Method and device for reconstructing residual stress field of ferromagnetic component

Abstract

The invention belongs to the technical field of equipment safety assessment, particularly relates to a reconstruction method and device for a residual stress field of a ferromagnetic component, and aims to solve the problems that an existing reconstruction method for the residual stress field needs to treat a surface of the ferromagnetic component, the reconstruction period is long and the operation is complex. The method comprises the following steps: selecting to-be-measured points in an area, needing residual stress field reconstruction, of the ferromagnetic component; measuring each to-be-measured point through a nine-pole magnetic detection sensor to obtain corresponding first induction voltage and second induction voltage; obtaining a principal stress direction angle and a principalstress difference of each to-be-measured point; and obtaining the principal stress and the component stress of each to-be-measured point in an even number of rows in the point array by adopting a shear stress difference method, and reconstructing the residual stress field of the ferromagnetic component. According to the method, the surface of the ferromagnetic component does not need to be treated, the method has the advantages of being wide in application range, high in reconstruction speed and high in efficiency, and the quality of the ferromagnetic component and the safety and reliability of industrial equipment can be evaluated faster and more accurately.

Description

technical field [0001] The invention belongs to the technical field of equipment safety assessment, and in particular relates to a reconstruction method and device for a residual stress field of a ferromagnetic component. Background technique [0002] The main cause of residual stress is uneven heating and cooling during cold rolling, cutting, welding, etc., and it is also related to stress caused by processing conditions and stress caused by structural changes. Residual stress can not only cause defects such as cold cracks, hot cracks, and brittle fractures, but also cause deformation, instability, and lower strength of the welded structure, and in severe cases, it will also affect the stiffness, strength, and size of the structure. Therefore, the existence of residual stress directly threatens the safe operation of industrial equipment. [0003] At present, in the reconstruction method of the residual stress field of ferromagnetic components, the physical detection method...

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Problems solved by technology

[0005] In order to solve the problems that the reconstruction method of the residual stress field in the prior art needs to process the surface of the ferromagnetic component, the reconstruction period is long, and the operation is complicated, the present invention proposes a method and device for the reconstruction of the residual stress field of the ferromagnetic component

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