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Digital Design and Nonlinear Simulation for Additive Manufacturing of Soft Lattice Structures

Weeger, Oliver ; Narasimha, Boddeti ; Yeung, Sai Kit ; Kaijima, Sawako ; Dunn, Martin L. (2021):
Digital Design and Nonlinear Simulation for Additive Manufacturing of Soft Lattice Structures. (Postprint)
In: Additive Manufacturing, 25, Elsevier, ISSN 2214-8604,
DOI: 10.26083/tuprints-00019864,
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Item Type: Article
Origin: Secondary publication service
Status: Postprint
Title: Digital Design and Nonlinear Simulation for Additive Manufacturing of Soft Lattice Structures
Language: English
Abstract:

Lattice structures are frequently found in nature and engineering due to their myriad attractive properties, with applications ranging from molecular to architectural scales. Lattices have also become a key concept in additive manufacturing, which enables precise fabrication of complex lattices that would not be possible otherwise. While design and simulation tools for stiff lattices are common, here we present a digital design and nonlinear simulation approach for additive manufacturing of soft lattices structures subject to large deformations and instabilities, for which applications in soft robotics, healthcare, personal protection, energy absorption, fashion and design are rapidly emerging. Our framework enables design of soft lattices with curved members conforming to freeform geometries, and with variable, gradually changing member thickness and material, allowing the local control of stiffness. We model the lattice members as 3D curved rods and using a spline-based isogeometric method that allows the efficient simulation of nonlinear, large deformation behavior of these structures directly from the CAD geometries. Furthermore, we enhance the formulation with a new joint stiffening approach, which is based on parameters derived from the actual node geometries. Simulation results are verified against experiments with soft lattices realized by PolyJet multi-material polymer 3D printing, highlighting the potential for simulation-driven, digital design and application of non-uniform and curved soft lattice structures.

Journal or Publication Title: Additive Manufacturing
Journal volume: 25
Publisher: Elsevier
Collation: 26 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
Divisions: 16 Department of Mechanical Engineering > Cyber-Physical Simulation (CPS)
Date Deposited: 15 Dec 2021 13:46
Last Modified: 15 Dec 2021 13:46
DOI: 10.26083/tuprints-00019864
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-198642
Additional Information:

Lattices, Digital design, Multi-material 3D printing, Soft structures, Functionally graded structures, Nonlinear rods

URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19864
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