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Patil, Sankalp
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article
Miniaturization of non-assembly metallic pin-joints by LPBF-based additive manufacturing as perfect pivots for pantographic metamaterials
Abstract
first_page settings Order Article Reprints Open AccessArticle Miniaturization of Non-Assembly Metallic Pin-Joints by LPBF-Based Additive Manufacturing as Perfect Pivots for Pantographic Metamaterials by Florian Gutmann 1,2,* [ORCID] , Maximilian Stilz 1, Sankalp Patil 1 [ORCID] , Frank Fischer 1, Klaus Hoschke 2 [ORCID] , Georg Ganzenmüller 1 [ORCID] and Stefan Hiermaier 1,2 [ORCID] 1 Department of Sustainable Systems Engineering—INATECH, Albert-Ludwigs-University Freiburg, Emmy-Noether-Straße 2, 79110 Freiburg, Germany 2 Fraunhofer Institute for High-Speed Dynamics (EMI), Ernst-Zermelo-Str. 4, 79104 Freiburg, Germany * Author to whom correspondence should be addressed. Materials 2023, 16(5), 1797; https://doi.org/10.3390/ma16051797 Received: 10 January 2023 / Revised: 7 February 2023 / Accepted: 16 February 2023 / Published: 22 February 2023 (This article belongs to the Special Issue Recent Advances in the Field of Mechanical Metamaterials and Their Associated Applications and Fabrication Techniques) Download Browse Figures Versions Notes Abstract This work introduced additively manufactured non-assembly, miniaturized pin-joints for pantographic metamaterials as perfect pivots. The titanium alloy Ti6Al4V was utilized with laser powder bed fusion technology. The pin-joints were produced using optimized process parameters required for manufacturing miniaturized joints, and they were printed at a particular angle to the build platform. Additionally, this process optimization will eliminate the requirement to geometrically compensate the computer-aided design model, allowing for even further miniaturization. In this work, pin-joint lattice structures known as pantographic metamaterials were taken into consideration. The mechanical behavior of the metamaterial was characterized by bias extension tests and cyclic fatigue experiments, showing superior levels of performance (no sign of fatigue for 100 cycles of an elongation of approximately 20%) in comparison to classic pantographic metamaterials made with rigid ...