Development of unit cell model for prediction of large deformation in SMA-textile base actuator

Muhammad Umar Elahi, Salman Khalid, Jinwoo Song, Heung Soo Kim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Shape memory alloys (SMA)-textile-based actuators have gained significant attention for their applications in various fields, including soft robotics and wearable devices. Nowadays, soft actuators are created using SMA and macro fiber composites (MFC). SMA is a highly nonlinear material, and textile fiber-wrapped SMA wires are employed to craft shape-morphing structures and actuation sheets through the knitting method. This process requires expertise and time, leading to high costs for producing an actuation sheet. In this research work, ABAQUS is utilized to construct an equivalent unit cell model based on linear constitutive equations for analyzing the behavior of knitted SMA-textile-based actuators. The actuation deformation of the P-loop is obtained using the user material subroutine (UMAT). Strain is the primary output focused on in this study, with elastic material properties and electric field as the input parameters. By incorporating the linear constitutive equations, the actuation of basic patterns and derived patterns is successfully compared with experimental results. The proposed model predicts a similar deformation of the actuation pattern sheets of the SMA-textile-based actuator, justifying the proposed equivalent unit cell model.

Original languageEnglish
Title of host publicationSoft Mechatronics and Wearable Systems
EditorsIlkwon Oh, Sang-Woo Kim, Maurizio Porfiri, Woon-Hong Yeo
PublisherSPIE
ISBN (Electronic)9781510672024
DOIs
StatePublished - 2024
EventSoft Mechatronics and Wearable Systems 2024 - Long Beach, United States
Duration: 25 Mar 202428 Mar 2024

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume12948
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceSoft Mechatronics and Wearable Systems 2024
Country/TerritoryUnited States
CityLong Beach
Period25/03/2428/03/24

Keywords

  • Constitutive model
  • SMA-Textile actuator
  • dielectric elastomers
  • equivalent unit cell model
  • large deformation
  • large deformation
  • mechanical behavior
  • soft actuator design
  • soft robotics

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