Influence of post-processing methods on bond-slip behavior of nonlinear Fe-SMA lap-shear joints

verfasst von: Lingzhen Li, Enzo Martinelli, Wandong Wang, Eleni Chatzi, Elyas Ghafoori
Abstract: Prestressed bonded strengthening for structures employing iron-based shape memory alloy (Fe-SMA) has been proven promising. Analyzing adhesively bonded joints necessitates a thorough understanding of the bond-slip behavior. However, when examining the bond-slip behavior of Fe-SMA-to-steel joints comprising nonlinear adhesives, the “forward” and “backward” post-processing methods, representing the current state-of-the-art, produce a trilinear and a trapezoidal bond-slip pattern, respectively, which is inconsistent. To address this inconsistency, the current study investigates the bond behavior of Fe-SMA-to-steel joints, with a particular focus on the bond-slip behavior. Two finite element (FE) joints, one featuring a linear adhesive and the other comprising a nonlinear adhesive, are modeled and compared against physical tests from literature. The “forward” and “backward” processing methods are used to analyze the bond behavior of the two FE joints. Eventually, the aforementioned inconsistency is resolved; a triangular and a trapezoidal bond-slip pattern are characterized for Fe-SMA-to-steel lap-shear joints with linear and nonlinear adhesives, respectively. The trilinear bond-slip behavior is concluded as a result of error accumulation and propagation during the “forward” processing. A hybrid post-processing method, which takes the advantages of both the “forward” and “backward” processing methods, is further proposed for inferring the full-range behavior; the resulting experimental behaviors closely align with simulations using a trapezoidal bond-slip model as input. A comparison against carbon fiber reinforced polymer (CFRP) lap-shear joints demonstrates similar bond-slip characteristics between Fe-SMA and CFRP lap-shear joints.
Organisationseinheit(en): Institut für Stahlbau
Externe Organisation(en): Eidgenössische Materialprüfungs- und Forschungsanstalt (EMPA)
ETH Zürich
Hong Kong Polytechnic University
Universita di Salerno
Northwestern Polytechnical University
Typ: Artikel
Journal: Case Studies in Construction Materials
Band: 21
Anzahl der Seiten: 18
ISSN: 2214-5095
Publikationsdatum: 12.2024
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Werkstoffwissenschaften (sonstige)
Elektronische Version(en): https://doi.org/10.1016/j.cscm.2024.e03485 (Zugang: Offen)

BibTeX

@article{97ca724555dc4211a8d6bc32a48c6116,
title = "Influence of post-processing methods on bond-slip behavior of nonlinear Fe-SMA lap-shear joints",
abstract = "Prestressed bonded strengthening for structures employing iron-based shape memory alloy (Fe-SMA) has been proven promising. Analyzing adhesively bonded joints necessitates a thorough understanding of the bond-slip behavior. However, when examining the bond-slip behavior of Fe-SMA-to-steel joints comprising nonlinear adhesives, the “forward” and “backward” post-processing methods, representing the current state-of-the-art, produce a trilinear and a trapezoidal bond-slip pattern, respectively, which is inconsistent. To address this inconsistency, the current study investigates the bond behavior of Fe-SMA-to-steel joints, with a particular focus on the bond-slip behavior. Two finite element (FE) joints, one featuring a linear adhesive and the other comprising a nonlinear adhesive, are modeled and compared against physical tests from literature. The “forward” and “backward” processing methods are used to analyze the bond behavior of the two FE joints. Eventually, the aforementioned inconsistency is resolved; a triangular and a trapezoidal bond-slip pattern are characterized for Fe-SMA-to-steel lap-shear joints with linear and nonlinear adhesives, respectively. The trilinear bond-slip behavior is concluded as a result of error accumulation and propagation during the “forward” processing. A hybrid post-processing method, which takes the advantages of both the “forward” and “backward” processing methods, is further proposed for inferring the full-range behavior; the resulting experimental behaviors closely align with simulations using a trapezoidal bond-slip model as input. A comparison against carbon fiber reinforced polymer (CFRP) lap-shear joints demonstrates similar bond-slip characteristics between Fe-SMA and CFRP lap-shear joints.",
keywords = "Bond-slip behavior, Cohesive zone model (CZM), Fe-SMA (memory steel), Full-range behavior, Post-processing method",
author = "Lingzhen Li and Enzo Martinelli and Wandong Wang and Eleni Chatzi and Elyas Ghafoori",
note = "Publisher Copyright: {\textcopyright} 2024 The Authors",
year = "2024",
month = dec,
doi = "10.1016/j.cscm.2024.e03485",
language = "English",
volume = "21",
journal = "Case Studies in Construction Materials",
issn = "2214-5095",
publisher = "Elsevier B.V.",
}