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Special Issue "Shape Memory Alloys (SMAs) for Engineering Applications"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 30 November 2019

Special Issue Editors

Guest Editor
Prof. Dr. Masoud Motavalli

Structural Engineering Laboratory, Empa Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
Website | E-Mail
Phone: +41 58 765 4116
Interests: application of advanced materials (such as fiber-reinforced polymer composites and shape memory alloys in civil engineering); structural rehabilitation and repair; seismic retrofitting; large and full scale laboratory and field experiments
Guest Editor
Dr. Christoph Czaderski

Structural Engineering Laboratory, Empa Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
Website | E-Mail
Interests: strengthening of reinforced concrete with CFRP (Carbon Fibre Reinforced Polymers), prestressed CFRP, and shape Memory Alloys (SMA) for usage in building industry
Guest Editor
Prof. Dr. Moslem Shahverdi

Structural Engineering Laboratory, Empa Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
Website | E-Mail
Interests: shape memory alloys, fatigue and fracture mechanics, composite materials, solid mechanics, reinforced concrete, lightweight structures, numerical simulations, and field experiments

Special Issue Information

Dear Colleagues,

This Special Issue of Materials is dedicated to “Shape Memory Alloys (SMAs) for Engineering Applications”. We are expecting to receive papers dealing with cutting-edge issues on research and application of SMAs in structural engineering. The topics of the Special Issue include, but are not limited to:

  1. Alloy designing of SMAs for structural engineering including:
    1. Nickel-titanium-based SMAs
    2. Copper-based SMAs
    3. Iron-based SMAs
    4. Aluminum-based SMAs
  2. Applications of SMAs for structural engineering using:
    1. Damping capacity of SMAs
    2. Superelasticity of SMAs
  3. Applications in structural engineering using shape memory effect of SMAs for tensioning applications as:
    1. Coupling, Fastener
    2. Tendon
    3. Concrete reinforcement
    4. Near surface mounted reinforcement
    5. Short fibers
  4. Actuator applications of SMAs in structural engineering
  5. Active vibration control in structural engineering using SMAs
  6. Hybrid composites of shape memory alloys and polymers for structural engineering
  7. SMAs as sensors for health monitoring of structural engineering
  8. Modeling of the SMAs applications in structural engineering including
    1. Material constitutive models
    2. Structural behavior models
    3. Long term behavior models

Prof. Dr. Masoud Motavalli
Dr. Christoph Czaderski
Prof. Dr. Moslem Shahverdi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • shape memory alloys (SMAs)
  • shape memory effect (SME)
  • superelasticity
  • modeling
  • alloy design
  • structural engineering
  • civil engineering
  • smart materials
  • external strengthening
  • structural rehabilitation
  • constitutive models
  • long term behavior

Published Papers (2 papers)

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Research

Open AccessArticle Strengthening of Reinforced Concrete Beams with Externally Mounted Sequentially Activated Iron-Based Shape Memory Alloys
Materials 2019, 12(3), 345; https://doi.org/10.3390/ma12030345
Received: 30 November 2018 / Revised: 16 January 2019 / Accepted: 18 January 2019 / Published: 22 January 2019
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Abstract
Iron based shape memory alloys (Fe-SMA) have recently been used as active flexural strengthening material for reinforced concrete (RC) beams. Fe-SMAs are characterized by a shape memory effect (SME) which allows the recovery of previously induced plastic deformations through heating. If these deformations [...] Read more.
Iron based shape memory alloys (Fe-SMA) have recently been used as active flexural strengthening material for reinforced concrete (RC) beams. Fe-SMAs are characterized by a shape memory effect (SME) which allows the recovery of previously induced plastic deformations through heating. If these deformations are restrained a recovery stress is generated by the SME. This recovery stress can be used to prestress a SMA applied as a strengthening material. This paper investigates the performance and the load deformation behavior of RC beams strengthened with mechanical end anchored unbonded Fe-SMA strips activated by sequentially infrared heating. The performance of a single loop loaded and a double loop loaded SMA strengthened RC beam are compared to an un-strengthened beam and a reference beam strengthened with commercially available structural steel. In these tests the SMA strengthened beam had the highest cracking load and the highest ultimate load. It is shown that the serviceability behavior of a concrete beam can be improved by a second thermal activation. The sequential heating procedure causes different temperature and stress states during activation along the SMA strip that have not been researched previously. The possible effect of this different temperature and stress states on metal lattice phase transformation is modeled and discussed. Moreover the role of the martensitic transformation during the cooling process on leveling the inhomogeneity of phase state in the overheated section is pointed out. Full article
(This article belongs to the Special Issue Shape Memory Alloys (SMAs) for Engineering Applications)
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Graphical abstract

Open AccessArticle The Analysis of Superelasticity and Microstructural Evolution in NiTi Single Crystals by Molecular Dynamics
Materials 2019, 12(1), 57; https://doi.org/10.3390/ma12010057
Received: 26 November 2018 / Revised: 17 December 2018 / Accepted: 19 December 2018 / Published: 24 December 2018
PDF Full-text (41518 KB) | HTML Full-text | XML Full-text
Abstract
Superelasticity in shape memory alloys is an important feature for actuators and medical devices. However, the function of the devices is typically limited by mechanical bandwidth and fatigue, which are dominated by the microstructures. Thus, in order to correlate the mechanical response and [...] Read more.
Superelasticity in shape memory alloys is an important feature for actuators and medical devices. However, the function of the devices is typically limited by mechanical bandwidth and fatigue, which are dominated by the microstructures. Thus, in order to correlate the mechanical response and the microstructures, the microstructural evolution in NiTi single crystals under the compression, tensile, and shearing tests is simulated by molecular dynamics (MD) in the current study. Then, the martensite variant identification method, which identifies the crystal variants/phases of each lattice based on the transformation matrix, is used to post-process the MD results. The results with the detailed information of variants and phases reveal many features that have good agreement with those reported in the literature, such as X-interfaces and the transitional orthorhombic phase between the austenite and monoclinic phases. A new twin structure consisting of diamond and wedge-shaped patterns is also discovered. The macroscopic behavior, such as stress-strain curves and the total energy profile, is linked with the distribution of dislocation and twin patterns. The results suggest that the loading cases of shear and compression allow a low critical strain for the onset of martensitic transformation and a better superelasticity behavior. Therefore, the two loading cases are suitable to apply to the NiTi actuators. The current work is expected to provide insight into the mechanical responses and design guideline for NiTi shape memory alloy actuators. Full article
(This article belongs to the Special Issue Shape Memory Alloys (SMAs) for Engineering Applications)
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