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Influence of the Miniaturisation Effect on the Effective Stiffness of Lattice Structures in Additive Manufacturing

Meyer, Guillaume ; Brenne, Florian ; Niendorf, Thomas ; Mittelstedt, Christian (2023)
Influence of the Miniaturisation Effect on the Effective Stiffness of Lattice Structures in Additive Manufacturing.
In: Metals, 2020, 10 (11)
doi: 10.26083/tuprints-00016184
Article, Secondary publication, Publisher's Version

Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

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Item Type: Article
Type of entry: Secondary publication
Title: Influence of the Miniaturisation Effect on the Effective Stiffness of Lattice Structures in Additive Manufacturing
Language: English
Date: 21 November 2023
Place of Publication: Darmstadt
Year of primary publication: 2020
Place of primary publication: Basel
Publisher: MDPI
Journal or Publication Title: Metals
Volume of the journal: 10
Issue Number: 11
Collation: 18 Seiten
DOI: 10.26083/tuprints-00016184
Corresponding Links:
Origin: Secondary publication DeepGreen

Thin-walled and cellular structures are characterised by superior lightweight potential due to their advantageous stiffness to weight ratio. They find particular interest in the field of additive manufacturing due to robust and reproducible manufacturability. However, the mechanical performance of such structures strongly depends on the manufacturing process and resultant geometrical imperfections such as porosity, deviations in strut thickness or surface roughness, for which an understanding of their influence is crucially needed. So far, many authors conducted empirical investigations, while analytical methods are rarely applied. In order to obtain efficient design rules considering both mechanical properties and process induced characteristics, analytical descriptions are desirable though. Available analytical models for the determination of effective properties are mostly based on the simple advancement of beam theories, mostly ignoring manufacturing characteristics that, however, strongly influence the mechanical properties of additive manufactured thin-walled structures. One example is the miniaturisation effect, a microstructural effect that has been identified as one of the main drivers of the effective elasto-plastic properties of lightweight structures processed by additive manufacturing. The current work highlights the need to quantify further microstructural effects and to encourage combining them into mesostructural approaches in order to assess macrostructural effective properties. This multi-scale analysis of lattice structures is performed through a comparison between effective stiffness calculated through an analytical approach and compression tests of lattice structures, coupled with an investigation of the arrangement of their struts. In order to cover different potential loading scenarios, bending-dominated and stretch-dominated lattice structures made of the commonly used materials 316L and Ti6Al4V are considered, whereby the impact of microstructural phase transformation during processing is taken into account

Uncontrolled Keywords: additive manufacturing, lightweight design, lattice structures, miniaturisation effect, microstructure
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-161846
Additional Information:

This article belongs to the Special Issue Additive Manufacturing of Cellular Structures Based on Metal Materials

Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering > Institute for Lightweight Construction and Design-KluB (2023 renamed in Leichtbau und Strukturmechanik (LSM))
Date Deposited: 21 Nov 2023 13:58
Last Modified: 23 Nov 2023 12:57
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/16184
PPN: 513393684
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