The BCC unit cell for latticed SLM parts; mechanical properties as a function of cell size

Ian Maskery, Adedeji Aremu, Marco Simonelli, Chris Tuck, Ricky WIldman, Ian Ashcroft, Richard Hague

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

2 Citations (Scopus)

Abstract

The existing framework describing the mechanical properties of lattices places strong emphasis on one important property, the relative density of the repeating cells. In this work, we explore the effects of cell size, attempting to construct more complete models for the performance of lattices. This was achieved by examining the elastic modulus and ultimate tensile strength of latticed parts with a range of unit cell sizes and fixed density. The parts were produced by selective laser melting (SLM). The examined cell type was body-centred-cubic (BCC), a cell of high relevance for SLM because of its self-supporting structure. We obtained power law relationships for the mechanical properties of our latticed specimens as a function of cell size, which are similar in form to the existing laws for the density dependence. These can be used to predict the properties of latticed column structures comprised of BCC cells, and may be easily amended for other situations. In addition, we propose a novel way to analyse the elastic modulus data, which may lead to more general models, applicable to parts of varying size. Lastly, our general methodology may be of use in future studies which explore the other parameters that determine lattice performance; the choice of cell type, the global shape of the lattice structure and the type of stress.
Original languageEnglish
Title of host publication25th Solid Free Form Symposium
Place of PublicationUniversity of Texas, Austin
PublisherUniversity of Texas at Austin
Pages688-701
Number of pages4
Publication statusPublished - 2014
Externally publishedYes
EventThe Twenty-Fifth Annual International Solid Freeform Fabrication Symposium - Austin, United States
Duration: 4 Aug 20146 Aug 2014
Conference number: 25

Conference

ConferenceThe Twenty-Fifth Annual International Solid Freeform Fabrication Symposium
Abbreviated titleSFF
CountryUnited States
CityAustin
Period4/08/146/08/14

Bibliographical note

Manuscripts for this and all preceding SFF Symposia are available for free download at the conference website:
http://sffsymposium.engr.utexas.edu/archive.

Keywords

  • selective laser melting
  • lattice
  • aluminium alloy

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    Maskery, I., Aremu, A., Simonelli, M., Tuck, C., WIldman, R., Ashcroft, I., & Hague, R. (2014). The BCC unit cell for latticed SLM parts; mechanical properties as a function of cell size. In 25th Solid Free Form Symposium (pp. 688-701). University of Texas, Austin: University of Texas at Austin.