The Experts below are selected from a list of 13986 Experts worldwide ranked by ideXlab platform
Leroy Gardner - One of the best experts on this subject based on the ideXlab platform.
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experimental study of square and rectangular cfdst sections with stainless steel Outer Tubes under axial compression
Journal of Structural Engineering-asce, 2019Co-Authors: Fangying Wang, Ben Young, Leroy GardnerAbstract:AbstractA comprehensive experimental investigation into the axial compressive response of concrete-filled double skin tubular (CFDST) sections with stainless steel square and rectangular Outer Tube...
Yang Zhao - One of the best experts on this subject based on the ideXlab platform.
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Thermal-gradient-induced interaction energy ramp and actuation of relative axial motion in short-sleeved double-walled carbon nanoTubes.
Nanotechnology, 2011Co-Authors: Prathamesh M. Shenai, Yang ZhaoAbstract:We investigate the phenomenon of actuation of relative linear motion in double-walled carbon nanoTubes (DWNTs) resulting from a temperature gradient. Molecular dynamics simulations of DWNTs with short Outer Tube reveal that the Outer Tube is driven towards the cold end of the long inner Tube. It is also found that the terminal velocity of the sleeve roughly depends linearly on the applied thermal gradient. We calculate the inter-Tube interaction energy surface which is revealed to have a gradient depending upon the applied thermal gradient. Consequently, it is proposed that the origin of the thermophoretic motion of the Outer Tube may be attributed partially to the existence of such an energy gradient. A simple analytical model is presented accounting for the gradient in energy profile as well as the effect of biased thermal noise. It is shown that the proposed model predicts the dynamical behaviour of the long-time performance reasonably well.
Ho Jung Hwang - One of the best experts on this subject based on the ideXlab platform.
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InterTube spacing effect of cantilevered double-walled carbon nanoTube resonators with short Outer Tubes
Modelling and Simulation in Materials Science and Engineering, 2010Co-Authors: Jeong Won Kang, Oh Kuen Kwon, Ki-sub Kim, Jun Ha Lee, Eu-seok Kang, Ho Jung HwangAbstract:The vibrational properties of various double-walled carbon nanoTube resonators were investigated via a classical molecular dynamics approach. The fundamental frequencies of double-walled carbon nanoTube resonators with short Outer Tubes were closely related to the interTube spacing and the chirality of the Outer Tubes. Even though the length of the Outer Tube was 1 nm, the vibration of the Outer Tube affected that of the inner Tube. For nanoTubes with similar interTube spacing, both maximum frequencies were similar. For their corresponding maximum frequencies, the lengths of the Outer Tubes of the zigzag nanoTubes were slightly less than those of the armchair ones.
Hang Yin - One of the best experts on this subject based on the ideXlab platform.
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Dynamic behavior of curved double-wall carbon nanoTubes with rotating inner Tube
RSC Advances, 2015Co-Authors: Kun Cai, Haifang Cai, Hang Yin, Qing-hua QinAbstract:It is noted that an oscillator from a curved double-walled nanoTube can provide a local stronger periodic adjustable magnetic field than that from a straight double-walled carbon nanoTube when the inner Tube loses electric neutrality at the ends. Therefore, it is interesting to study the damped rotational and oscillatory behavior of curved double-wall carbon nanoTubes (DWCNTs) through a molecular dynamics (MD) simulation approach. As the Outer Tube is curved, intuitionally, the interTube friction becomes stronger. Hence, the rotational and oscillatory characteristics of a single-wall carbon nanoTube (SWCNT) within a curved Outer Tube might be obviously different from those of SWCNTs within straight DWCNTs. To investigate the effects of curvature on dynamic behavior, a straight (9, 9)/(14, 14) DWCNT is geometrically mapped into three curved biTube systems with different curvatures. In the microcanonical NVE ensemble, the inner Tube with initial high speed rotation has damped rotation and oscillation along the curved axis of the Outer Tube. Energy transfer between two curved Tubes is faster than that between two straight Tubes. Further, the oscillation of the inner Tube is disordered when the curvature is relatively high. The rotational frequency of an inner Tube in a curved Outer Tube decreases more quickly than that in a straight Outer Tube. Effects of temperature on dynamic behavior of curved double-walled nanoTubes are also investigated through a numerical example.
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gradientless temperature driven rotating motor from a double walled carbon nanoTube
Nanotechnology, 2014Co-Authors: Kun Cai, Qing-hua Qin, Hang YinAbstract:Rotation of the inner Tube in a double-walled carbon nanoTube (DWCNT) system with a fixed Outer Tube is investigated and found to be inducible by a relatively high uniform temperature (say, 300 K). We also found the mechanism of a gradientless temperature-driven rotating motor lies in the inner Tube losing its geometric symmetry in a high-temperature field. This mechanism can be taken as a guide for designing a motor from such a bi-Tube system. Using a computational molecular dynamics (CMD) approach and the adaptive intermolecular reactive empirical bond order (AIREBO) potential, the dynamic behavior of a bi-Tube system subjected to uniformly distributed temperature is studied. In particular, the effects of environmental temperature, boundary conditions of the Outer Tube, and interTube gap on the dynamic behavior of the bi-Tube system are investigated. Numerical examples show that a bi-Tube system with the inner Tube having 0.335 nm of interlayer gap produces the highest rotational speed.
Le Huang - One of the best experts on this subject based on the ideXlab platform.
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Circular hybrid double-skin tubular columns with a stiffener-reinforced steel inner Tube and a large-rupture-strain FRP Outer Tube: Compressive behavior
'Sociological Research Online', 2020Co-Authors: Le Huang, Zhang S, Yu Tao, Peng KAbstract:© 2020 Elsevier Ltd A typical fiber-reinforced polymer (FRP)-concrete-steel double-skin tubular column (DSTC) consists of an FRP Outer Tube, a hollow steel inner Tube and an annular concrete in-fill in between. The existing studies on DSTCs in the past decade have generally confirmed the good structural performance of such column form, while it is worth noting that the possible in-ward buckling of the steel Tubes in DSTCs is still a problem to be addressed, especially when DSTCs are subjected to large axial deformation. Against this background, a variation form of DSTCs called R-DSTCs has been recently developed by the authors. An R-DSTC is a DSTC in which the steel inner Tube is reinforced by vertical stiffeners on the Outer surface and the FRP Outer Tube can be circular, square or rectangular. The present paper presents the first ever experimental study on the compressive behavior of circular R-DSTCs which is the most common form of DSTCs. For the circular R-DSTC specimens tested in the present study, the Outer Tubes are made of a type of large-rupture-strain FRP. The vertical stiffeners on the steel inner Tube are expected to delay or restrain the inward buckling of the steel Tube, and the large-rupture-strain FRP Outer Tube makes possible a relatively large axial deformation of the specimen. In total, two DSTC specimens, twelve R-DSTC specimens and three bare steel Tubes with/without stiffeners were tested, with the studied parameters covering the quantity, the dimensions and the shape of the stiffeners and the thickness of the FRP Outer Tube. The test results showed that R-DSTC specimens had a much better performance than the corresponding DSTC specimens in terms of both axial loading capacity and ductility, due to the existence of vertical stiffeners on the steel inner Tube of R-DSTCs. The effects of the vertical stiffener-related parameters on the compressive behavior of R-DSTC specimens were also carefully examined and discussed in details
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Circular hybrid double-skin tubular columns with a stiffener-reinforced steel inner Tube and a large-rupture-strain FRP Outer Tube: Compressive behavior
Thin-Walled Structures, 2020Co-Authors: Le Huang, Shi Shun Zhang, K.d. PengAbstract:Abstract A typical fiber-reinforced polymer (FRP)-concrete-steel double-skin tubular column (DSTC) consists of an FRP Outer Tube, a hollow steel inner Tube and an annular concrete in-fill in between. The existing studies on DSTCs in the past decade have generally confirmed the good structural performance of such column form, while it is worth noting that the possible in-ward buckling of the steel Tubes in DSTCs is still a problem to be addressed, especially when DSTCs are subjected to large axial deformation. Against this background, a variation form of DSTCs called R-DSTCs has been recently developed by the authors. An R-DSTC is a DSTC in which the steel inner Tube is reinforced by vertical stiffeners on the Outer surface and the FRP Outer Tube can be circular, square or rectangular. The present paper presents the first ever experimental study on the compressive behavior of circular R-DSTCs which is the most common form of DSTCs. For the circular R-DSTC specimens tested in the present study, the Outer Tubes are made of a type of large-rupture-strain FRP. The vertical stiffeners on the steel inner Tube are expected to delay or restrain the inward buckling of the steel Tube, and the large-rupture-strain FRP Outer Tube makes possible a relatively large axial deformation of the specimen. In total, two DSTC specimens, twelve R-DSTC specimens and three bare steel Tubes with/without stiffeners were tested, with the studied parameters covering the quantity, the dimensions and the shape of the stiffeners and the thickness of the FRP Outer Tube. The test results showed that R-DSTC specimens had a much better performance than the corresponding DSTC specimens in terms of both axial loading capacity and ductility, due to the existence of vertical stiffeners on the steel inner Tube of R-DSTCs. The effects of the vertical stiffener-related parameters on the compressive behavior of R-DSTC specimens were also carefully examined and discussed in details.
