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dc.contributor.authorMorano, Chiara
dc.contributor.authorTao, Ran
dc.contributor.authorAlfano, Marco
dc.contributor.authorLubineau, Gilles
dc.identifier.citationTaubert, A. (2008). Welcome to Materials – a New Open Access Journal for a Growing Scientific Community. Materials, 1(1), 1–2. doi:10.3390/ma1010001
dc.description.abstractAdhesive bonding of carbon fiber reinforced polymers (CFRPs) is a key enabling technology for the assembly of lightweight structures. A surface pre-treatment is necessary to remove contaminants related to material manufacturing and ensure bond reliability. The present experimental study focuses on the effect of mechanical abrasion on the damage mechanisms and fracture toughness of CFRP/epoxy joints. The CFRP plates employed in the current study were provided with a thin layer of surface epoxy matrix and featured enhanced sensitivity to surface preparation. Various degrees of morphological modification and fairly controllable carbon fibres exposure were obtained using sanding with emery paper and grit-blasting with glass particles. In the sanding process, different grit sizes of SiC paper were used, while the grit blasting treatment was carried by varying the sample-to-gun distance and the number of passes. Detailed surveys of surface topography and wettability were carried out using various methods, including scanning electron microscopy (SEM), contact profilometry, and wettability measurements. Mechanical tests were performed using double cantilever beam (DCB) adhesive joints. Two surface conditions were selected for the experiments: sanded interfaces mostly made of polymer matrix and grit-blasted interfaces featuring a significant degree of exposed carbon fibers. Despite the different topographies, the selected surfaces displayed similar wettability. Besides, the adhesive joints with sanded interfaces had a smooth fracture response (steady-state crack growth). In contrast, the exposed fibers at grit-blasted interfaces enabled large-scale bridging and a significant R-curve behaviour. While it is often predicated that quality composite joints require surfaces with a high percentage of the polymer matrix, our mechanical tests show that the exposure of carbon fibers can facilitate a remarkable toughening effect. These results open up additional interesting prospects for future works concerning toughening of composite joints in automotive and aerospace applications.
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award number OSR-2017-CRG6-3388.01
dc.publisherMDPI AG
dc.rightsArchived with thanks to Materials
dc.subjectadhesive bonding
dc.subjectfracture toughness
dc.titleEffect of Mechanical Pre-Treatments on Damage Mechanisms and Fracture Toughness in CFRP/Epoxy Joints
dc.contributor.departmentComposite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.institutionDepartment of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende, CS, Italy
dc.contributor.institutionDepartment of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
kaust.personTao, Ran
kaust.personLubineau, Gilles
kaust.acknowledged.supportUnitOffice of Sponsored Research (OSR)

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