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Online since: July 2014
Authors: Jun Wu
It is important to construct a micromechanical constitutive model containing the component and microstructure information with micromechanical approaches in order to predict mechanical properties of asphalt mixture [4-6].
After the above simplification, the micromechanical approaches can be applied to investigate mechanical behaviors of asphalt mixture.
The equivalent inclusion method proved to be effective for estimating a homogenized elastic property of composite materials, and able to be extended to investigate viscoelastic problems, such as the effective viscoelastic properties of asphalt mixture, with the elastic-viscoelastic correspondence principle [8].
“Numerical simulation of mechanical behavior of asphalt mix.”
Factors affecting the stiffening potential of mineral fillers.”
Online since: February 2011
Authors: Bao Wei Li, Tuan Zhao, Kai Ming Wei, Zhan Yong Gao, Da Qiang Cang
Thus, based on the nucleation and crystallization technological parameter measured by means of DSC, we can obtain the higher mechanical property.
The optimal nucleation temperature and nucleation time will be received when one of the two factors changes.
The mechanical property reached to the maximal value when at the peak 730℃, while the mechanical property change was very small between 730℃ and 740℃.
However, if the temperature increased to 760℃ or above, it was bad for samples to form nucleation, and the growth of crystal was inhomogeneous which affected the mechanical property.
For this reason, nucleated at 730℃ for 2h and treated by crystallization, the content of crystalline phase was suitable, grain were homogeneous and mechanical property was better.
Online since: January 2015
Authors: Svetlana Belyaeva, Yury Barabanshchikov, Arina Avdeeva, Maikel Perez
Shows the influence of the proportion of glass reinforcement on the physico-mechanical properties of rod fiberglass reinforcement.
Fig. 2 Dependence of strain of time exposure Conclusion Water absorption is not dependent on the degree of reinforcement and divergence of results due, apparently, technological factors.
In addition to the mechanical properties of the percentage content of reinforcing filler affects the porosity which can be attributed to incomplete impregnation of the fiber-shaped filler.
Mechanical properties of glass-fiber reinforcement along the reinforcing fibers increases almost linearly with the degree of reinforcement.
Deformation properties, on the contrary, decreased with increasing content of fiberglass reinforcement reinforcing fibers.
Online since: December 2010
Authors: Zong Hai Hong, Zhao Mei Xu, Hai Bing Wu
But many factors affect the quality of the laser cladding layer and there are many uncertain factors or difficult to uncertain factors during the process, including the stability of powder feeding system, the focusing capability of laser nozzle, laser power, laser beam diameter and scanning speed[1~5].
The intersection boundary line of substrate and cladding layer was circular arc depressed to the substrate and the arc was fluctuation. 3.2 Relations of influence factors to quality of cladding layer and process parameters. 3.2.1 factors affecting the width of cladding layer The factors mostly affecting the width of cladding layer is laser beam diameter, then scanning velocity, and finally laser power.
Fig . 4 Related curve between surface quality of cladding layer with technology parameter 3.2.2 factors affecting the depth of cladding layer The most remarkable factors affecting the thickness first was scanning velocity , and second was laser power.
The factors affecting the quality of the cladding layer firstly are scanning velocity, secondly laser power.
Microstructure and mechanical property analyses of the metal parts direct fabricated by laser cladding [ J ].
Online since: January 2013
Authors: Zhi Long Xu, Ju Dong Liu, Jin Kui Xiong, Wei Yuan
The results show that: chamfer height size affected the two-side direction burr’s size significantly and the influence of chamfer degree α is general.
Introduction The grinding-hardening is a new technology that utilizes the heat and mechanical composite effect induced in grinding to quench the surface of steel directly.
It realizes the integrated manufacturing of grinding and surface hardening and has wide application prospects in the field of grinding machine and improving surface properties of metal material[1-2].
Owing to Fav is bigger than19.0,so that grinding parameter apvw is highly significant factor to effect the burr’s size; meanwhile, Fh is bigger than 9.0, so chamfer height h is general significant factor to effect the burr’s size; and chamfer degree α is insignificant factor.
But the chamfer area could not be filled with the burr formed in grinding-hardening machine, so it should choose the parameter as follow: ap=0.2mm, vw=0.2m/min, h =1.0mm and α=20 o Conclusions While chamfer the workpiece, among all factors that effectted the burr’s size, grinding parameter apvw and chamfer height are highly significant factor and chamfer degree α is general significant factor.
Online since: March 2015
Authors: Hai Dan Yu, Shu Xian An, Hao Yu, Han Zhao, Hui Min Liang
In recent years, substantial studies and analysis have been carried out by targeting at the influential factors of contacts breaking characteristics.
For the spring system of the relay, the rigid part was built in UG software and then it was loaded into the ADAMS modeling environment while setting the material properties.
Then, it was loaded into the ADAMS to set modal properties.
In conclusion, thermal performance has not been adversely affected, as shown in Fig. 12 and Fig. 13.
The vibration characteristics meets the requirement of more than 2000Hz and thermal performance has not been adversely affected.
Online since: April 2016
Authors: Ling He, Wei Min Sun, Wen Sheng Li, Qi Zheng Dong
The effects of some factors on the product preparation were investigated, such as the pH value of precursors; the proportion of citric acid; calcination temperatures, and then the optimal synthetic conditions was obtained.
X-ray diffraction, scanning electron microscopy, transmission electron microscopy and photoluminescence spectroscopy were adopted to detect the structure, grain size, morphology and optical properties of the nanofibers, respectively.
The product is easy to form impurity phase during the calcination process, which is not conducive to luminescent properties.
Especially one-dimensional (1D) nanostructures including nanowires, nanofibers, nanotubes, and nanorods have attracted more attention because of their unique properties, such as high luminescence efficiency, superior mechanical toughness, metal insulator transition, and lowered threshold [1].
Some synthesis factors, that is, pH value of precursors, the proportion of citric acid and the calcination temperatures, were discussed and then the optimal synthetic condition was obtained.
Online since: August 2006
Authors: Chuan Xian Ding, Soo Wohn Lee, Bo Young Hur, 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.
Online since: September 2012
Authors: Yong Gang Zhang, Shao Jun Bai, Peng Fei Huang, Zhen Yang Lu
Verified by testing resistance, the change rate of the wire feed speed is slightly, which proves that the new system has good mechanical properties and a stable speed.
The armature voltage negative feedback regulation having compensation effect on the fluctuation of voltage can only achieve the stability of armature voltage, without playing a regulatory role due to load changes, its mechanical properties are relatively weak.
The Basic Principle of Detecting Motor Speed [3] Wire feed system usually adopts DC motor as it has good speed regulation, large starting torque and relatively strong mechanical properties.
In the process of wire feed, the main factor which affects the speed is resistance.
It proves that the system has good mechanical properties
Online since: October 2010
Authors: Shu Lin Wang, Lai Qiang Li, Sheng Juan Li, Bo Xu
We first prepared modified electrode material by dry roller vibration milling method and investigated the properties of electrode materials prepared by different manufacturing techniques and their microstructure evolution.
The analysis showed the impression of surface area, pore volume and pore size along with three factors.
For pore size none of three factors affected distinctly.
Table 1 Level of Factors in Experiments Factor Lever A B C Milling time ,t [h] Additive [15%] Excited frequency, f [rpm] 1 1 Graphite 700 2 3 MnO2 800 3 5 Boric acid 900 Fig.5 Sketch of porous structure of electrode material:a-MnO2 electrode; b-Activated carbon Conclusion We used for the first time the roller vibration milling to prepare active carbon (AC) nano-particles in dry mode and at room temperature.
On the other hand, we analyzed different preparation factors by orthogonal experiment and found the porous MnO2 is desirable additive of active carbon.
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