Notch fracture predictions using the Phase Field method for Ti-6Al-4V produced by Selective Laser Melting after different post-processing conditions
File(s)
Published version
Author(s)
Díaz, A
Alegre, JM
Cuesta, II
Martínez-Pañeda, E
Zhang, Z
Type
Journal Article
Abstract
Ti-6Al-4V is a titanium alloy with excellent properties for lightweight applications and its production through Additive Manufacturing processes is attractive for different industrial sectors. In this work, the influence of mechanical properties on the notch fracture resistance of Ti-6Al-4V produced by Selective Laser Melting is numerically investigated. Literature data is used to inform material behaviour. The as-built brittle behaviour is compared to the enhanced ductile response after heat treatment (HT) and hot isostatic pressing (HIP) post-processes. A Phase Field framework is adopted to capture damage nucleation and propagation from two different notch geometries and a discussion on the influence of fracture energy and the characteristic length is carried out. In addition, the influence of oxygen uptake is analysed by reproducing non-inert atmospheres during HT and HIP, showing that oxygen shifts fracture to brittle failures due to the formation of an alpha case layer, especially for the V-notch geometry. Results show that a pure elastic behaviour can be assumed for the as-built SLM condition, whereas elastic-plastic phenomena must be modelled for specimens subjected to heat treatment or hot isostatic pressing. The present brittle Phase Field framework coupled with an elastic-plastic constitutive analysis is demonstrated to be a robust prediction tool for notch fracture after different post-processing routes.
Date Issued
2022-10
Date Acceptance
2022-07-22
Citation
Theoretical and Applied Fracture Mechanics, 2022, 121, pp.1-10
ISSN
0167-8442
Publisher
Elsevier BV
Start Page
1
End Page
10
Journal / Book Title
Theoretical and Applied Fracture Mechanics
Volume
121
Copyright Statement
© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
License URL
Sponsor
Medical Research Council (MRC)
Identifier
https://www.sciencedirect.com/science/article/pii/S0167844222002555
Grant Number
MR/V024124/1
Subjects
0102 Applied Mathematics
0905 Civil Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status
Published
Article Number
103510
Date Publish Online
2022-07-26