A Non-Destructive Surface Hardness Testing Method Utilizing the Transduction Curve of a Magnetostrictive SH0 Guided Wave Sensor

doi:10.3901/JME.260189

Abstract

Abstract: Hardness is one of the core indicators of the mechanical properties of metallic materials. Traditional destructive testing methods are often inadequate for meeting the requirements of structural integrity and high-efficiency inspection in complex service environments. A non-destructive surface hardness evaluation method for ferromagnetic materials is proposed based on the transduction efficiency curve of a magnetostrictive SH₀-mode guided wave sensor. An experimental system with a self-developed electromagnetic acoustic transducer (EMAT) is firstly constructed and then the excited and received SH₀ guided wave signals under different bias magnetic field intensities are measured. Subsequently, the variations of the amplitude of guided waves with magnetic field intensity are determined to plot transduction response curves. Finally, representative characteristic parameters, including maximum amplitude A_Max, mean amplitude A_Mean, and amplitude difference ∆A, are extracted to characterize the magnetoacoustic transduction behavior of the material. The transduction curve profiles and characteristic parameters differed significantly among specimens with varying hardness levels. Further analyses revealed the strong linear correlation between specific parameters and material hardness. A_Max, A_Mean, and ∆A exhibited the consistent trends and good regional adaptability. These parameters could be used as highly reliable non-destructive indicators for hardness evaluation. This method achieved the non-contact, highly sensitive, and quantitative hardness assessment and offered a novel approach for the non-destructive evaluation of the hardness of ferromagnetic materials.

Key words: non-destructive testing, magnetostrictive effect, electromagnetic acoustic transducer, sensor transduction curve, hardness prediction model

CLC Number:

TG156

YUAN Yuan, Liu Xiucheng, QI Pan, Cao Wenbo, Wang Zhenghong, WU Bin, Gao Xiang. A Non-Destructive Surface Hardness Testing Method Utilizing the Transduction Curve of a Magnetostrictive SH₀ Guided Wave Sensor[J]. Journal of Mechanical Engineering, 2025, 62(6): 228-236.

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A Non-Destructive Surface Hardness Testing Method Utilizing the Transduction Curve of a Magnetostrictive SH₀ Guided Wave Sensor

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