Correlation analysis between mechanical properties of steel materials and ultrasonic signals via electromagnetic acoustic transduction technology

Steel materials are widely used in sectors such as transportation and oil pipelines, making the detection of their mechanical properties critically important. This paper proposes an analytical method for yield strength, tensile strength, and elongation of steel materials based on the principle of the magnetostrictive effect. To validate the proposed method, an electromagnetic ultrasonic testing experiment was designed and conducted, from which relevant electromagnetic ultrasonic signal curves were obtained. Characteristic parameters were then extracted from these ultrasonic signals, followed by an analysis of the correlations between the characteristic parameters and mechanical property parameters. The experimental results show that the Pearson correlation coefficients between the magnetostrictive characteristic parameters and mechanical property parameters all exceed 0.85, and the relative standard deviations of all characteristic parameters are less than 10%.