TY - JOUR
T1 - Theoretical study on the bond performance of CFRP-to-steel single-lap shear tests with multiple debonding defects
AU - Biscaia, Hugo C.
AU - Coelho, Pedro
AU - Conde, Fábio
AU - D'Antino, Tommaso
N1 - Funding Information:
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00667%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00667%2F2020/PT#
info:eu-repo/grantAgreement/FCT/Concurso de Projetos de Investigação de Caráter Exploratório (PeX) em Todos os Domínios Científicos/EXPL%2FEME-APL%2F0994%2F2021/PT#
© 2024 The Author(s). Published by Elsevier Ltd.
PY - 2024/10/1
Y1 - 2024/10/1
N2 - The amount of research on the external bonding of Carbon Fiber Reinforced Polymers (CFRP) to degraded structures has increased recently. The adhesive is the weakest element of the joint and the bonding of the adherends is critical for the efficiency of the joint. Therefore, the influence of multiple debonding defects on CFRP-to-steel joints has still not been correctly quantified nor fully understood. For this reason, the current work proposes a new numerical strategy that allows for studying the influence of multiple debonding defects when a brittle and ductile adhesive is used. A new nonlinear bond-slip relationship is used and four different ratios between the debonded and the bonded area (η) are assumed: 0%, 25%, 50%, and 75%. The proposed model is based on the Finite Difference Method (FDM) and validation is carried out with a commercial Finite Element Method (FEM) package. The load-slip curves allowed for observing that the proposed FDM and the FEM are consistent and both revealed degradation of the load capacity of the joints with the increase of η. Moreover, by adopting a displacement control at the CFRP-free end, a snap-through and snap-back phenomenon are observed in the specimens with a localized debonding defect.
AB - The amount of research on the external bonding of Carbon Fiber Reinforced Polymers (CFRP) to degraded structures has increased recently. The adhesive is the weakest element of the joint and the bonding of the adherends is critical for the efficiency of the joint. Therefore, the influence of multiple debonding defects on CFRP-to-steel joints has still not been correctly quantified nor fully understood. For this reason, the current work proposes a new numerical strategy that allows for studying the influence of multiple debonding defects when a brittle and ductile adhesive is used. A new nonlinear bond-slip relationship is used and four different ratios between the debonded and the bonded area (η) are assumed: 0%, 25%, 50%, and 75%. The proposed model is based on the Finite Difference Method (FDM) and validation is carried out with a commercial Finite Element Method (FEM) package. The load-slip curves allowed for observing that the proposed FDM and the FEM are consistent and both revealed degradation of the load capacity of the joints with the increase of η. Moreover, by adopting a displacement control at the CFRP-free end, a snap-through and snap-back phenomenon are observed in the specimens with a localized debonding defect.
KW - Bond-slip
KW - CFRP-to-steel joints
KW - Debonding defects
KW - Numerical simulation
KW - Single-lap shear test
UR - http://www.scopus.com/inward/record.url?scp=85199381045&partnerID=8YFLogxK
U2 - 10.1016/j.compstruct.2024.118406
DO - 10.1016/j.compstruct.2024.118406
M3 - Article
AN - SCOPUS:85199381045
SN - 0263-8223
VL - 345
JO - Composite Structures
JF - Composite Structures
M1 - 118406
ER -