable economic and social losses. Therefore, it is necessary to use residual stress measurement technology to accurately detect the stress state of components to evaluate its safety performance and ...

AI Technical Summary

Problems solved by technology

[0022] d. It is necessary to consider the influence of the probe size, it is difficult to measure enough profile data for small-sized samples, etc.

Images