Acoustic Emission Response to Fatigue Damage of Additively Produced and Cast Materials

Kratochvilova, Vendula; Brno University of Technology; Czech Republic

Kratochvilova, V.; Brno University of Technology; Czech Republic
Vlasic, F.; Brno University of Technology; Czech Republic
Mazal, P.; Brno University of Technology; Czech Republic
Palousek, D.; Brno University of Technology; Czech Republic

ID: ECNDT-0320-2018
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Session: In-process monitoring for Additive Manufacturing
Room: H1
Date: 2018-06-13
Time: 14:30 - 14:50

Additive manufacturing (AM) or 3D printing technologies allows to produce parts with complicated shapes in a relatively short time and without big material waste. These parts are more and more used in different types of engineering construction. The latest studies are mainly aimed at improving the quality of the material produced by AM in order to achieve the same or better quality as conventional materials. It brings the need for testing of these materials.
Presented study evaluates and compares the fatigue processes of additively produced and cast materials using acoustic emission method. The used additive technology is the selective laser melting (SLM), which enables to produce metal parts. Tested materials are aluminium alloys AlSi9Cu3 and AlSi10Mg, which are commonly used in aluminium castings production. Both materials are tested in as-cast or as-built condition without any heat treatment. All samples were subjected to fatigue bending tests in high-cycle area and the results were evaluated by acoustic emission measurement. This allows a deep analysis of the fatigue process and compare the characteristics of both materials. The main goal is to analyse the acoustic emission response to fatigue damage and the correlation between this response and fracture mechanism.
Results shows that fatigue life of SLM material is better than casting material with same chemical composition. Acoustic emission detects stages of fatigue process and crack initiation and localization.