Elastoplastic response of as-built SLM and wrought Ti-6Al-4V under symmetric and asymmetric strain-controlled cyclic loading

Agius, D, Kourousis, K and Wallbrink, C 2018, 'Elastoplastic response of as-built SLM and wrought Ti-6Al-4V under symmetric and asymmetric strain-controlled cyclic loading', Rapid Prototyping Journal, vol. 24, no. 9, pp. 1409-1420.


Document type: Journal Article
Collection: Journal Articles

Title Elastoplastic response of as-built SLM and wrought Ti-6Al-4V under symmetric and asymmetric strain-controlled cyclic loading
Author(s) Agius, D
Kourousis, K
Wallbrink, C
Year 2018
Journal name Rapid Prototyping Journal
Volume number 24
Issue number 9
Start page 1409
End page 1420
Total pages 12
Publisher Emerald Group Publishing Ltd.
Abstract Purpose: The purpose of this paper is to examine the mechanical behaviour of additively manufactured Ti-6Al-4V under cyclic loading. Using as-built selective laser melting (SLM) Ti-6Al-4V in engineering applications requires a detailed understanding of its elastoplastic behaviour. This preliminary study intends to create a better understanding on the cyclic plasticity phenomena exhibited by this material under symmetric and asymmetric strain-controlled cyclic loading. Design/methodology/approach: This paper investigates experimentally the cyclic elastoplastic behaviour of as-built SLM Ti-6Al-4V under symmetric and asymmetric strain-controlled loading histories and compares it to that of wrought Ti-6Al-4V. Moreover, a plasticity model has been customised to simulate effectively the mechanical behaviour of the as-built SLM Ti-6Al-4V. This model is formulated to account for the SLM Ti-6Al-4V-specific characteristics, under the strain-controlled experiments. Findings: The elastoplastic behaviour of the as-built SLM Ti-6Al-4V has been compared to that of the wrought material, enabling characterisation of the cyclic transient phenomena under symmetric and asymmetric strain-controlled loadings. The test results have identified a difference in the strain-controlled cyclic phenomena in the as-build SLM Ti-6Al-4V when compared to its wrought counterpart, because of a difference in their microstructure. The plasticity model offers accurate simulation of the observed experimental behaviour in the SLM material. Research limitations/implications: Further investigation through a more extensive test campaign involving a wider set of strain-controlled loading cases, including multiaxial (biaxial) histories, is required for a more complete characterisation of the material performance. Originality/value: The present investigation offers an advancement in the knowledge of cyclic transient effects exhibited by a typical α martensite SLM Ti-6Al-4V under symmetric and asymmetric strain-c
Subject Materials Engineering not elsewhere classified
Keyword(s) Advanced manufacturing technologies
Mechanical properties
Mechanical properties of materials
Titanium
Modelling
Tests
DOI - identifier 10.1108/rpj-05-2017-0105
Copyright notice © Emerald Publishing Limited
ISSN 1355-2546
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