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Optimal Design and Manufacture of Active Rod Structures with Spatially Variable Materials

Weeger, Oliver ; Kang, Yue Sheng Benjamin ; Yeung, Sai-Kit ; Dunn, Martin L. (2022):
Optimal Design and Manufacture of Active Rod Structures with Spatially Variable Materials. (Postprint)
In: 3D Printing and Additive Manufacturing, 3 (4), Mary Ann Liebert, Inc., ISSN 2329-7662, e-ISSN 2329-7670,
DOI: 10.26083/tuprints-00019827,
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Item Type: Article
Origin: Secondary publication service
Status: Postprint
Title: Optimal Design and Manufacture of Active Rod Structures with Spatially Variable Materials
Language: English
Abstract:

We present a design optimization and manufacturing approach for the creation of complex three-dimensional (3D) curved rod structures with spatially variable material distributions that exhibit active deformation behavior, enabled by the shape memory effect (SME) of 3D printed photopolymers—so-called four-dimensional (4D) printing. Our framework optimizes the cross-sectional properties of a rod structure, in particular the Young's modulus, such that under given loading conditions it can obtain one or more target shapes resulting from geometrically nonlinear deformation, from which the structure can then actively deform back to the original shape due to the SME. Our approach includes a novel algorithm to generate physical realizations from the computational design model, which allows their direct fabrication via printing of shape memory composites with voxel-level compositional control with a multi-material 3D printer. Our design and manufacture digital toolchain allows the continuous variation of multiple active materials as a route to optimize mechanical as well as active behavior of a structure, without changing the original shape of the 3D rod structure, which is not possible with a single material. We demonstrate the entire design-fabrication-test approach and illustrate its capabilities with examples including 3D characters, personalized medical applications, and complex structures that exhibit instabilities during their nonlinear deformation.

Journal or Publication Title: 3D Printing and Additive Manufacturing
Journal volume: 3
Number: 4
Publisher: Mary Ann Liebert, Inc.
Collation: 11 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Cyber-Physical Simulation (CPS)
Date Deposited: 07 Jan 2022 13:53
Last Modified: 07 Jan 2022 13:53
DOI: 10.26083/tuprints-00019827
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-198271
Additional Information:

Keywords: 4D printing, active structures, design optimization, functionally graded materials, multi-material 3D printing, voxel control of material properties

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19827
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