Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

Ablative materials are used extensively in the aerospace industry for protection against high thermal stresses and temperatures, an example being glass/silicone composites. The extreme conditions faced and the cost-risk related to the production/operating stage of such high-tech materials indicate t...

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Main Authors:	Stefano Laureti, Muhammad Khalid Rizwan, Hamed Malekmohammadi, Pietro Burrascano, Maurizio Natali, Luigi Torre, Marco Rallini, Ivan Puri, David Hutchins, Marco Ricci
Format:	Article
Language:	English
Published:	MDPI AG 2019-05-01
Series:	Sensors
Subjects:	polymeric ablative materials thermal protection system thermography ultrasonic testing pulse-compression
Online Access:	https://www.mdpi.com/1424-8220/19/9/2198

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spelling	doaj-ebcffd5a57fc46b9bf1f7123f7e57c642020-11-24T21:25:54ZengMDPI AGSensors1424-82202019-05-01199219810.3390/s19092198s19092198Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled UltrasoundStefano Laureti0Muhammad Khalid Rizwan1Hamed Malekmohammadi2Pietro Burrascano3Maurizio Natali4Luigi Torre5Marco Rallini6Ivan Puri7David Hutchins8Marco Ricci9Department of Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, ItalyDepartment of Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, ItalyDepartment of Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, ItalyDepartment of Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, ItalyDepartment of Civil and Environmental Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, ItalyDepartment of Civil and Environmental Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, ItalyDepartment of Civil and Environmental Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, ItalyDepartment of Civil and Environmental Engineering, University of Perugia, Polo Scientifico Didattico di Terni, Strada di Pentima 4, 05100 Terni, ItalySchool of Engineering, University of Warwick, Library Road, Coventry CV4 7AL, UKDepartment of Informatics, Modeling, Electronics and System Engineering, University of Calabria, 87036 Rende, ItalyAblative materials are used extensively in the aerospace industry for protection against high thermal stresses and temperatures, an example being glass/silicone composites. The extreme conditions faced and the cost-risk related to the production/operating stage of such high-tech materials indicate the importance of detecting any anomaly or defect arising from the manufacturing process. In this paper, two different non-destructive testing techniques, namely active thermography and ultrasonic testing, have been used to detect a delamination in a glass/silicone composite. It is shown that a frequency modulated chirp signal and pulse-compression can successfully be used in active thermography for detecting such a delamination. Moreover, the same type of input signal and post-processing can be used to generate an image using air-coupled ultrasound, and an interesting comparison between the two can be made to further characterise the defect.https://www.mdpi.com/1424-8220/19/9/2198polymeric ablative materialsthermal protection systemthermographyultrasonic testingpulse-compression
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Stefano Laureti Muhammad Khalid Rizwan Hamed Malekmohammadi Pietro Burrascano Maurizio Natali Luigi Torre Marco Rallini Ivan Puri David Hutchins Marco Ricci
spellingShingle	Stefano Laureti Muhammad Khalid Rizwan Hamed Malekmohammadi Pietro Burrascano Maurizio Natali Luigi Torre Marco Rallini Ivan Puri David Hutchins Marco Ricci Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound Sensors polymeric ablative materials thermal protection system thermography ultrasonic testing pulse-compression
author_facet	Stefano Laureti Muhammad Khalid Rizwan Hamed Malekmohammadi Pietro Burrascano Maurizio Natali Luigi Torre Marco Rallini Ivan Puri David Hutchins Marco Ricci
author_sort	Stefano Laureti
title	Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound
title_short	Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound
title_full	Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound
title_fullStr	Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound
title_full_unstemmed	Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound
title_sort	delamination detection in polymeric ablative materials using pulse-compression thermography and air-coupled ultrasound
publisher	MDPI AG
series	Sensors
issn	1424-8220
publishDate	2019-05-01
description	Ablative materials are used extensively in the aerospace industry for protection against high thermal stresses and temperatures, an example being glass/silicone composites. The extreme conditions faced and the cost-risk related to the production/operating stage of such high-tech materials indicate the importance of detecting any anomaly or defect arising from the manufacturing process. In this paper, two different non-destructive testing techniques, namely active thermography and ultrasonic testing, have been used to detect a delamination in a glass/silicone composite. It is shown that a frequency modulated chirp signal and pulse-compression can successfully be used in active thermography for detecting such a delamination. Moreover, the same type of input signal and post-processing can be used to generate an image using air-coupled ultrasound, and an interesting comparison between the two can be made to further characterise the defect.
topic	polymeric ablative materials thermal protection system thermography ultrasonic testing pulse-compression
url	https://www.mdpi.com/1424-8220/19/9/2198
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Delamination Detection in Polymeric Ablative Materials Using Pulse-Compression Thermography and Air-Coupled Ultrasound

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