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Nonlinear ultrasonic stimulated thermography for damage assessment in isotropic fatigued structures

Fierro, Gian Piero Malfense, Calla, Danielle, Ginzburg, DMitri, Ciampa, Francesco and Meo, Michele (2017) Nonlinear ultrasonic stimulated thermography for damage assessment in isotropic fatigued structures JOURNAL OF SOUND AND VIBRATION, 404. pp. 102-115.

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Abstract

Traditional non-destructive evaluation (NDE) and structural health monitoring (SHM) systems are used to analyse that a structure is free of any harmful damage. However, these techniques still lack sensitivity to detect the presence of material micro-flaws in the form of fatigue damage and often require time-consuming procedures and expensive equipment. This research work presents a novel "nonlinear ultrasonic stimulated thermography" (NUST) method able to overcome some of the limitations of traditional linear ultrasonic/thermography NDE-SHM systems and to provide a reliable, rapid and cost effective estimation of fatigue damage in isotropic materials. Such a hybrid imaging approach combines the high sensitivity of nonlinear acoustic/ultrasonic techniques to detect micro-damage, with local defect frequency selection and infrared imaging. When exciting structures with an optimised frequency, nonlinear elastic waves are observed and higher frictional work at the fatigue damaged area is generated due to clapping and rubbing of the crack faces. This results in heat at cracked location that can be measured using an infrared camera. A Laser Vibrometer (LV) was used to evaluate the extent that individual frequency components contribute to the heating of the damage region by quantifying the out-of-plane velocity associated with the fundamental and second order harmonic responses. It was experimentally demonstrated the relationship between a nonlinear ultrasound parameter ( βratio) of the material nonlinear response to the actual temperature rises near the crack. These results demonstrated that heat generation at damaged regions could be amplified by exciting at frequencies that provide nonlinear responses, thus improving the imaging of material damage and the reliability of NUST in a quick and reproducible manner.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Fierro, Gian Piero Malfense
Calla, Danielle
Ginzburg, DMitri
Ciampa, Francescof.ciampa@surrey.ac.uk
Meo, Michele
Date : 15 September 2017
Funders : EPSRC - Engineering and Physical Sciences Research Council
DOI : 10.1016/j.jsv.2017.05.041
Copyright Disclaimer : © 2017 Elsevier Ltd
Uncontrolled Keywords : Thermosonics; Thermography; Nonlinear ultrasound; Laser vibrometer; LDR
Additional Information : Michele Meo would acknowledge the EU FP-7 “ALAMSA” project (grant agreement number 314768), whilst Francesco Ciampa would acknowledge the EPSRC “NUSIT” project (EP/N016386/1).
Depositing User : Diane Maxfield
Date Deposited : 16 Sep 2019 14:43
Last Modified : 16 Sep 2019 14:43
URI: http://epubs.surrey.ac.uk/id/eprint/852624

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