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2016, vol. 44, br. 4, str. 380-385
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Nedistruktivna inspekcija laminata sa bazaltnim vlaknima nakon udara pri niskim brzinama
Basalt fibre laminates non-destructively inspected after low-velocity impacts
aLas.E.R. Laboratory, Department of Industrial and Information Engineering and Economics, University of L'Aquila, L'Aquila, Italy bComputer Vision and System Laboratory, Department of Electrical and Computer Engineering, Laval University, Quebec City, Canada cDepartment of Chemical Engineering Materials Environment, Sapienza-Università di Roma, Rome, Italy dSchool of Architecture and Design, University of Camerino, Ascoli Piceno, Italy eComputer Vision and System Laboratory, Department of Electrical and Computer Engineering, Quebec City, Canada
e-adresa: carlo.santulli@unicam.it
Sažetak
U ovom radu je ispitano korišćenje naprednih termo grafičkih tehnika za otkrivanje oštećenja posle udara u kompozitnim laminatima ojačanim bazaltnim vlaknima. Laminati su prethodno udareni različitom energijom, odnosno 7.5, 15 i 22,5 J a zatim podvrgnuti ubrzanom starenju sredine ili postupku oblaganja u cilju prikrivanja prethodnih oštećenja od udara pri niskim brzinama. U oba slučaja oštećenja se mogu identifikovati pomoću infracrvene termografije u srednjem talasnom infracrvenom spektru, čak i nakon tretmana. Pored toga, kratki infracrveni talasni rezultati su korišćeni sa ciljem da se jasno identifikuju sumnjive zone bogate smolom. Dakle, ne-termički deo infracrvenog spektra može da bude spojen sa termičkim delom tako da u van onoga što je primetno golim okom, tj u poptunosti može da obezbedi infracrvenu viziju vidljivom spektru.
Abstract
In this work, the use of advanced thermographic techniques for the post-impact defect detection in basalt fibre reinforced composite laminates was investigated. The laminates were previously impacted at different energies, namely 7.5, 15 and 22.5 J and then subjected to accelerated environmental aging or to a coating process in order to conceal the previous damage due to low velocity impact. In both cases the defects could be identified using infrared thermography in the mid-wave infrared (MWIR) spectrum even after the treatments. In addition, short-wave infrared (SWIR) results were employed with the aim to clearly identify unsuspected resin-rich areas. Therefore, the non-thermal part of the infrared spectrum (SWIR) can be coupled with the thermal part (MWIR) providing a complete infrared vision beyond what is perceptible to the naked eye, i.e., in the visible spectrum.
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