Barkhausen noise lossless measuring method and system for ferromagnetic material local stress and strain field

Abstract

The invention discloses a Barkhausen noise lossless measuring method and system for a ferromagnetic material local stress and strain field. A hard disc magnetic head is used for detecting a Barkhausennoise signal in a cyclic magnetization process of a ferromagnetic material, multiple extracted magnetic parameters are input to a pre-established force-magnetic parameter mapping relation neural network model, and a size of the stress or the strain is quantitatively forecasted. The hard disc magnetic head of which a magnetic core terminal air gap is smaller than 1 um is carried by a three-axis moving platform and used for scanning along a local area range of the measured material. A Barkhausen noise detecting device is capable of synchronously detecting the Barkhausen noise signal. The neuralnetwork model is capable of forecasting the size of the stress or the strain of a scanning point, and acquiring the stress field or the strain field within the local area range of the material afterscanning. So a relation of the Barkhausen noise signal in the ferromagnetic material and the stress and strain is calibrated, and rapid and lossless quantitative detection is performed on the local stress and strain field.

Description

technical field [0001] The invention belongs to the field of experimental mechanics, and uses the calibration relationship between Barkhausen noise signals and stress and strain in ferromagnetic materials to perform rapid and non-destructive quantitative detection on local stress and strain fields. Background technique [0002] The non-destructive measurement of stress and strain field of ferromagnetic material is an important content of experimental mechanics. For example, digital image correlation or moiré interferometry can achieve high-precision measurement of the strain field, but the surface of the material needs to be specially treated before the measurement to prefabricate the speckle pattern or the specimen grid; the X-ray diffraction method can measure the residual stress non-destructively. However, single-point detection takes a long time, and the efficiency of stress field testing is low. Barkhausen noise can be used for non-destructive evaluation of stress and ...

AI Technical Summary

Problems solved by technology

However, the current Barkhausen noise detection system has low lateral resolution, does not have the scanning function, and cannot detect the local stress field and strain field of the material.

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