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DINAME2019
DINAME2019
Biomimetic thermomechanical cycling of a multi-utility shape memory alloy device
Submission Author:
Darren Hartl , Texas , United States
Co-Authors:
Darren Hartl, Pedro Batista Camara Leal
Presenter: Darren Hartl
doi://10.26678/ABCM.DINAME2019.DIN2019-0094
Abstract
An aircraft wing is a multifarious system composed of numerous specialized subsystems (e.g., ribs, spars, and flaps). An avian musculoskeletal system is similarly multi-utility, performing the tasks of an actuator, a brake, and a spring with variable compliance. Biomimicking these natural systems could yield effective solutions for complex engineering problems. This work proposes the use of shape memory alloy wires subject to electro-thermomechanical stimuli to reproduce the work-loops performed by a humerotriceps of a pigeon. The biomimicked actuation cycles are achieved for temperature-driven (temperature regulated via a thermal chamber) or voltage-driven (Joule heating and natural convection cooling) experiments, leading to responses that are compatible with a range of brake and actuator applications. Consequently, net positive volume-specific work-loops utilizing SMA wire components are demonstrated for the first time using this approach. Furthermore, a numerical model accurately representing the experiment is calibrated and used for further exploring the design domain enabled by the thermomechanically stimulated smart actuators
Keywords
Shape memory alloys (SMA), Thermomechanical Loads, Avian-inspired, Biomimicry
