Mater.Phys.Mech.(MPM)
No 1, Vol. 38, 2018, pages 48-53

CONTACTLESS ELECTROMAGNETIC ACOUSTIC TECHNIQUES OF DIAGNOSTICS AND
ASSESSMENT OF MECHANICAL PROPERTIES OF STEEL ROLLED BARS

V.V. Murav'ev, O.V. Murav'eva, K.V. Petrov

Abstract

The acoustic technologies of the mechanical properties assessment and diagnostics of steel rolled bars based on using contactless electromagnetic acoustic (EMA) transducers of longitudinal, shear and Rayleigh waves and a mirror-shadow technique on multiple reflections are presented. Dependencies of the structural sensitive acoustic factors (absolute values of longitudinal, shear and Rayleigh wave velocities, their changes during the mechanical loading, acoustoelastic coefficients, efficiency of EMA transformation) with elastic and mechanical properties, the quality of heat treatment, the structural and stress-strain state of steel bar samples from springing, low-alloyed perlite and chrome-nickel steels are investigated.

Keywords: : electromagnetic-acoustic technique; velocities of elastic waves; structure; mechanical properties; stress-strain state; acoustoelasticity; defects.

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