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Sensors 2015, 15(10), 26709-26725; doi:10.3390/s151026709

Evaluation of SHM System Produced by Additive Manufacturing via Acoustic Emission and Other NDT Methods

1
Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Pleinlaan 2, Brussels 1050, Belgium
2
Department of Mechanical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, Brussels 1050, Belgium
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 10 August 2015 / Revised: 3 October 2015 / Accepted: 13 October 2015 / Published: 21 October 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [956 KB, uploaded 22 October 2015]   |  

Abstract

During the last decades, structural health monitoring (SHM) systems are used in order to detect damage in structures. We have developed a novel structural health monitoring approach, the so-called “effective structural health monitoring” (eSHM) system. The current SHM system is incorporated into a metallic structure by means of additive manufacturing (AM) and has the possibility to advance life safety and reduce direct operative costs. It operates based on a network of capillaries that are integrated into an AM structure. The internal pressure of the capillaries is continuously monitored by a pressure sensor. When a crack nucleates and reaches the capillary, the internal pressure changes signifying the existence of the flaw. The main objective of this paper is to evaluate the crack detection capacity of the eSHM system and crack location accuracy by means of various non-destructive testing (NDT) techniques. During this study, detailed acoustic emission (AE) analysis was applied in AM materials for the first time in order to investigate if phenomena like the Kaiser effect and waveform parameters used in conventional metals can offer valuable insight into the damage accumulation of the AM structure as well. Liquid penetrant inspection, eddy current and radiography were also used in order to confirm the fatigue damage and indicate the damage location on un-notched four-point bending AM metallic specimens with an integrated eSHM system. It is shown that the eSHM system in combination with NDT can provide correct information on the damage condition of additive manufactured metals. View Full-Text
Keywords: acoustic emission; additive manufacturing; structural health monitoring; liquid penetrant inspection; radiography; eddy current acoustic emission; additive manufacturing; structural health monitoring; liquid penetrant inspection; radiography; eddy current
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Strantza, M.; Aggelis, D.G.; de Baere, D.; Guillaume, P.; van Hemelrijck, D. Evaluation of SHM System Produced by Additive Manufacturing via Acoustic Emission and Other NDT Methods. Sensors 2015, 15, 26709-26725.

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