PSI - Issue 18

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 ScienceDirect

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ScienceDirect

Procedia Structural Integrity 18 (2019) 223–230

25th International Conference on Fracture and Structural Integrity Design and characterization of linear shape memory alloy actuator with modular stroke Girolamo Costanza a *, Neyara Radwan b,c , Maria Elisa Tata d , Emanuele Varone a a Industrial Engineering Department,University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy b Faculty of Economics & Administration, King AbdulazizUniversity, Jedda, Saudi Arabia c Mechanical Department,Faculty of Engineering, Suez Canal University, Egypt d Civil Engineering and Computer Science Department, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy Abstract In this work a novel actuation system based on NiTi shape memory springs has been designed and characterized in a small-scale prototype to permit setting of the right aperture and its modulation when necessary. The manufactured prototype exploits an actuator in the antagonist configuration. In particular, the aim has been focused on the modulation of the stroke by the activation of Shape Memory Alloy (SMA) actuators. SMA springs of 15 turns and 7.5 mm average diameter are the optimal solution relatively to force and stroke required from the system. One of the possible applications of such actuator is in the field of solar reactors in which one of the main problem is to keep constant temperature into the reactor in order to allow a continuous and efficient transformation, from sunrise to sunset. 25th International Conference on Fracture and Structural Integrity Design and characterizat on of line hap memory alloy actuator with modular stroke Girolamo Costanza a *, Neyara Radwan b,c , Maria Elisa Tata d , Emanuele Varone a a Industrial Engine ring Department,U iversity of Rome Tor Vergata, Vi del Polit cnico 1, 00133 Rome, Italy b Faculty of Economics & Administration, K ng AbdulazizUniversi y Jed a, Saudi Arabia c Mechanical Department,Faculty of Engineering, Suez Canal University, Egypt d Civil Engineering and Computer Science Department, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy Abstract I this work a novel actuation system based on NiTi shape memory spri gs has been designed and characterized in a small-scale prototype to permit setting of the right aperture and its modulation when necessary. The manufactured prot type exploits an actuator in the antagonist configuration. In particular, the aim has been focused on the modulation of the stroke by the activation of Shape Memory Alloy (SMA) actuators. SMA springs of 15 turns and 7.5 mm average diameter are the optimal solution relatively to force and stroke required from the system. One of the possible applications of such actuator is in the field of solar reactors in which one of the main problem is to keep constant temperature into the reactor in order to allow a continuous and efficient transformation, from sunrise to sunset.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. P er-review under responsibility of the Grupp Italian Frattura (IGF) ExCo. Keywords: Shape Memory Alloy, linear actuator, modular stroke, solar reactor.

Keywords: Shape Memory Alloy, linear actuator, modular stroke, solar reactor.

1. Introduction Shape memory alloys are a class of functional materials able to recover the preset shape just upon heating above a critical transformation temperature (Costanza et al. (2016)). Thanks to this ability they can be exploited as sensor, transducers or actuators for example in solar sailing, as testified by the published works: Boschetto et al. (2019), Costanza et al. (2018), Costanza et al. (2017). In SMA-based actuators one of the main problem regards the difficulty 1. Introduction Shape memory alloys are a class of functional materials able to recover the preset shape just upon heating above a critical transformation temperature (Costanza et al. (2016)). Thanks to this ability they can be exploited as sensor, transducers or actuators for example in solar sailing, as testified by the published works: Boschetto et al. (2019), Costanza et al. (2018), Costanza et al. (2017). In SMA-based actuators one of the main problem regards the difficulty

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. * Corresponding author. Tel.: +39 06 72597185; fax: +39 06 2021351 E-mail address: costanza@ing.uniroma2.it * Corresponding author. Tel.: +39 06 72597185; fax: +39 06 2021351 E-mail address: costanza@ing.uniroma2.it

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.157