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Materials 2016, 9(2), 106; doi:10.3390/ma9020106

Fatigue of Ti6Al4V Structural Health Monitoring Systems Produced by Selective Laser Melting

1
Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Brussels 1050, Belgium
2
Department of Materials Science and Engineering, Ghent University, Gent 9000, Belgium
3
Department of Mechanical Engineering, Vrije Universiteit Brussel, Brussels 1050, Belgium
4
Department of Materials Engineering, KU Leuven, Leuven 3001, Belgium
5
Department of Electrochemical and Surface Engineering, Vrije Universiteit Brussel, Brussels 1050, Belgium
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 20 December 2015 / Accepted: 25 January 2016 / Published: 11 February 2016
(This article belongs to the Special Issue Failure Analysis in Materials)
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Abstract

Selective laser melting (SLM) is an additive manufacturing (AM) process which is used for producing metallic components. Currently, the integrity of components produced by SLM is in need of improvement due to residual stresses and unknown fracture behavior. Titanium alloys produced by AM are capable candidates for applications in aerospace and industrial fields due to their fracture resistance, fatigue behavior and corrosion resistance. On the other hand, structural health monitoring (SHM) system technologies are promising and requested from the industry. SHM systems can monitor the integrity of a structure and during the last decades the research has primarily been influenced by bionic engineering. In that aspect a new philosophy for SHM has been developed: the so-called effective structural health monitoring (eSHM) system. The current system uses the design freedom provided by AM. The working principle of the system is based on crack detection by means of a network of capillaries that are integrated in a structure. The main objective of this research is to evaluate the functionality of Ti6Al4V produced by the SLM process in the novel SHM system and to confirm that the eSHM system can successfully detect cracks in SLM components. In this study four-point bending fatigue tests on Ti6Al4V SLM specimens with an integrated SHM system were conducted. Fractographic analysis was performed after the final failure, while finite element simulations were used in order to determine the stress distribution in the capillary region and on the component. It was proven that the SHM system does not influence the crack initiation behavior during fatigue. The results highlight the effectiveness of the eSHM on SLM components, which can potentially be used by industrial and aerospace applications. View Full-Text
Keywords: selective laser melting; titanium alloy; structural health monitoring; fatigue; fractography selective laser melting; titanium alloy; structural health monitoring; fatigue; fractography
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.; Vafadari, R.; de Baere, D.; Vrancken, B.; van Paepegem, W.; Vandendael, I.; Terryn, H.; Guillaume, P.; van Hemelrijck, D. Fatigue of Ti6Al4V Structural Health Monitoring Systems Produced by Selective Laser Melting. Materials 2016, 9, 106.

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