Coupled Finite Element Simulation of Shape Memory Bending Microactuator
Tshikwand GK, Seigner L, Wendler F, Kohl M (2022)
Publication Type: Journal article
Publication year: 2022
Journal
DOI: 10.1007/s40830-022-00396-9
Abstract
Due to their high-energy density, shape memory alloys (SMAs) are investigated as material for bending microactuators in applications of self-folding structures, realizing the concept of programmable matter. Here, for the numerical prediction of the electro-thermo-mechanical performance, the quantification of the time-dependent coupling effects in SMA materials during phase transformation is of crucial interest. Isothermal SMA material models cannot treat the time-dependent interaction between deformation, temperature and electric potential in thermally controlled actuation. In this paper, we extend an isothermal SMA model using standard thermodynamics (Coleman-Noll procedure) to treat the time-dependent behavior of polycrystalline SMAs. The model is implemented as a user material subroutine (UMAT) in a standard finite element (FE) code (Abaqus standard). The time-dependent loading of a tensile sample and a bending microactuator made from 20 lm thick SMA foil are simulated. A comparative study between experimental and simulation results on the thermoelastic and caloric effects during stress-induced phase transformation is presented. Joule heating simulations for shape recovery during both tensile and bending loading are conducted. Time-resolved temperature variations accompanying the loading and Joule heating processes are reported. The coupled SMA material model is found to be capable of approximating the timedependent field quantities of a polycrystalline SMA microactuator subjected to electro-thermo-mechanical loading.
Authors with CRIS profile
Georgino Kaleng Tshikwand
Lehrstuhl für Werkstoffsimulation
Frank Wendler
Lehrstuhl für Werkstoffsimulation
Involved external institutions
Germany (DE)How to cite
APA:
Tshikwand, G.K., Seigner, L., Wendler, F., & Kohl, M. (2022). Coupled Finite Element Simulation of Shape Memory Bending Microactuator. Shape Memory and Superelasticity. https://dx.doi.org/10.1007/s40830-022-00396-9
MLA:
Tshikwand, Georgino Kaleng, et al. "Coupled Finite Element Simulation of Shape Memory Bending Microactuator." Shape Memory and Superelasticity (2022).
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