PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2023) 000–000 Structural Integrity Procedia 00 (2023) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 2075–2082

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Experimental study on recovery stress behavior of memory-steel patches bonded on cracked steel plates Sizhe Wang a,b , Qingtian Su b , Xu Jiang b , Masoud Motavalli a , Elyas Ghafoori a,b,c, * a Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, 8600, Switzerland b College of Civil Engineering, Tongji University, Shanghai, 200092, China c Institute for Steel Construction, Leibniz University Hannover, Hannover, 30167, Germany Abstract The use of iron-based shape memory alloy (Fe-SMA) demonstrates effectiveness in repairing cracked steel structures for lifetime extension. This study presents an activation test of memory-steel (i.e., Fe-SMA) patches adhesively bonded on cracked steel plates to investigate the recovery stress behavior. Fe-SMA strips with different lengths ranging from 100 to 500 mm are bonded over cracks using a ductile nonlinear adhesive. The middle part of the Fe-SMA strip (over the crack) is activated using the electrical resistive heating technique. The Fe-SMA is heated to a target temperature of 180 ℃ and subsequently cools down to the room temperature. The temperatures of the anchorage parts are maintained below the adhesive glass transition temperature during the activation process. After activation, final Fe-SMA prestresses ranging from approximately 154 to 249 MPa are successfully generated and sustained across all the specimens, resulting in average compressive strains of approximately -40 to -120 µm/m in the steel plates. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Smart repair; memory-steel; iron-based shape memory alloy (Fe-SMA); adhesive bond; activation; prestress. SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Experimental study on recovery stress behavior of memory-steel patches bonded on cracked steel plates Sizhe Wang a,b , Qingtian Su b , Xu Jiang b , Masoud Motavalli a , Elyas Ghafoori a,b,c, * a Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, 8600, Switzerland b College of Civil Engineering, Tongji University, Shanghai, 200092, China c Institute for Steel Construction, Leibniz University Hannover, Hannover, 30167, Germany Abstract The use of iron-based shape memory alloy (Fe-SMA) demonstrates effectiveness in repairing cracked steel structures for lifetime extension. This study presents an activation test of memory-steel (i.e., Fe-SMA) patches adhesively bonded on cracked steel plates to investigate the recovery stress behavior. Fe-SMA strips with different lengths ranging from 100 to 500 mm are bonded over cracks using a ductile nonlinear adhesive. The middle part of the Fe-SMA strip (over the crack) is activated using the electrical resistive heating technique. The Fe-SMA is heated to a target temperature of 180 ℃ and subsequently cools down to the room temperature. The temperatures of the anchorage parts are maintained below the adhesive glass transition temperature during the activation process. After activation, final Fe-SMA prestresses ranging from approximately 154 to 249 MPa are successfully generated and sustained across all the specimens, resulting in average compressive strains of approximately -40 to -120 µm/m in the steel plates. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Smart repair; memory-steel; iron-based shape memory alloy (Fe-SMA); adhesive bond; activation; prestress. © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

* Corresponding author. Tel.: +49 511 762 2437; fax: +49 163 862 2991. E-mail address: ghafoori@stahl.uni-hannover.de * Corresponding author. Tel.: +49 511 762 2437; fax: +49 163 862 2991. E-mail address: ghafoori@stahl.uni-hannover.de

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

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