Calibration method for micromagnetic detection of ferromagnetic material structural mechanics performance

Abstract

The invention relates to a calibration method for micromagnetic detection of ferromagnetic material structural mechanics performance, and belongs to the technical field of micromagnetic non-destructive detection. The method includes the steps of selecting samples, wherein a sample not detected and a sample determined to be waste are randomly selected from a production line and a library for parts determined to be waste to serve as a checking sample and a calibration sample respectively, micromagnetic measurement and a conventional mechanics performance test method are carried out respectively, a multiple linear regression method is adopted, and a linear combination equation Y=F(X) formed by micromagnetic parameters is given for each mechanical property parameter; checking model prediction accuracy, wherein the micromagnetic parameters of the checking sample are substituted into a multiple linear regression model to obtain an estimation result of the mechanical property parameters, the error between the estimation result and a conventional measurement result is calculated, and if the error is smaller than a permissible error defined in advance, calibration is completed; otherwise, the steps are repeated. Micromagnetic detection is carried out on samples to be detected, wherein the samples are made of the same material through the same technological process, the obtained micromagnetic parameters are substituted into a multiple linear regression equation set, and the mechanical property of the sample to be detected can be obtained.

Description

Technical field: [0001] The invention relates to a micromagnetic detection and calibration method for the mechanical properties of ferromagnetic material structures, belongs to the technical field of micromagnetic nondestructive testing, and provides a calibration experiment process for effective micromagnetic detection of calibration samples with different mechanical properties. Background technique: [0002] On-line monitoring and evaluation of surface mechanical properties (hardness, residual stress gradient, etc.) of large shoreline natural gas storage tanks, large marine crankshafts, and overall engine blisks is one of the difficult problems in the detection field. Conventional mechanical testing is mostly sampling and destructive, which cannot meet the requirements. Micromagnetic testing technology can perform non-destructive and online testing on multiple indicators such as strength, plasticity, hardness and residual stress gradient. Micromagnetic detection parameter...

AI Technical Summary

Problems solved by technology

[0003] For samples made of the same material through the same process, there is no generalized mathematical model that can describe the correlation between mechanical properties and micromagnetic parameters, that is, it is difficult to directly use micromagnetic parameters to predict mechanical properties theoretically.

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