Characterisation and constitutive model of tensile properties of selective laser melted Ti-6Al-4V struts for microlattice structures

Wang, Z. and Li, P. (2018) Characterisation and constitutive model of tensile properties of selective laser melted Ti-6Al-4V struts for microlattice structures. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 725, pp. 350-358. (doi:10.1016/j.msea.2018.04.006)

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Abstract

Predicting the mechanical performance of selective laser melted (SLM) microlattice structures requires the constitutive data of the parent solid material in the struts. This work first characterised the cross-sectional features of individual SLM Ti-6Al-4V struts. The direct examination revealed the non-linear relation between the equivalent diameter and the Feret diameter of a strut, which was quantified by an empirical equation. The equation considering surface roughness effects allowed the non-destructive determination of the equivalent diameter using the directly measured Feret diameter prior to tension testing. Uniaxial tension experiments were then performed to accurately measure the constitutive behaviour of SLM Ti-6Al-4V struts, with the strain history tracked and recorded using high resolution imaging. It was found that the strut diameter ranging 300–1200 µm has a negligible effect on the stress–strain response. The strain hardening and fracture behaviour of the SLM Ti-6Al-4V can be quantitatively described using the Johnson–Cook models with damage. The constitutive models were finally validated by the 3D finite element model and experiments of uniaxial compression on an SLM microlattice structure. The methodology presented here can accurately characterise and formulate the constitutive behaviour of SLM metallic struts for microlattices.

Item Type:Articles
Additional Information:The authors gratefully acknowledge the financial support of Academic Research Fund (AcRF) Tier 1 by Ministry of Education, Singapore (Grant nos.: RG122/14 and RG175/15).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Dr Peifeng and Wang, Zhixiao
Authors: Wang, Z., and Li, P.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
College of Social Sciences
Journal Name:Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
Publisher:Elsevier
ISSN:0921-5093
ISSN (Online):0921-5093
Published Online:04 April 2018
Copyright Holders:Copyright © 2018 Elsevier B.V.
First Published:First published in Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing 725:350-358
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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