The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Soon Hyung Hong - One of the best experts on this subject based on the ideXlab platform.
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surface modification effects of sic tile on the wettability and Interfacial Bond strength of sic tile al7075 sicp hybrid composites
Surface & Coatings Technology, 2016Co-Authors: Jongbok Park, Jun Ho Lee, Seungchan Cho, Sang Kwan Lee, Sang Bok Lee, Ho Jin Ryu, Soon Hyung HongAbstract:Abstract This study investigates the effects of a surface modification of a SiC tile on the wetting behavior and Interfacial Bond strength of SiC tile/Al7075-SiC p hybrid composites fabricated by a liquid-press process. SiO 2 , Ni, and Si layers were fabricated on each SiC tile, and the microstructures at the interface between the surface-modified SiC tile and the Al7075 were analyzed. In addition, the Interfacial Bond strength and wettability between the SiC tile and Al7075 were measured by the push-out method and the sessile drop method, respectively. The Interfacial Bond strength and wettability tests demonstrate that the surface modification of a SiC tile with Al7075 can effectively improve the tendency to attain wetting between the SiC tile and Al7075, due to the suppression of the formation of brittle Al 4 C 3 at the interface between the SiC tile and Al7075.
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microstructure and Bonding mechanism of al ti Bonded joint using al 10si 1mg filler metal
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2003Co-Authors: Woong H. Sohn, Ha H. Bong, Soon Hyung HongAbstract:Abstract The microstructures and liquid state diffusion Bonding mechanism of cp-Ti to 1050 Al using an Al–10.0wt.%Si–1.0wt.%Mg filler metal with 100 μm in thickness have been investigated at 620 °C under 1×10−4 Torr. The effects of Bonding process parameters on microstructure of Bonded joint have been analyzed by using an optical microscope, AES, scanning electron microscopy and EDS. The Interfacial Bond strength of Al/Ti Bonded joints was measured by the single lap shear test. The results show that the Bonding at the interface between Al and filler metal proceeds by wetting the Al with molten filler metal, and followed by removal of oxide layer on surface of Al. The interface between Al and filler metal moved during the isothermal solidification of filler metal by the diffusion of Si from filler metal into Al layer. The interface between Al and filler metal became curved in shape with increasing Bonding time due to capillary force at grain boundaries. The Bonding at the interface between Ti and filler metal proceeds by the formation of two different intermetallic compound layers, identified as Al5Si12Ti7 and Al12Si3Ti5, followed by the growth of the intermetallic compound layers. The Interfacial Bond strength at Al/Ti joint increased with increasing Bonding time up to 25 min at 620 °C. However, the Interfacial Bond strength of Al/Ti joint decreased after Bonding time of 25 min at 620 °C due to formation of cavities in Al near Al/intermetallic interfaces.
Daniel V Oliveira - One of the best experts on this subject based on the ideXlab platform.
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moisture induced degradation of Interfacial Bond in frp strengthened masonry
Composites Part B-engineering, 2016Co-Authors: Hamid Maljaee, Bahman Ghiassi, Paulo B Lourenco, Daniel V OliveiraAbstract:Abstract Externally Bonded strengthening of masonry structures using Fiber Reinforced Polymers (FRPs) has been accepted as a promising technique. Although the effectiveness of FRPs in improving the performance of masonry components has been extensively investigated, their long-term performance and durability remain poorly addressed. This paper, tackling one of the aspects related to durability of these systems, presents an experimental investigation on the effect of long-term (one year) water immersion on the performance of GFRP-strengthened bricks. The tests include materials' mechanical tests, as well as pull-off and single-lap shear Bond tests, to investigate the changes in material properties and Bond behavior with immersion time, respectively. The effect of mechanical surface treatment on the durability of the strengthened system as well as the reversibility of the degradation upon partial drying are also investigated. The experimental results are presented and critically discussed.
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Bond behavior of srg strengthened masonry units testing and numerical modeling
Construction and Building Materials, 2014Co-Authors: Arezoo Razavizadeh, Bahman Ghiassi, Daniel V OliveiraAbstract:Abstract Innovative materials such as steel reinforced grout (SRG) have shown superior behavior in terms of sustainability and compatibility comparing to their FRP counterparts for external strengthening of masonry structures. Considering the critical Bond mechanisms at interfaces, this paper addresses an experimental and numerical investigation on Bond in SRG-strengthened masonry by performing conventional single-lap shear Bond tests revealing the importance of substrate preparation for application of SRG followed by a numerical model proposing suitable Interfacial Bond-slip laws. The numerical model, once validated against experimental results, is used to investigate further aspects of the Bond behavior and the results are discussed.
Jongbok Park - One of the best experts on this subject based on the ideXlab platform.
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surface modification effects of sic tile on the wettability and Interfacial Bond strength of sic tile al7075 sicp hybrid composites
Surface & Coatings Technology, 2016Co-Authors: Jongbok Park, Jun Ho Lee, Seungchan Cho, Sang Kwan Lee, Sang Bok Lee, Ho Jin Ryu, Soon Hyung HongAbstract:Abstract This study investigates the effects of a surface modification of a SiC tile on the wetting behavior and Interfacial Bond strength of SiC tile/Al7075-SiC p hybrid composites fabricated by a liquid-press process. SiO 2 , Ni, and Si layers were fabricated on each SiC tile, and the microstructures at the interface between the surface-modified SiC tile and the Al7075 were analyzed. In addition, the Interfacial Bond strength and wettability between the SiC tile and Al7075 were measured by the push-out method and the sessile drop method, respectively. The Interfacial Bond strength and wettability tests demonstrate that the surface modification of a SiC tile with Al7075 can effectively improve the tendency to attain wetting between the SiC tile and Al7075, due to the suppression of the formation of brittle Al 4 C 3 at the interface between the SiC tile and Al7075.
Young Soo Yoon - One of the best experts on this subject based on the ideXlab platform.
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material and Bond properties of ultra high performance fiber reinforced concrete with micro steel fibers
Composites Part B-engineering, 2014Co-Authors: Hyun-oh Shin, Jun-mo Yang, Young Soo YoonAbstract:Abstract For investigating the effect of fiber content on the material and Interfacial Bond properties of ultra high performance fiber reinforced concrete (UHPFRC), four different volume ratios of micro steel fibers (Vf = 1%, 2%, 3%, and 4%) were used within an identical mortar matrix. Test results showed that 3% steel fiber by volume yielded the best performance in terms of compressive strength, elastic modulus, shrinkage behavior, and Interfacial Bond strength. These parameters improved as the fiber content was increased up to 3 vol.%. Flexural behaviors such as flexural strength, deflection, and crack mouth opening displacement at peak load had pseudo-linear relationships with the fiber content. Through inverse analysis, it was shown that fracture parameters including cohesive stress and fracture energy are significantly influenced by the fiber content: higher cohesive stress and fracture energy were achieved with higher fiber content. The analytical models for the ascending branch of Bond stress-slip response suggested in the literature were considered for UHPFRC, and appropriate parameters were derived from the present test data.
Shamim A Sheikh - One of the best experts on this subject based on the ideXlab platform.
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experimental study on the Interfacial Bond behavior of frp plate high strength concrete under seawater immersion
Construction and Building Materials, 2020Co-Authors: Pu Zhang, Yuyang Pang, Danying Gao, Shamim A Sheikh, Shuangquan ZhangAbstract:Abstract The excellent Bonding performance of the glass fiber-reinforced polymer (GFRP) profile-high-strength concrete interface is the key to ensuring the safety, reliability and durability of a composite structure. Therefore, it is necessary to study the durability of the composite interface. In this paper, a total of 48 GFRP plate-high-strength concrete double-lap joints were tested to investigate the effect of the epoxy resin type, Interfacial type and artificial seawater immersion time on the Bonded interfaces. The main properties of the Bonded joints were examined, including the failure mode, ultimate load, load-slip curve, typical strain and shear stress distributions along GFRP plates. The results showed that the ultimate loads of each type of interface gradually decreased with increasing immersion time. After 360 days of artificial seawater immersion at a constant temperature, the ultimate load of the wet Bond (WB) interface had the largest reduction, and the ultimate load of the dry Bond (DB) interface showed a minimal decrease. The ultimate load of the shear key combined with wet Bond (SK-WB) interface was significantly greater than that of the other three interfaces under different immersion ages. In general, the durability of the interface with the CFSR type (B-type) epoxy resin was superior to that of the Sanyu L-500 type (A-type) epoxy resin. The strain and Interfacial shear stress distributions along GFRP plates of the DB interface specimens were different from that of the SK-WB interface specimens under different immersion ages.
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influence factors analysis of the Interfacial Bond behavior between gfrp plates concrete
Structures, 2020Co-Authors: Pu Zhang, Yuyang Pang, Hu Feng, Danying Gao, Jun Zhao, Shamim A SheikhAbstract:Abstract The Interfacial Bond properties between fiber-reinforced polymer (FRP) plates and concrete are critical for FRP plate-concrete composite structures. Numerous researchers have attempted to improve the Interfacial Bond performance by using innovative techniques. In this study, a new type of interface with a grooved glass fiber-reinforced polymer (GFRP) shear key was developed to analyze the influence factors of the Bond behavior between GFRP plates and concrete. For this purpose, four types of GFRP-concrete double-lap shear specimens were manufactured to study the failure modes, ultimate load, Interfacial stiffness and load-slip curves under static load. The variables considered were mainly the different FRP plate transverse surface mats, shear key positions, epoxy resin types and concrete strengths. The results showed that the shear key combined with wet-Bond (SK-WB) interface exhibits the best Bond behavior. The surface roughness and surface mat type of the FRP plate has a great influence on the ultimate load of the GFRP plate-concrete composite interface. A shear key position of 80 mm from the loaded end is recommended for the double-lap shear specimens. Concrete strength has a significant effect on the Bond behavior of the dry-Bond (DB) interface, the wet-Bond (WB) interface and the shear key combined with wet-Bond (SK-WB) interface.