Magnetic mixing non-linear detection method used for ferro magnetic material hardness characterization

Abstract

The invention discloses a magnetic mixing non-linear detection method used for ferro magnetic material hardness characterization. A certain signal collection position is selected, a sensor is closelyattached to the surface of a ferro magnetic component, a high and low frequency modulation sinusoidal signal is excitated and used as a mixed excitation signal, and magnetic mixing non-linear detection is conducted; collected magnetic mixing non-linear signals are processed by a computer; detected signal sum frequency and difference frequency components and high frequency and fundamental frequencycomponent amplitudes are extracted, and magnetic non-linear characterization parameters are calculated. By adopting high and low frequency modulation signal excitation, effects of a system resonant frequency non-linear effect on a material non-linear effect are avoided, and the detected material magnetic non-linear effect is sensitive to ferro magnetic material mechanical performance change, andcan be used as characterization of material early mechanical performance degradation. By analyzing and processing the magnetic mixing signals, by means of magnetic mixing non-linear factors, materialhardness change characterization is achieved, so that the magnetic mixing non-linear detection method is beneficial for accurate characterization of material mechanical performance change.

Description

technical field [0001] The invention relates to a method for characterizing the hardness of ferromagnetic materials, in particular to a method for characterizing the surface hardness of ferromagnetic materials based on magnetic frequency mixing nonlinear technology. The method is applicable to the characterization of the surface hardness of ferromagnetic materials and belongs to the field of nondestructive testing. Background technique [0002] As a high-reliability material, ferromagnetic materials have been widely used in aerospace, petrochemical and machinery manufacturing, such as gears of turbine engines and oil and gas pipelines. During the service of lattice structural components, due to the diversity of the environment (high temperature, radiation, etc.) and the complexity of the load (cyclic thermal load, mechanical load, etc.), the mechanical properties of ferromagnetic materials will gradually degrade, causing various types of The early damage accumulation of the...

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Problems solved by technology

For the study of the nonlinear effect of dynamic hysteresis mixing, the extraction of frequency-domain characteristic parameters of magnetic mixing signals and the analysis of the sensitivity to early damage of materials are still blank.

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