Effect of powder bed fusion laser melting process parameters, build orientation and strut thickness on porosity, accuracy and tensile properties of an auxetic structure in IN718 alloy
Journal article
Bahi, S., Gunputh, U., Rusinek, A., Wood, P. and Miguelez, M.H. 2020. Effect of powder bed fusion laser melting process parameters, build orientation and strut thickness on porosity, accuracy and tensile properties of an auxetic structure in IN718 alloy. Additive Manufacturing. 36, p. 101339. https://doi.org/10.1016/j.addma.2020.101339
| Authors | Bahi, S., Gunputh, U., Rusinek, A., Wood, P. and Miguelez, M.H. |
|---|---|
| Abstract | In this paper the geometry of an auxetic, re-entrant honeycomb structure made from Inconel 718 (IN718), was optimised with respect to the process parameters of laser melting process using a Renishaw AM250 after which the quasi static behaviour was analysed under tensile loading. Two different PBF process parameters were used with 2 different laser energy densities to manufacture the auxetic structures with 3 different strut thicknesses (0.3, 0.6 and 0.9 mm) in 2 building orientations (XY and ZX plane). A strut thickness of 0.6 mm was found to have the least porosity and the best dimensional accuracy. The latter geometry was then manufactured as part of a tensile test sample which were then tested at a strain rate of 0.001 s−1 after which the stress strain curve, yield stress, structural stiffness, plastic work and Poisson's Ratio were compared. The building directions XY, ZX and XZ of the auxetic structure were investigated, as well as the orientation of the individual cells with respect to the loading direction. XY was found to provide the best mechanical properties and the kinematics of deformation was found to be dependent on the loading direction with respect to the cells direction which resulted in a significant change in Poisson's ratio. Finite Element Analysis was also done in order to compare the stress strain curves and the deformation mode obtained from numerical modelling and experiment, and a good agreement was observed. |
| Keywords | Auxetic; Tensile test; Powder bed fusion; Experiment; Inconel 718 |
| Year | 2020 |
| Journal | Additive Manufacturing |
| Journal citation | 36, p. 101339 |
| Publisher | Elsevier |
| ISSN | 22148604 |
| Digital Object Identifier (DOI) | https://doi.org/10.1016/j.addma.2020.101339 |
| Web address (URL) | https://www.sciencedirect.com/science/article/pii/S2214860420307119?via%3Dihub |
| hdl:10545/625093 | |
| Output status | Published |
| Publication dates | 26 Jun 2020 |
| Publication process dates | |
| Deposited | 14 Aug 2020, 14:11 |
| Accepted | 17 May 2020 |
| Rights | © 2020 Elsevier B.V. All rights reserved. |
Attribution-NonCommercial-NoDerivatives 4.0 International | |
| Contributors | Laboratory of Microstructure Studies and Mechanics of Materials, UMR-CNRS, Department of Mechanical Engineering, University Carlos III of Madrid and Institute for Innovation in Sustainable Engineering, University of Derby |
| File | File Access Level Restricted |
| File | File Access Level Restricted |
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