Shape-locking in architected materials through 3D printed magnetically activated joints

de Jong, P.H.; Salvatori, Y.S.; Libonati, F.; Mirzaali, Mohammad J.; Zadpoor, A.A.

doi:10.1016/j.matdes.2023.112427

Shape-locking in architected materials through 3D printed magnetically activated joints

Title

Shape-locking in architected materials through 3D printed magnetically activated joints

Author

de Jong, P.H. (TU Delft Support Biomechanical Engineering; TU Delft Biomaterials & Tissue Biomechanics)
Salvatori, Y.S. (University of Genova)
Libonati, F. (University of Genova)
Mirzaali, Mohammad J. (TU Delft Biomaterials & Tissue Biomechanics)
Zadpoor, A.A. (TU Delft Biomaterials & Tissue Biomechanics)

Date

2023-11

Abstract

Shape morphing is the ability of objects to adapt to different shapes and reduce stress concentrations through increased contact area. This is a common trait of natural and engineered objects and has several applications in, among others, soft robotics and orthopedic implants. Shape morphing is achieved through flexible materials or rigid components with either kinematic or compliant joints. An additional step, namely shape locking, is needed for sustained load support. Activation of a locking mechanism can be done with any energy, among which magnetism is one. Here, we present the implementation of a magnetic locking mechanism for kinematically deformable metamaterial structures that maintain shape and support loads upon locking. The structure consists of 3D printed rigid magnetic and non-magnetic components connected by hinges. We created several prototypes of the proposed designs using two additive manufacturing methods (i.e., material extrusion and multi-material jetting) and demonstrated its application in a closed-loop grid for arbitrary shapes. Moreover, we characterized the performance of the prototypes using mechanical tests and multibody kinematic system simulations. This work highlights the viability of the locking concept and provides design considerations for future applications. Further improvement and optimizations are needed for increased efficiency and effectiveness.

Subject

3D printing
Kinematic fixation
Locking mechanism
Magnetism
Shape morphing

To reference this document use:

http://resolver.tudelft.nl/uuid:d1c6502f-2240-4d91-be93-0c761eee67ee

DOI

https://doi.org/10.1016/j.matdes.2023.112427

ISSN

0264-1275

Source

Materials & Design, 235

Part of collection

Institutional Repository