The Experts below are selected from a list of 8208 Experts worldwide ranked by ideXlab platform
Kyu Cho - One of the best experts on this subject based on the ideXlab platform.
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syntactic Foam Core metal matrix sandwich composite compressive properties and strain rate effects
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2015Co-Authors: Mohammed Yaseer Omar, Chongchen Xiang, Nikhil Gupta, Oliver M Strbik, Kyu ChoAbstract:Abstract The present work is the first attempt to study metal matrix syntactic Foam Core sandwich composites. The sandwich is studied for microstructure and compressive properties at quasi-static and high strain rates. Under quasi-static compressive conditions, specimens were tested in the flatwise and edgewise orientations. The compressive strength, yield strength and plateau stress were higher in the flatwise orientation. Furthermore, both orientations for the sandwich composites showed a higher specific compressive strength and specific yield strength than the Foam Core alone. Failure initiated in the particles in the flatwise orientation, but in the carbon fabrics in the edgewise orientation. The results show that the fabric had a reinforcing effect under quasi-static conditions. The high strain rate (HSR) characterization was conducted in the strain rate range 525–845 s −1 using a split-Hopkinson pressure bar set-up equipped with a high speed image acquisition system. Within this strain rate range, the compressive strength of the sandwich is similar to that of the syntactic Foam Core alone. Upon review, the syntactic Foam Core metal matrix sandwich outperforms most of the syntactic Foams in terms of energy absorption and compressive strength at comparable density levels.
Mostapha Tarfaoui - One of the best experts on this subject based on the ideXlab platform.
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determination of mode i ii strain energy release rates in composite Foam Core sandwiches an experimental study of the composite Foam Core interfacial fracture resistance
Composites Part B-engineering, 2017Co-Authors: Owaisur Rahman Shah, Mostapha TarfaouiAbstract:Abstract The use of composite materials is on the rise in different engineering fields. Following this trend the wind turbine industry has adopted composites as their primary material of choice. For wind turbine blades having large unsupported functional aerodynamic surfaces; the structural stiffness is very important. Stiffness is required to keep the deformations to a minimum under aerodynamic forces. The blade is thus stiffened using sandwich structures at high strain locations within the structure. The lightweight Foam Cored sandwiches though add stiffness, at the same time pose a challenge for design as the difference in stiffness of both the face-plate and the Foam Core is very high. The resistance to fracture in any part of the structure is an important design parameter to be determined. The determination of fracture resistance quantified here as the Strain Energy Release Rate (SERR) poses some unique challenges when dealing with highly heterogeneous materials in terms of stiffness. In this study some approaches have been analyzed while others are developed to tackle this problem and to measure the Mode I & II SERR of the face-plate Foam-Core interface. The sandwich Core varies in both thickness and density depending on the loading and thus the location along the blade length. However for this study we have used a single density of Foam Core for the most part of the turbine blade. Different thicknesses of the Foam Cores are used to determine the effect of scale on the calculated SERR.
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Determination of mode I & II strain energy release rates in composite Foam Core sandwiches. An experimental study of the composite Foam Core interfacial fracture resistance
Composites Part B-engineering, 2017Co-Authors: Owaisur Rahman Shah, Mostapha TarfaouiAbstract:Abstract The use of composite materials is on the rise in different engineering fields. Following this trend the wind turbine industry has adopted composites as their primary material of choice. For wind turbine blades having large unsupported functional aerodynamic surfaces; the structural stiffness is very important. Stiffness is required to keep the deformations to a minimum under aerodynamic forces. The blade is thus stiffened using sandwich structures at high strain locations within the structure. The lightweight Foam Cored sandwiches though add stiffness, at the same time pose a challenge for design as the difference in stiffness of both the face-plate and the Foam Core is very high. The resistance to fracture in any part of the structure is an important design parameter to be determined. The determination of fracture resistance quantified here as the Strain Energy Release Rate (SERR) poses some unique challenges when dealing with highly heterogeneous materials in terms of stiffness. In this study some approaches have been analyzed while others are developed to tackle this problem and to measure the Mode I & II SERR of the face-plate Foam-Core interface. The sandwich Core varies in both thickness and density depending on the loading and thus the location along the blade length. However for this study we have used a single density of Foam Core for the most part of the turbine blade. Different thicknesses of the Foam Cores are used to determine the effect of scale on the calculated SERR.
Abdolhossein Fereidoon - One of the best experts on this subject based on the ideXlab platform.
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non destructive evaluation of damage modes in nanocomposite Foam Core sandwich panel subjected to low velocity impact
Composites Part B-engineering, 2016Co-Authors: Iman Taraghi, Abdolhossein FereidoonAbstract:Abstract This research studied the effect of multi-walled carbon nanotubes (MWCNTs) on the internal and external damages of Foam-Core sandwich panels with kevlar fiber reinforced epoxy face sheets subjected to a low-velocity impact. The sandwich panels were subjected to six levels of energy. Energy profile diagrams (EPDs) were plotted to determine the rebounding, penetration and perforation thresholds of the sandwich panels. Non-destructive evaluation methods have been employed for detecting and measuring damage size of the sandwich panels using X-ray radiography and active infrared thermography. The results show that MWCNTs can improve the absorbed energy and penetration threshold of the Foam-Core sandwich panels.
Mohammed Yaseer Omar - One of the best experts on this subject based on the ideXlab platform.
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syntactic Foam Core metal matrix sandwich composite compressive properties and strain rate effects
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2015Co-Authors: Mohammed Yaseer Omar, Chongchen Xiang, Nikhil Gupta, Oliver M Strbik, Kyu ChoAbstract:Abstract The present work is the first attempt to study metal matrix syntactic Foam Core sandwich composites. The sandwich is studied for microstructure and compressive properties at quasi-static and high strain rates. Under quasi-static compressive conditions, specimens were tested in the flatwise and edgewise orientations. The compressive strength, yield strength and plateau stress were higher in the flatwise orientation. Furthermore, both orientations for the sandwich composites showed a higher specific compressive strength and specific yield strength than the Foam Core alone. Failure initiated in the particles in the flatwise orientation, but in the carbon fabrics in the edgewise orientation. The results show that the fabric had a reinforcing effect under quasi-static conditions. The high strain rate (HSR) characterization was conducted in the strain rate range 525–845 s −1 using a split-Hopkinson pressure bar set-up equipped with a high speed image acquisition system. Within this strain rate range, the compressive strength of the sandwich is similar to that of the syntactic Foam Core alone. Upon review, the syntactic Foam Core metal matrix sandwich outperforms most of the syntactic Foams in terms of energy absorption and compressive strength at comparable density levels.
Owaisur Rahman Shah - One of the best experts on this subject based on the ideXlab platform.
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determination of mode i ii strain energy release rates in composite Foam Core sandwiches an experimental study of the composite Foam Core interfacial fracture resistance
Composites Part B-engineering, 2017Co-Authors: Owaisur Rahman Shah, Mostapha TarfaouiAbstract:Abstract The use of composite materials is on the rise in different engineering fields. Following this trend the wind turbine industry has adopted composites as their primary material of choice. For wind turbine blades having large unsupported functional aerodynamic surfaces; the structural stiffness is very important. Stiffness is required to keep the deformations to a minimum under aerodynamic forces. The blade is thus stiffened using sandwich structures at high strain locations within the structure. The lightweight Foam Cored sandwiches though add stiffness, at the same time pose a challenge for design as the difference in stiffness of both the face-plate and the Foam Core is very high. The resistance to fracture in any part of the structure is an important design parameter to be determined. The determination of fracture resistance quantified here as the Strain Energy Release Rate (SERR) poses some unique challenges when dealing with highly heterogeneous materials in terms of stiffness. In this study some approaches have been analyzed while others are developed to tackle this problem and to measure the Mode I & II SERR of the face-plate Foam-Core interface. The sandwich Core varies in both thickness and density depending on the loading and thus the location along the blade length. However for this study we have used a single density of Foam Core for the most part of the turbine blade. Different thicknesses of the Foam Cores are used to determine the effect of scale on the calculated SERR.
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Determination of mode I & II strain energy release rates in composite Foam Core sandwiches. An experimental study of the composite Foam Core interfacial fracture resistance
Composites Part B-engineering, 2017Co-Authors: Owaisur Rahman Shah, Mostapha TarfaouiAbstract:Abstract The use of composite materials is on the rise in different engineering fields. Following this trend the wind turbine industry has adopted composites as their primary material of choice. For wind turbine blades having large unsupported functional aerodynamic surfaces; the structural stiffness is very important. Stiffness is required to keep the deformations to a minimum under aerodynamic forces. The blade is thus stiffened using sandwich structures at high strain locations within the structure. The lightweight Foam Cored sandwiches though add stiffness, at the same time pose a challenge for design as the difference in stiffness of both the face-plate and the Foam Core is very high. The resistance to fracture in any part of the structure is an important design parameter to be determined. The determination of fracture resistance quantified here as the Strain Energy Release Rate (SERR) poses some unique challenges when dealing with highly heterogeneous materials in terms of stiffness. In this study some approaches have been analyzed while others are developed to tackle this problem and to measure the Mode I & II SERR of the face-plate Foam-Core interface. The sandwich Core varies in both thickness and density depending on the loading and thus the location along the blade length. However for this study we have used a single density of Foam Core for the most part of the turbine blade. Different thicknesses of the Foam Cores are used to determine the effect of scale on the calculated SERR.
