Abstract : The main goal of this paper is to propose some analytical or pseudo-analytical tools facilitating the study and modeling of SMA helical spring-based actuators. Particular attention is paid to R-phase SMA helical spring-based actuators (i.e., springs made in NiTi and concerned by R-phase transformation phenomena). First, simplified models (i.e., based on beam theory framework) of R-phase SMA helical springs taking into account detwinning and assisted two-way memory effect are proposed and validated. Then, these models are used to determine the thermo-mechanical behavior of a linear bias-spring actuator. An actuator is built and used to validate the proposed models.
https://hal-ensta-bretagne.archives-ouvertes.fr/hal-02090256 Contributor : Accord Elsevier CCSDConnect in order to contact the contributor Submitted on : Friday, October 22, 2021 - 12:02:20 PM Last modification on : Wednesday, March 16, 2022 - 3:44:20 AM Long-term archiving on: : Sunday, January 23, 2022 - 7:34:49 PM