Quantification of defects in an aluminum plate using direction-tunable shear horizontal wave imaging

Mubarak Ahmad,Wenshuo Jiang,Cunfu He,Zenghua Liu,Abdul Basit,Wu Bin,L Zhang,W Chu,S Defilla

doi:10.1051/e3sconf/202123304030

Abstract

The quantification of damage, in plates, pipes and such like structures, is one of the current research areas. In this study, to estimate the notch size, shape, and orientation was carried out experimentally based on fundamental shear horizontal mode, SH0 mode. Using least number of transmitters, the reconstruction algorithm for the probabilistic inspection of damage (RAPID) has been used to carry out fast and efficient investigation of scattered waves using SH0wave interaction with notch at various incident angles. An approach of ultrasonic guided waves and (RAPID) algorithm, using a direction-tunable shear-horizontal mode array magnetostrictive patch transducer (DT-SHMA-MPT), the notch in a thin aluminum plate is experimented. Firstly, the RAPID algorithm, based on SH0mode, is used here to quantitatively study a notch in a thin aluminium plate. Secondly, the imaging application using DT-SHMA-MPT is achieved. Experiments were conducted using an array of eight DT-SHMA-MPTs based on a pitch-catch mode to utilize the scattered waves at the notch. The results obtained through experiments reveal the effect of directionality of the scattered waves and have find out the optimal transducers configuration. The localization, quantification and orientation at the same time are obtained using only two or three transmitters. To improve the accuracy of imaging, a threshold value was selected. The presented approach can be used to detect, locate and image the surface defects in aluminum plate.

Highlights

For the inspection of plate and plate like structures, shear-horizontal (SH) guided wave is one of the basic methods, where the fundamental SH0 mode is widely used in various fields [1,2,3,4,5]
As a magnetic field is required for the generation and reception of ultrasonic waves in the inspecting material, it is often required as a kind of electromagnetic acoustic transducer (EMAT)
Experiments were performed at different incident angles of (0°, 45°, and 90°) to the notch using SH0 mode

Summary

Introduction

For the inspection of plate and plate like structures, shear-horizontal (SH) guided wave is one of the basic methods, where the fundamental SH0 mode is widely used in various fields [1,2,3,4,5]. As a magnetic field is required for the generation and reception of ultrasonic waves in the inspecting material, it is often required as a kind of EMAT. Magnetostriction and Lorentz force both are generated in the structure when a magnetic field is applied, where the former is dominant phenomena. For the inspection of non-ferromagnetic material or having a high transduction efficiency, nickel patches can be employed for magnetostrictive patch transducers (MPTs) [16]. Based on magnetostriction the directed SH0 mode can be generated with the use of a figure-of eight coil to change the angle between coil and magnet [15]. This work has a direction-tunable shearhorizontal mode array magnetostrictive patch transducer (DT-SHMA-MPT) for the inspection of aluminum plate [42]. The DT-SHMA-MPT detects the signal with a wider range as compared to the directional transducer

RAPID imaging algorithm

DT-SHMA-MPT

Experimental setup

Scattered waveforms for the pitch-catch mode

Results

Conclusion