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Online since: July 2017
Authors: Yong Quan Wang, Tian Jiao Chen, Wahab Abdul Ghafar
At present, the finite element analysis has been an effective method to study the mechanical properties of steel bar drawing.
In order to study the influence of adhesive bond strength of chemically-bonded rebar mechanical properties, the constitutive relation of the bonded rebar slip of test results was referenced.
Introduction The chemical anchorage reinforcement is widely applied in technology of post anchor connection technology, existing research capacity and mechanical properties of the steel bar were mostly limited to the experimental study on single bar drawing.
At present, the finite-element analysis has been an effective method to study the mechanical properties of the steel bar drawing.
Affected by the stress redistribution, the stress concentration was developed from shallow to deep along the bond depth.
Online since: May 2013
Authors: Yue Jun Ma, Ji Tao Zhao, Yu Min Yang
They are main factors to cause energy losses of the centrifugal pump.
Calculation results and analyses The designed parameters of the centrifugal pump in different operation points and properties of fluid that are used in computation are shown in Table 1.
Table 1 The designed parameters of centrifugal pump in different operation points and properties of fluid.
Wake is formed by some factors including developed boundary layer, developed second flow and separated flow in the impeller, which affect or promote each other.
Chinese Journal of Mechanical Engineering, 1, 59-62
Online since: January 2012
Authors: Halit S. Türkmen, Onur Coskun
Mechanical properties, bending stiffness and free vibration frequency of the sandwich beam are investigated.
These outstanding properties are also followed by lower lateral deformations, higher buckling resistance and higher natural frequency [1].
According to the characteristic of these materials, which are more complex than the metallic ones, a damage due to fatigue could affect unfavorably the interactions of face sheets, core and matrix form that may give overall effect on the sandwich structure properties.
Notch factor and an amplitude factor were described to consider a prediction model.
A map of a failure affected by material, beam geometry and loading conditions was described.
Online since: February 2012
Authors: Lorelei Gherman, Irina Grigoraş (Beşliu), Oana Dodun, Margareta Coteaţă, Hans Peter Schulze, Laurenţiu Slătineanu
On the other hand, one of the input factors for the electrical discharge machining is the workpiece material machinability.
As a rule, the machinability is the technological property of the workpiece material to be machined in the best conditions for the producer; this means that the material could be machined with high material removal rate, with a low wear of the tool, with a minimum mechanical solicitation of the machining equipment, with obtaining a low roughness of the machined surface, with a convenient form of the detached chips.
It is expected that during the electrical discharge machining, the electrode wear is influenced by various factors; these factors could be grouped in factors which characterize the workpiece material (the melting temperature, the vaporizing temperature, the thermal conductivity, the thermal capacity), the values of the machining electrical parameters (pulse frequency, duration of the electric pulse, duration of the pause between two successive electric pulses, mean value of the electric intensity), the characteristics of the dielectric fluid and the way in which the electric fluid accedes in the work zone (by immersion, through the electrode, by injection or suction), the way in which the particles of detached material from electrodes are removed from the machining zone, the motions specific to the machining schema.
Being a factor of main technological interest, the electrode wear was a subject of the researchers preoccupations.
He considered that the electrode wear could be appreciated by means of two measurements, namely the end wear and the corner wear [4]; he formulated also the opinion that due to the use of transistorized, pulse-type power supplies, the electrolytic copper could be preferred as electrode material, due to its favorable properties from the requirements of technological interest.
Online since: April 2014
Authors: Viboon Saetang, S. Prombanpong, P. Tevinpibanphan
This is due to the fact that one of the critical quality factors of this product is its appearance.
Ersoy and Kose investigated the relationship between easiness to polishing and mechanical properties of marbles [7].
There are three factors in this study but only two main factors, namely force and polishing time, have been found to play the significant role to the surface roughness of stainless steel.
The relationship between easiness to polishing and mechanical properties of marbles.
Chemical mechanical polishing of stainless steel foil as flexible substrate.
Online since: August 2011
Authors: Yan Li, Fang Feng, Wen Qiang Tian, Kotaro Tagawa
The torque performance of the SB-VAWT is greatly affected by the blade airfoil.
In this study, bend which is one of the most important factors which affects the starting characteristics of the SB-VAWT was researched by numerical computations in a CFD package based on the 2 dimensions incompressible steady flow.
It can be inferred that the mechanical properties of wind turbine become more stable with the increasing of curvature of blade.
The mechanical properties of wind turbine become more stable with the curvature of blade airfoils increasing.
Online since: December 2012
Authors: Xiao Hua Sun, Shuang Hou, Zhi Meng Luo, Cai Hua Huang, Zong Zhi Hu
Enhanced the dielectric and tunable properties of BZNT thin films through adjusting annealing process Xiaohua Suna, Shuang Hou, Zhimeng Luo, Caihua Huang, Zongzhi Hu School of Mechanical and Material Engineering, China Three Gorges University, Yichang 443002, China.
aemail : mksxh@yahoo.com.cn Keywords: BZNT, rf magnetron sputtering, Dielectric properties, Tunability.
Jian-Gong Cheng et al reported the dielectric properties of laser-annealed BZN films and found the crystallinity and dielectric properties improved after a postannealing at 400 °C for 2 h in an oxygen atmosphere [10].
These two aspects all will affect the dielectric properties of BZNT thin films.
Samples Tunablity (%) Loss FOM BZNT20 10.94 0.00374 29.25 BZNT400 11.23 0.00355 31.63 BZNT500 13.61 0.00298 45.67 As we know, a tunable device with good dielectric properties must get advantage of a high tunability and low dielectric loss factor.
Online since: March 2016
Authors: Xu Wang, Lin Li, Ying Zi Zhao, Zi Yu Zhu, Ke Lan Xiang
Fig. 1 Effect of gel concentration on compressive properties of coated ceramic Fig. 2 Effect of core-wall ratio on compressive properties of coated ceramic.
The effect of core-wall ratio on compressive properties of coated ceramic is shown in Fig. 2.
Fig. 3 Effect of emulsifier concentration on compressive properties of coated ceramic Table 1 is the influence of water/oil rate on resist compressive properties of coated ceramic.
Table 1 Effect of water/oil rate on compressive properties of coated ceramic water/oil rate 1/6 1/8 1/10 1/12 Compression force/N 88.88 94.23 99.12 82.77 Table 2 Effect of emulsification time on compressive properties of coated ceramic Emulsification time 10min 20min 30min Compression force/N 87.57 94.29 83.32 Emulsification time can affect the degree of emulsification directly.
And the basic properties of ceramic and coated ceramic was tested and compared.
Online since: May 2015
Authors: Ján Slota, Marek Šiser
The quality of the products from sheet metal forming is severely influenced by the die design, material properties of sheet metal, lubricating condition, and other processing parameters.
If the controllable variables are not chosen properly or they do not match with the variances of the noise factors, the sheet metal forming process may turn out products with defects such as fracture, wrinkling, thinning or thickening.
Today forming simulations are mainly used in a trial and error fashion in order to develop forming processes that can produce parts with the requested properties.
Mechanical properties and material formability parameters are shown in the Table 1.
Table 1 Mechanical properties of AISI430 stainless sheet with thickness of 0.4 mm Direction [°] Rp0,2 [MPa] Rm [MPa] Ag [%] r [-] rn [-] n [-] nm [-] C [MPa] 0 330 502 20.2 0.95 1.08 0.200 0.20 843 45 365 541 20.0 0.90 0.204 90 361 549 19.9 1.40 0.197 Final deep-drawn part with diameter of 490 mm was manufactured from the circular blank with diameter of 590 mm.
Online since: August 2006
Authors: Chuan Xian Ding, Bo Young Hur, Soo Wohn Lee, Ho Sung Aum, Yi Zeng, Huang Chen, Tae Ho Kim
Characterization and Photocatalytic Properties of Plasma Sprayed TiO2 Coatings Deposited from Nanoparticles H.
Their photocatalytic properties were discussed in relation to phase composition and microstructure.
The photocatalytic properties of the other two coatings are ranked as ST and KT in descending order [3].
Particle size is generally one of the most important factors, because it can directly affect the number of active sites [4].
Another important factor is the anatase content.
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