scholarly journals Microgripper Based on Simple Compliance Configurations, Improved by Using Parameterization

Actuators ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 140
Author(s):  
Pedro Vargas-Chable ◽  
Jose Mireles Jr-Garcia ◽  
Sahiril Fernanda Rodriguez-Fuentes ◽  
Samuel Isai Valle-Morales ◽  
Margarita Tecpoyotl-Torres
Keyword(s):  
Temperature Distribution ◽  
Carbon Fiber ◽  
Low Temperature ◽  
Reaction Force ◽  
Ansys Software ◽  
Permissible Stress ◽  
Voltage Range ◽  
Analytical Simulation ◽  
Displacement Force ◽  
Resistive Model

The design of a novel electrothermal microgripper device is shown, which is based on an improved chevron type actuator developed considering their elements parameterization, whose resistive model is also provided. The performance of the microgripper’s parameters, such as displacement, force, and temperature distribution, with convection for the voltage range from 0 up to 5 V, is evaluated through numerical and analytical simulation. Microgripper design was also improved with aid of parameterization. The effect on the microgripper performance due to its thickness is also analyzed, finding a considerable increment in force, when thickness increases. Its main advantage is given by the simplicity of the compliance arrangement of the microgrippers jaws. Considering convection, when 5 V are applied, 37.72 °C was generated at the jaw’s tips of the Improved Microgripper 2 (IMG2), implemented with silicon, this relatively low temperature increases its capabilities of application. When the IMG2 is implemented with polysilicon, its response is competitive comparing with a more complex microgripper, increase of displacement (50%) is shown, but a decrement of force (30%). The diameters allowed for the subjection objects are found between 84.64 µm and 108 µm, with weights lower than 612.2 µg. Some tests of subjection were performed using microcylinders of Au, glass ceramic, polycarbonate and carbon fiber, showing a permissible stress on them, considering its Young’s modulus, as well as the total reaction force induced. All simulations were done on Ansys software. The results demonstrate the feasibility of the future microgripper fabrication.

Low-temperature fabrication of crystalline MnCoO spinel film on porous carbon paper for efficient oxygen evolution reaction

2021 ◽  
Author(s):  
Sunglun Kwon ◽  
Ha Eun Lee ◽  
Donghoon Han ◽  
Jong Hyeon Lee
Keyword(s):  
Thin Film ◽  
Carbon Fiber ◽  
Low Temperature ◽  
Oxygen Evolution ◽  
Porous Carbon ◽  
Oxygen Evolution Reaction ◽  
Carbon Paper ◽  
Carbon Fiber Paper

A thin film of MnxCo3−xO4 (MnCoO) nanocatalyst on a porous carbon fiber paper (CFP) electrode for efficient oxygen evolution reaction (OER).

scholarly journals High Mechanic Enhancement of Chopped Carbon Fiber Reinforced-Low-Density Unsaturated Polyester Resin Composite at Low Preparation Temperature with Facile Polymerization

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4273
Author(s):  
Jian Zhang ◽  
Xiaojun Wang ◽  
Xinjun Fu
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Low Temperature ◽  
Surface Defect ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Unsaturated Polyester Resin ◽  
Low Density ◽  
Fiber Reinforced ◽  
Preparation Temperature

Chopped carbon fiber-reinforced low-density unsaturated polyester resin (CCFR-LDUPR) composite materials with light weight and high mechanical properties were prepared at low temperature and under the synergistic action of methyl ethyl ketone peroxide (MEKP-II) and cobalt naphthenate. Optimal preparation conditions were obtained through an orthogonal experiment, which were preparation temperature at 58.0 °C, 2.00 parts per hundred of resin (phr) of NH4HCO3, 4.00 phr of chopped carbon fibers (CCFs) in a length of 6.0 mm, 1.25 phr of initiator and 0.08 phr of cobalt naphthenate. CCFR-LDUPR composite sample presented its optimal properties for which the density (ρ) was 0.58 ± 0.02 g·cm−3 and the specific compressive strength (Ps) was 53.56 ± 0.83 MPa·g−1·cm3, which is 38.9% higher than that of chopped glass fiber-reinforced low-density unsaturated polyester resin (CGFR-LDUPR) composite materials. Synergistic effects of initiator and accelerator accelerated the specific polymerization of resin in facile preparation at low temperature. Unique “dimples”, “plate microstructure” and “surface defect” fabricated the specific microstructure of the matrix of CCFR-LDUPR composite samples, which was different from that of cured unsaturated polyester resin (UPR) with “body defect” or that of CGFR-LDUPR with coexistence of “surface defect” and “body defect”.

Effect of Zinc Pot Designs on Flow and Temperature Distribution in Hot-Dip Galvanizing Process

2016 ◽  
Vol 826 ◽  
pp. 99-104
Author(s):  
Guang Rui Jiang ◽  
Li Bin Liu ◽  
Huang Xiang Teng ◽  
Fang Qing Kong
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Temperature Distribution ◽  
Low Temperature ◽  
Zinc Level ◽  
Heating Power ◽  
Liquid Zinc ◽  
Base Case ◽  
Computational Fluid Dynamics Cfd ◽  
Temperature Liquid

s In this study, Computational Fluid Dynamics (CFD) was used to simulate the flow and temperature distribution in zinc pot of hot-dip galvanizing process. The flow and temperature distribution in a base-case zinc pot was compared to that in other two optimized zinc pots, one of which had a dam between ingot and snout and another one had a reduced heating power. The simulation shows that the dam impedes the flow of low temperature liquid zinc around zinc ingot to strip and increases the fluctuation of zinc level. By reducing the heating power, however, the fluctuation of zinc level could be suppressed.

scholarly journals Excellent Temperature Performance of Spherical LiFePO4/C Composites Modified with Composite Carbon and Metal Oxides

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Bao Zhang ◽  
Tao Zeng ◽  
Jiafeng Zhang ◽  
Chunli Peng ◽  
Junchao Zheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Electrochemical Performances ◽  
Initial Discharge Capacity ◽  
Sintering Process ◽  
Capacity Retention ◽  
Voltage Range ◽  
Temperature Performance ◽  
Initial Discharge ◽  
Composite Carbon

Nanosized spherical LiFePO4/C composite was synthesized from nanosized spherical FePO4·2H2O, Li2C2O4, aluminum oxide, titanium oxide, oxalic acid, and sucrose by binary sintering process. The phases and morphologies of LiFePO4/C were characterized using SEM, TEM, CV, EIS, EDS, and EDX as well as charging and discharging measurements. The results showed that the as-prepared LiFePO4/C composite with good conductive webs from nanosized spherical FePO4·2H2O exhibits excellent electrochemical performances, delivering an initial discharge capacity of 161.7 mAh·g−1at a 0.1 C rate, 152.4 mAh·g−1at a 1 C rate and 131.7 mAh·g−1at a 5 C rate, and the capacity retention of 99.1%, 98.7%, and 95.8%, respectively, after 50 cycles. Meanwhile, the high and low temperature performance is excellent for 18650 battery, maintaining capacity retention of 101.7%, 95.0%, 88.3%, and 79.3% at 55°C, 0°C, −10°C, and −20°C by comparison withthat of room temperature (25°C) at the 0.5 C rate over a voltage range of 2.2 V to 3.6 V, respectively.

Experimental investigation and numerical simulation on continuous wave laser ablation of multilayer carbon fiber composite

2015 ◽  
Vol 231 (8) ◽  
pp. 674-682 ◽  
Author(s):  
Lianchun Long ◽  
Yao Huang ◽  
Jinfeng Zhang
Keyword(s):  
Laser Ablation ◽  
Temperature Distribution ◽  
Carbon Fiber ◽  
Continuous Wave ◽  
Fiber Composite ◽  
Rear Surface ◽  
Peak Temperature ◽  
Transient Temperature ◽  
Carbon Fiber Composite ◽  
Carbon Fiber Epoxy

Laser beam machining is one of the most widely used advanced processing techniques, which can be applied to compound materials. As a large number of photons are absorbed into the composite, the subsequent local heat storage, charring and potential delamination make the study for the effect of laser on complex materials become significant. In this paper, a carbon fiber epoxy composite laminated sheet is irradiated by continuous wave chemical oxygen iodine laser. The peak temperature of front surface, the temperature distribution of rear surface, and the appearance of ablation zone are presented. Further, based on the birth–death elements technique of finite element method, a three-dimensional model for simulating the transient temperature distribution and material removal has been developed under the same condition. The results reveal that the peak temperature of irradiated region ranges from 2800 K to 3100 K, and the center point shows a higher temperature rise rate than the surroundings in the irradiated zone. The measured data and predicted data are in a good consistency, which suggests that the numerical model is appropriate for simulating laser ablation of carbon fiber epoxy composites.

On the optimum process parameters of infrared curing of carbon fiber-reinforced plastics

2020 ◽  
Vol 28 (6) ◽  
pp. 433-439
Author(s):  
YO Alpay ◽  
I Uygur ◽  
M Kilincel
Keyword(s):  
Temperature Distribution ◽  
Carbon Fiber ◽  
Material Surface ◽  
Optimum Process ◽  
Primary Concern ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Autoclave-cured carbon fiber-reinforced plastics (CFRPs) are widely used in aerospace and aviation industries. However, they have a limited field in automotive or marine industries in which both the unit costs of the products and applicability to mass production are of primary concern. Therefore, out-of-autoclave (OoA) processed products having similar mechanical properties with autoclave cured ones have been extensively studied. In this study, infrared (IR) curing, an OoA curing method, was investigated. The aim of the study is to propose a reliable temperature control method for an IR CFRP curing oven. A methodology that provides the surface and through-thickness temperature distribution of IR cured epoxy matrix CFRP was introduced. Optimum ply number and the distance between the heat source and the material were determined. Material surface was separated into nine virtual regions and region-based thermal evaluations were made by means of the thermal camera images and thermocouple data. Temperature distribution through thickness was determined. When designing a robust IR thermoset CFRP curing process, one should consider the temperature distribution on the surface and through the thickness of the material.

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