The Experts below are selected from a list of 114 Experts worldwide ranked by ideXlab platform
Bekir Sami Yilbas - One of the best experts on this subject based on the ideXlab platform.
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influence of adhesive thickness and filler content on the mechanical performance of aluminum single lap joints bonded with aluminum powder filled epoxy adhesive
Journal of Materials Processing Technology, 2008Co-Authors: Ramazan Kahraman, Mohd S.Sunar, Bekir Sami YilbasAbstract:Abstract The objective of this study was to develop information on the influence of adhesive thickness and aluminum filler content on the mechanical performance of aluminum joints bonded by aluminum powder filled epoxy. The adhesive strength of the joints was determined by utilizing the Single-Lap Shear Test. The influence of adhesive thickness and aluminum filler content on stress distribution within the adhesive was also analyzed by finite element method (FEM). Both FEM analysis and the experimental investigation show that in general adhesion strength decreases as the thickness of the adhesive increases. It is observed from the predictions (FEM simulations) that the stress level increases at the adhesive–metal substrate interface as the aluminum filler content in the adhesive increases. Experimental results show that epoxy adhesive retains its strength up to the 50 wt% aluminum filler content. The joints fail in cohesive mode (failure within the adhesive) due to the high stress levels generated in the adhesive, which indicates that the adhesion to the metal surface is stronger than that of the interior part of the adhesive.
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influence of water immersion on the single lap Shear strength of aluminum joints bonded with aluminum powder filled epoxy adhesive
Journal of Adhesion Science and Technology, 2004Co-Authors: Mamdouh A Alharthi, Mohd S.Sunar, Bekir Sami Yilbas, Ramazan Kahraman, B Abdul J AleemAbstract:Durability of adhesively-bonded aluminum joints was investigated by measuring the joint strength using the Single-Lap Shear Test before and after exposure to distilled water and seawater. Fractured specimens were examined by photography and scanning electron microscopy to determine the failure modes. Addition of Al particles as much as 50 wt% did not cause any significant decrease in adhesive joint strength. Moreover, varying the Al filler content in the adhesive did not have a significant effect on adhesive behavior in either of the two environments studied. The unexposed adhesive joints failed almost completely in a cohesive (in the adhesive) failure mode. Some decrease in strength was observed in adhesive joints after exposure to both distilled water and seawater for 6 months. The decrease in adhesive joint strength was more significant for specimens immersed in distilled water than those immersed in seawater, probably due to the higher amount of moisture in the adhesive in distilled water than in seaw...
Carlo Pellegrino - One of the best experts on this subject based on the ideXlab platform.
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An indirect method to calibrate the interfacial cohesive material law for FRCM-concrete joints
Materials & Design, 2017Co-Authors: Francesco Focacci, Christian Carloni, Lesley Sneed, Tommaso D'antino, Carlo PellegrinoAbstract:Abstract The cohesive material law (CML), i.e., relationship between the interfacial Shear stress and slip between a fiber reinforced composite and the substrate, is a fundamental tool to model the structural behavior of composite-strengthened elements. A crucial problem that researchers working in the field of strengthening applications with fiber reinforced cementitious matrix (FRCM) composites face is how to obtain the CML. A direct method to determine the CML could be applied if the longitudinal strain is measured along the bonded length. However, since the critical interface for some FRCM composites appears to be the interface between the fibers and matrix, measuring the fiber strain in FRCM composites is a difficult task due to the presence of the matrix that embeds the fiber textile. To overcome this difficulty, an indirect method is proposed in this paper. The parameters of the CML are determined by fitting experimental data in terms of peak load measured for different composite bonded lengths. The procedure is applied to Single-Lap Shear Test results previously published by the authors. The CML obtained shows good correlation with the CML obtained from direct calibration of strain profiles measured along the bonded length and is able to predict the experimental load responses.
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effect of the inherent eccentricity in single lap direct Shear Tests of pbo frcm concrete joints
Composite Structures, 2016Co-Authors: Tommaso Dantino, Christian Carloni, Lesley Sneed, Carlo PellegrinoAbstract:Abstract Investigation of the bond between fiber reinforced composites and the substrates onto which they are applied is of critical importance to understand their failure mechanisms. The bond behavior can be studied using different experimental Test set-ups; the most commonly used are the Single-Lap and double-lap direct-Shear Tests. Although Single-Lap Shear Tests are simpler to carry out than double-lap Shear Tests, the presence of an eccentricity between the pulling and restraining forces leads to a mixed mode fracture process at the interface, which may influence the results. This study investigates the eccentricity effect on the bond behavior of fiber reinforced cementitious matrix (FRCM) composite–concrete joints. FRCM composite strips with the same bonded length were applied to concrete blocks of different lengths and Tested using the Single-Lap Shear Test. The use of digital image correlation (DIC) allowed for studying the strain field on the surface of the bonded composite. Results were compared with those from double-lap Shear Tests of the same composite. The results obtained confirm that the eccentricity effect is negligible for bonded lengths longer than the effective bond length.
Ramazan Kahraman - One of the best experts on this subject based on the ideXlab platform.
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influence of adhesive thickness and filler content on the mechanical performance of aluminum single lap joints bonded with aluminum powder filled epoxy adhesive
Journal of Materials Processing Technology, 2008Co-Authors: Ramazan Kahraman, Mohd S.Sunar, Bekir Sami YilbasAbstract:Abstract The objective of this study was to develop information on the influence of adhesive thickness and aluminum filler content on the mechanical performance of aluminum joints bonded by aluminum powder filled epoxy. The adhesive strength of the joints was determined by utilizing the Single-Lap Shear Test. The influence of adhesive thickness and aluminum filler content on stress distribution within the adhesive was also analyzed by finite element method (FEM). Both FEM analysis and the experimental investigation show that in general adhesion strength decreases as the thickness of the adhesive increases. It is observed from the predictions (FEM simulations) that the stress level increases at the adhesive–metal substrate interface as the aluminum filler content in the adhesive increases. Experimental results show that epoxy adhesive retains its strength up to the 50 wt% aluminum filler content. The joints fail in cohesive mode (failure within the adhesive) due to the high stress levels generated in the adhesive, which indicates that the adhesion to the metal surface is stronger than that of the interior part of the adhesive.
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influence of water immersion on the single lap Shear strength of aluminum joints bonded with aluminum powder filled epoxy adhesive
Journal of Adhesion Science and Technology, 2004Co-Authors: Mamdouh A Alharthi, Mohd S.Sunar, Bekir Sami Yilbas, Ramazan Kahraman, B Abdul J AleemAbstract:Durability of adhesively-bonded aluminum joints was investigated by measuring the joint strength using the Single-Lap Shear Test before and after exposure to distilled water and seawater. Fractured specimens were examined by photography and scanning electron microscopy to determine the failure modes. Addition of Al particles as much as 50 wt% did not cause any significant decrease in adhesive joint strength. Moreover, varying the Al filler content in the adhesive did not have a significant effect on adhesive behavior in either of the two environments studied. The unexposed adhesive joints failed almost completely in a cohesive (in the adhesive) failure mode. Some decrease in strength was observed in adhesive joints after exposure to both distilled water and seawater for 6 months. The decrease in adhesive joint strength was more significant for specimens immersed in distilled water than those immersed in seawater, probably due to the higher amount of moisture in the adhesive in distilled water than in seaw...
Jiajun Shi - One of the best experts on this subject based on the ideXlab platform.
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assessment of interfacial fracture energy between concrete and cfrp under water immersion conditions
Construction and Building Materials, 2021Co-Authors: Jiajun ShiAbstract:Abstract The interfacial fracture energy is a critical parameter for the bond between carbon fiber reinforced polymer (CFRP) plate and concrete, and is significantly influenced by the ingress of moisture. Exploiting the Single-Lap Shear Test, this paper studies the effect of water immersion on the interfacial fracture energy experimentally and analytically by taking into account the impacts of immersion time, concrete compressive strength, and concrete surface roughness. The results indicates that: 1) water immersion transforms the failure mode from concrete cohesive failure to debonding of the adhesive layer from the concrete substrate. 2) the interfacial fracture energy considerably drops in the first six months of immersion in water and then levels off; 3) the reduction of the interfacial fracture energy depends on the compressive strength of the concrete substrates. A higher compressive strength of concrete leads to a more significant reduction; 4) the impact of water immersion on the mechanical interlocking of concrete with epoxy is negligible. Finally, based on the reduction mechanism of the breakage of the van der Waals interactions and hydrogen bonding between SiO2 groups of concrete and hydroxyl groups (–OH) of epoxy with ingress of water, an analytical model is proposed for predicting the interfacial fracture energy.
Mohd S.Sunar - One of the best experts on this subject based on the ideXlab platform.
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influence of adhesive thickness and filler content on the mechanical performance of aluminum single lap joints bonded with aluminum powder filled epoxy adhesive
Journal of Materials Processing Technology, 2008Co-Authors: Ramazan Kahraman, Mohd S.Sunar, Bekir Sami YilbasAbstract:Abstract The objective of this study was to develop information on the influence of adhesive thickness and aluminum filler content on the mechanical performance of aluminum joints bonded by aluminum powder filled epoxy. The adhesive strength of the joints was determined by utilizing the Single-Lap Shear Test. The influence of adhesive thickness and aluminum filler content on stress distribution within the adhesive was also analyzed by finite element method (FEM). Both FEM analysis and the experimental investigation show that in general adhesion strength decreases as the thickness of the adhesive increases. It is observed from the predictions (FEM simulations) that the stress level increases at the adhesive–metal substrate interface as the aluminum filler content in the adhesive increases. Experimental results show that epoxy adhesive retains its strength up to the 50 wt% aluminum filler content. The joints fail in cohesive mode (failure within the adhesive) due to the high stress levels generated in the adhesive, which indicates that the adhesion to the metal surface is stronger than that of the interior part of the adhesive.
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influence of water immersion on the single lap Shear strength of aluminum joints bonded with aluminum powder filled epoxy adhesive
Journal of Adhesion Science and Technology, 2004Co-Authors: Mamdouh A Alharthi, Mohd S.Sunar, Bekir Sami Yilbas, Ramazan Kahraman, B Abdul J AleemAbstract:Durability of adhesively-bonded aluminum joints was investigated by measuring the joint strength using the Single-Lap Shear Test before and after exposure to distilled water and seawater. Fractured specimens were examined by photography and scanning electron microscopy to determine the failure modes. Addition of Al particles as much as 50 wt% did not cause any significant decrease in adhesive joint strength. Moreover, varying the Al filler content in the adhesive did not have a significant effect on adhesive behavior in either of the two environments studied. The unexposed adhesive joints failed almost completely in a cohesive (in the adhesive) failure mode. Some decrease in strength was observed in adhesive joints after exposure to both distilled water and seawater for 6 months. The decrease in adhesive joint strength was more significant for specimens immersed in distilled water than those immersed in seawater, probably due to the higher amount of moisture in the adhesive in distilled water than in seaw...
