The Experts below are selected from a list of 2406 Experts worldwide ranked by ideXlab platform
Jinsong Leng - One of the best experts on this subject based on the ideXlab platform.
-
electro active variable stiffness Corrugated structure based on Shape memory polymer composite
2020Co-Authors: Xiaobo Gong, Fang Xie, Liwu Liu, Yanju Liu, Jinsong LengAbstract:Shape-memory polymers (SMPs) can adjust their stiffness, lock a temporary Shape, and recover the permanent Shape upon an appropriate stimulus. They are applied in the field of morphing skins. This work presents a variable-stiffness Corrugated sheet based on a carbon fiber felt (CFF)-reinforced epoxy-based SMP composite that shows variable stiffness and extreme mechanical anisotropy for potential morphing skin applications. The Corrugated sheet exhibits a variable stiffness with a change in temperature, which can help the skin adjust its stiffness according to different service environments. The Corrugated sheet can be electrically heated rapidly and homogeneously due to its high electrical conductivity and enhanced heat transfer efficiency. Its Joule-heating effect acts as an effective active stimulation of the variable stiffness and Shape-memory effect. The CFF-reinforced epoxy-based SMP composite was manufactured into a Corrugated Shape to obtain extreme mechanical anisotropy. The Corrugated sheet shows a low in-plane stiffness to minimize the actuation energy, while it also possesses high out-of-plane stiffness to transfer the aerodynamic pressure load. Its mechanical properties, electrical heating performance, and Shape-memory effect were investigated using experiments. The results show that the proposed SMP composite exhibits extreme mechanical anisotropy, considerable deformation ability, and variable stiffness induced by Joule heating without an external heater.
Xiaobo Gong - One of the best experts on this subject based on the ideXlab platform.
-
electro active variable stiffness Corrugated structure based on Shape memory polymer composite
2020Co-Authors: Xiaobo Gong, Fang Xie, Liwu Liu, Yanju Liu, Jinsong LengAbstract:Shape-memory polymers (SMPs) can adjust their stiffness, lock a temporary Shape, and recover the permanent Shape upon an appropriate stimulus. They are applied in the field of morphing skins. This work presents a variable-stiffness Corrugated sheet based on a carbon fiber felt (CFF)-reinforced epoxy-based SMP composite that shows variable stiffness and extreme mechanical anisotropy for potential morphing skin applications. The Corrugated sheet exhibits a variable stiffness with a change in temperature, which can help the skin adjust its stiffness according to different service environments. The Corrugated sheet can be electrically heated rapidly and homogeneously due to its high electrical conductivity and enhanced heat transfer efficiency. Its Joule-heating effect acts as an effective active stimulation of the variable stiffness and Shape-memory effect. The CFF-reinforced epoxy-based SMP composite was manufactured into a Corrugated Shape to obtain extreme mechanical anisotropy. The Corrugated sheet shows a low in-plane stiffness to minimize the actuation energy, while it also possesses high out-of-plane stiffness to transfer the aerodynamic pressure load. Its mechanical properties, electrical heating performance, and Shape-memory effect were investigated using experiments. The results show that the proposed SMP composite exhibits extreme mechanical anisotropy, considerable deformation ability, and variable stiffness induced by Joule heating without an external heater.
Atul Srivastava - One of the best experts on this subject based on the ideXlab platform.
-
investigation of the effect of blockage ratio on flow and heat transfer in the wake region of a cylinder embedded in a channel using whole field dynamic measurements
2020Co-Authors: Apoorv Vyas, Biswajit Mishra, Atul SrivastavaAbstract:Abstract Non-intrusive field measurements in the wake region of a circular adiabatic cylinder fitted in a channel are reported. The top wall of the channel is subjected to constant heat flux while maintaining the bottom wall and the cylinder under adiabatic condition. The cylinder diameter has been varied to achieve three different blockage ratios (D/H) of 0.25, 0.38 and 0.5. Experiments are performed in the range of 63≤Re ≤ 165 with water as the coolant fluid under hydrodynamically fully developed and thermally developing conditions. Effect of blockage ratio on heat transfer enhancement capability, its capacity to alter the flow physics by modifying the size of vortices, the downstream distance they travel and the Reynolds number at which the vortices get initiated, is reported. Path-integrated temperature distribution in the channel has been mapped through the classical form of Mach Zehnder interferometer. The temperature distribution thus obtained has been used to determine the variations in local heat transfer coefficient along the length of the top horizontal surface of the channel. Schlieren deflectometry is used to quantify the vortex shedding frequency under three different blockage ratio regimes. The experimentally obtained results are benchmarked and validated by performing numerical simulations using FLUENT. It has been observed that a decrease in blockage ratio at a constant Re leads to alterations in the size of the generated vortices, which manifest as an increase in the vortex shedding frequency. Vortex shedding is seen to get initiated at relatively lower value of Re (= 65) when the blockage ratio is low (D/H = 0.25). However, when the wake transition to three-dimensionalities is considered, an increase in blockage ratio from D/H = 0.25 to 0.5 leads to an increase in the value of transition Re (165 for D/H = 0.5). It is observed that the vortices travel maximum downstream distance for blockage ratio of 0.38. For all blockage ratios, due to vortex shedding, the thermal boundary layer assumes a Corrugated Shape and aids in enhancing the heat transfer rates from the channel surface.
Fang Xie - One of the best experts on this subject based on the ideXlab platform.
-
electro active variable stiffness Corrugated structure based on Shape memory polymer composite
2020Co-Authors: Xiaobo Gong, Fang Xie, Liwu Liu, Yanju Liu, Jinsong LengAbstract:Shape-memory polymers (SMPs) can adjust their stiffness, lock a temporary Shape, and recover the permanent Shape upon an appropriate stimulus. They are applied in the field of morphing skins. This work presents a variable-stiffness Corrugated sheet based on a carbon fiber felt (CFF)-reinforced epoxy-based SMP composite that shows variable stiffness and extreme mechanical anisotropy for potential morphing skin applications. The Corrugated sheet exhibits a variable stiffness with a change in temperature, which can help the skin adjust its stiffness according to different service environments. The Corrugated sheet can be electrically heated rapidly and homogeneously due to its high electrical conductivity and enhanced heat transfer efficiency. Its Joule-heating effect acts as an effective active stimulation of the variable stiffness and Shape-memory effect. The CFF-reinforced epoxy-based SMP composite was manufactured into a Corrugated Shape to obtain extreme mechanical anisotropy. The Corrugated sheet shows a low in-plane stiffness to minimize the actuation energy, while it also possesses high out-of-plane stiffness to transfer the aerodynamic pressure load. Its mechanical properties, electrical heating performance, and Shape-memory effect were investigated using experiments. The results show that the proposed SMP composite exhibits extreme mechanical anisotropy, considerable deformation ability, and variable stiffness induced by Joule heating without an external heater.
Liwu Liu - One of the best experts on this subject based on the ideXlab platform.
-
electro active variable stiffness Corrugated structure based on Shape memory polymer composite
2020Co-Authors: Xiaobo Gong, Fang Xie, Liwu Liu, Yanju Liu, Jinsong LengAbstract:Shape-memory polymers (SMPs) can adjust their stiffness, lock a temporary Shape, and recover the permanent Shape upon an appropriate stimulus. They are applied in the field of morphing skins. This work presents a variable-stiffness Corrugated sheet based on a carbon fiber felt (CFF)-reinforced epoxy-based SMP composite that shows variable stiffness and extreme mechanical anisotropy for potential morphing skin applications. The Corrugated sheet exhibits a variable stiffness with a change in temperature, which can help the skin adjust its stiffness according to different service environments. The Corrugated sheet can be electrically heated rapidly and homogeneously due to its high electrical conductivity and enhanced heat transfer efficiency. Its Joule-heating effect acts as an effective active stimulation of the variable stiffness and Shape-memory effect. The CFF-reinforced epoxy-based SMP composite was manufactured into a Corrugated Shape to obtain extreme mechanical anisotropy. The Corrugated sheet shows a low in-plane stiffness to minimize the actuation energy, while it also possesses high out-of-plane stiffness to transfer the aerodynamic pressure load. Its mechanical properties, electrical heating performance, and Shape-memory effect were investigated using experiments. The results show that the proposed SMP composite exhibits extreme mechanical anisotropy, considerable deformation ability, and variable stiffness induced by Joule heating without an external heater.
