Print Email Facebook Twitter Reversible shape morphing of a neutrally stable shell by untethered local activation of embedded Ni-Ti wires Title Reversible shape morphing of a neutrally stable shell by untethered local activation of embedded Ni-Ti wires Author van der Lans, Daan (Student TU Delft) Amoozandeh, A. (TU Delft Mechatronic Systems Design) Radaelli, G. (TU Delft Mechatronic Systems Design) Date 2023 Abstract This paper presents a novel shape morphing concept, which exploits neutral stability to achieve reversible shape morphing. The concept is based on actively changing the material stiffness on a local level in order to perturb the neutral stability and thus induce the shell to deform. This concept is realized by embedding Ni-Ti wires in a neutrally stable shell. These wires undergo a significant increase in stiffness upon being heated beyond their Austenite transition temperature. The wires are locally heated by forced convection. The results show that the shape of the shell can be controlled freely along the neutrally stable elastic deformation path by changing the location of the heat stimulus. In contrast to existing shape morphing structures, the presented structure is capable of fully reversible (two-way) shape morphing, while also preserving its shape after removing the stimulus. This allows for positioning without continuous actuation. The shell achieves a significant range of motion and, since the elastic deformation reaction forces do not need to be overcome, it is capable of generating actuation force. Since the actuation concept does not require a complex patterning of active materials to achieve the desired deformation, it can potentially also be applied to other neutrally stable structures. Subject compliant shellsembedded actuationneutral stabilityShape morphingvariable stiffness To reference this document use: http://resolver.tudelft.nl/uuid:7352ed87-6471-422c-8a7e-56552f57a500 DOI https://doi.org/10.1177/1045389X221151065 ISSN 1045-389X Source Journal of Intelligent Material Systems and Structures, 34 (14), 1664-1677 Part of collection Institutional Repository Document type journal article Rights © 2023 Daan van der Lans, A. Amoozandeh, G. Radaelli Files PDF van_der_lans_et_al_2023_r ... ion_of.pdf 3.45 MB Close viewer /islandora/object/uuid:7352ed87-6471-422c-8a7e-56552f57a500/datastream/OBJ/view