Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

An experimental and numerical evaluation of the mechanical properties and behavior of the kelvin lattice structure, made by SLM method

Authors
Reza Saremian
Ehsan Foroozmehr
Mohsen Badrossamay
Mahmood Kadkhodaie
Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran
10.30506/ijmep.2021.114578.1632
Abstract
Currently, with the advancement and development of the additive manufacturing technology
(AM), many studies are conducted to evaluate the behavior and mechanical properties of lattice
structures. Due to their ability to control mechanical properties, these structures have been
considered by researchers. In this paper, the properties and mechanical behavior of the kelvin
lattice structure were investigated experimentally and numerically. The intended structure is
316L stainless steel and is fabricated using the selective laser melting (SLM) method. The build
quality and mechanical properties of the kelvin lattice structure were evaluated. Build quality
was evaluated using the digital microscope and scanning electron microscope (SEM).
As well as to evaluate the behavior and mechanical properties of the kelvin lattice structure,
quasi-static compression test was performed. Finite element modeling was carried out to predict
the mechanical properties and behavior of the kelvin lattice structure. To do this, the unit cell
method was used. Based on the provided images, the kelvin lattice structure was fabricated
without defect and in accordance with the previously defined geometry. The experimental
compressive test results show the favorable mechanical properties, the ability to absorb energy,
and the excellent reproducibility of the fabricated lattice structures results. Finite element
modeling had a good agreement with experimental results which can be used to predict the
behavior and mechanical properties of the kelvin lattice structure with much less time and cost
than the experimental method.
Keywords
Kelvin lattice structure
Additive manufacturing
Selective laser melting
Finite element method. 316L
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  • Receive Date 20 September 2019
  • Revise Date 23 March 2020
  • Accept Date 15 February 2021