Details
| Original language | English |
|---|---|
| Article number | 137690 |
| Number of pages | 15 |
| Journal | Construction and Building Materials |
| Volume | 443 |
| Early online date | 3 Aug 2024 |
| Publication status | Published - 13 Sept 2024 |
Abstract
Self-prestressing bonded patches employing iron-based shape memory alloy (Fe-SMA) and carbon fiber reinforced polymer (CFRP) for lifetime extension of cracked steel structures are investigated. The repair patches, applicable in confined spaces, are bonded over cracks, with prestress generated within Fe-SMA via activation (heating and cooling) to induce compression on cracks. Experimental tests involve cracked steel plates repaired with Fe-SMA and Fe-SMA/CFRP bonded patches, with a patch width of 50 mm and varied patch lengths of 100[sbnd]500 mm. Fe-SMA strips are activated to 180 ℃ using electric heating, generating prestresses of 154[sbnd]254 MPa. Fatigue tests (∆σ=90 MPa, R=0.2) show fatigue life extensions of ≥4.2 and ≥5.5 times for Fe-SMA and Fe-SMA/CFRP repairs. The 100 mm long Fe-SMA/CFRP patch exhibits optimal performance in lifetime extension, achieving complete crack arrest. As patch lengths decrease, failure modes shift from Fe-SMA (and CFRP) fracture to patch debonding while all patches remain effective in fatigue life extension. Finite element analysis with experimental validation quantifies the effects of prestress and load-sharing on reducing stress intensity factors at crack tips, thus retarding crack propagation. Design recommendations are proposed for the application of self-prestressing patches.
Keywords
- Adhesive bonding, Carbon fiber reinforced polymer (CFRP), Fatigue, Iron-based shape memory alloy (Fe-SMA), Memory-steel, Metallic structure, Repair
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Materials Science(all)
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In: Construction and Building Materials, Vol. 443, 137690, 13.09.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Self-prestressing bonded patches using Fe-SMA and CFRP for lifetime extension of fatigue-cracked steel details
AU - Wang, Sizhe
AU - Su, Qingtian
AU - Jiang, Xu
AU - Li, Lingzhen
AU - Motavalli, Masoud
AU - Ghafoori, Elyas
N1 - Publisher Copyright: © 2024 The Authors
PY - 2024/9/13
Y1 - 2024/9/13
N2 - Self-prestressing bonded patches employing iron-based shape memory alloy (Fe-SMA) and carbon fiber reinforced polymer (CFRP) for lifetime extension of cracked steel structures are investigated. The repair patches, applicable in confined spaces, are bonded over cracks, with prestress generated within Fe-SMA via activation (heating and cooling) to induce compression on cracks. Experimental tests involve cracked steel plates repaired with Fe-SMA and Fe-SMA/CFRP bonded patches, with a patch width of 50 mm and varied patch lengths of 100[sbnd]500 mm. Fe-SMA strips are activated to 180 ℃ using electric heating, generating prestresses of 154[sbnd]254 MPa. Fatigue tests (∆σ=90 MPa, R=0.2) show fatigue life extensions of ≥4.2 and ≥5.5 times for Fe-SMA and Fe-SMA/CFRP repairs. The 100 mm long Fe-SMA/CFRP patch exhibits optimal performance in lifetime extension, achieving complete crack arrest. As patch lengths decrease, failure modes shift from Fe-SMA (and CFRP) fracture to patch debonding while all patches remain effective in fatigue life extension. Finite element analysis with experimental validation quantifies the effects of prestress and load-sharing on reducing stress intensity factors at crack tips, thus retarding crack propagation. Design recommendations are proposed for the application of self-prestressing patches.
AB - Self-prestressing bonded patches employing iron-based shape memory alloy (Fe-SMA) and carbon fiber reinforced polymer (CFRP) for lifetime extension of cracked steel structures are investigated. The repair patches, applicable in confined spaces, are bonded over cracks, with prestress generated within Fe-SMA via activation (heating and cooling) to induce compression on cracks. Experimental tests involve cracked steel plates repaired with Fe-SMA and Fe-SMA/CFRP bonded patches, with a patch width of 50 mm and varied patch lengths of 100[sbnd]500 mm. Fe-SMA strips are activated to 180 ℃ using electric heating, generating prestresses of 154[sbnd]254 MPa. Fatigue tests (∆σ=90 MPa, R=0.2) show fatigue life extensions of ≥4.2 and ≥5.5 times for Fe-SMA and Fe-SMA/CFRP repairs. The 100 mm long Fe-SMA/CFRP patch exhibits optimal performance in lifetime extension, achieving complete crack arrest. As patch lengths decrease, failure modes shift from Fe-SMA (and CFRP) fracture to patch debonding while all patches remain effective in fatigue life extension. Finite element analysis with experimental validation quantifies the effects of prestress and load-sharing on reducing stress intensity factors at crack tips, thus retarding crack propagation. Design recommendations are proposed for the application of self-prestressing patches.
KW - Adhesive bonding
KW - Carbon fiber reinforced polymer (CFRP)
KW - Fatigue
KW - Iron-based shape memory alloy (Fe-SMA)
KW - Memory-steel
KW - Metallic structure
KW - Repair
UR - http://www.scopus.com/inward/record.url?scp=85200218166&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2024.137690
DO - 10.1016/j.conbuildmat.2024.137690
M3 - Article
AN - SCOPUS:85200218166
VL - 443
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
M1 - 137690
ER -