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Modeling large deformations of thin-walled SMA structures by shell finite elements
Porenta, Luka (Avtor), Lavrenčič, Marko (Avtor), Dujc, Jaka (Avtor), Brojan, Miha (Avtor), Tušek, Jaka (Avtor), Brank, Boštjan (Avtor)

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Izvleček
Many shape memory alloy (SMA) applications, such as biomedical devices, electromechanical actuators, and elastocaloric cooling devices, are based on thin-walled flat or shell-like structures. An advanced design of such structures requires the development of an efficient and accurate numerical tool for simulations of very thin and curved SMA structures that may experience large deformations and even buckling upon thermo-mechanical loading. So far, finite element models for finite strain deformations of SMA structures have been based on 3D solid formulations, which are relatively inefficient for solving (thin) shell problems. In this paper, we present a finite element model for the analysis of shape memory alloy shells. Our model is based on a 7-parameter, large-rotation, one-director shell formulation, which takes into account a fully three-dimensional form of the constitutive equations for the isothermal transformations of isotropic superelasticity, as well as the shape-memory effect in a simplified way. In fact, we present three 4-node shell finite elements for SMAs. Two of them use the assumed natural strain concepts for the transverse shear strains, through-the-thickness normal strain, and membrane strains. The third element is a combination of the assumed natural strain and the enhanced assumed strain concepts, applied to satisfy the zero through-the-thickness-normal-stress condition for thin geometries to a high degree of accuracy. After a detailed description of the SMA finite element models for shells in the first part of the paper, numerical examples in the second part illustrate the approach. Compared to 3D solid SMA formulations, our results show excellent accuracy, even with a significantly reduced number of degrees of freedom, which consequently translates into a reduction in the computational time.

Jezik:Angleški jezik
Ključne besede:smart memory alloys, superlasticity, large strains, thin-walled structures, finite strains, seven-parameter shell model
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2021
Poslano v recenzijo:16.02.2021
Datum sprejetja članka:17.05.2021
Datum objave članka:01.10.2021
Št. strani:Str. 1-38
Številčenje:Vol. 101, art. 105897
UDK:539.37
ISSN pri članku:1007-5704
DOI:10.1016/j.cnsns.2021.105897 Povezava se odpre v novem oknu
COBISS.SI-ID:64322307 Povezava se odpre v novem oknu
Število ogledov:377
Število prenosov:61
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Gradivo je del revije

Naslov:Communications in Nonlinear Science and Numerical Simulation
Založnik:Elsevier
ISSN:1007-5704
COBISS.SI-ID:1454101 Povezava se odpre v novem oknu

Gradivo je financirano iz projekta

Financer:EC - European Commission
Program financ.:H2020
Številka projekta:803669
Naslov:Superelastic Porous Structures for Efficient Elastocaloric Cooling
Akronim:SUPERCOOL

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:J2-1722
Naslov:Numerično modeliranje širjenja razpok v krhkih in duktilnih konstrukcijah

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:J2-2490
Naslov:Podatkovno podprto modeliranje obnašanja gradbenih konstrukcij

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:28.05.2021

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:zlitine z oblikovnim spominom, superelastičnost, velike specifične deformacije

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