This study investigates the reflection behaviour of SH0 guided wave mode from a flat plate edge. SH0 is generated using Periodic Permanent Magnet - Electromagnetic Acoustic Transducers (PPM-EMAT) of constant wavelength (λ). Reflection characteristics of this mode are studied by varying the angle of incidence from 0° to 70°. The probes are positioned in such a way that incident and reflected angles are equal. The response of SH0 mode at the various angle of incidents is explored in terms of amplitude variation. 3D finite element model is developed to investigate reflection characteristics of SH0 mode further. The exact configuration of the PPM-EMAT has been simulated using a two-stage modelling approach. The spatially varying Lorentz force was calculated in the electrodynamic module and then applied to the elastodynamic module, and the resulting elastic disturbances are compared with experimental results. © 2019 Author(s).

Krishnan Balasubramaniam

Department of Mechanical Engineering

Nived Suresh

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Reflection study of SH0 mode with plate edge at different incident angles

AIP Conference Proceedings

This paper reports simulations of the generation of Lamb wave modes in thin plates using a meander coil (meander line) EMAT, which works under the principle of Lorentz force mechanism in non-magnetic materials. The numerical simulations have been compared with measurements. The numerical work presented in this paper is divided into two parts. First, a 2D electromagnetic model is developed for calculating the Lorentz force density, which is the driving force for elastic wave generation within the plate. Second, the calculated force at each point in the metal is used as the driving force for generating elastic wave modes in the plate. These calculated Lamb wave modes are compared with those generated experimentally in a thin plate. Additionally, the measured wave modes are analyzed with the help of dispersion curves and a timefrequency analysis. Our numerical work is also extended to analyze the interaction of Lamb wave modes with defects. The simulations compare favorably with the measurements presented here. © 2010 Elsevier Ltd. All rights reserved.

NDT and E International

A hybrid finite element model for simulation of electromagnetic acoustic transducer (EMAT) based plate waves

The Journal of the Acoustical Society of America

The scattering of the fundamental torsional mode from axi-symmetric defects with varying depth profile in pipes

Low-frequency pulse echo reflection of the fundamental shear horizontal mode from part-thickness elliptical defects in plates

Scattering of the fundamental shear horizontal guided wave by a part-thickness crack in an isotropic plate

Scattering of the fundamental shear horizontal mode in a plate when incident at a through crack aligned in the propagation direction of the mode

Journal	Data powered by TypesetAIP Conference Proceedings
Publisher	Data powered by TypesetAmerican Institute of Physics Inc.
ISSN	0094243X
Open Access	Yes