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Online since: July 2015
Authors: Achim Rösiger, Ralf Goller
Due to their superior thermo-mechanical properties CMCs are also highly suitable for components in gas turbines [3].
Some properties taken from the material data sheet are shown in the table in Fig. 4.
Fig. 4 C/C-SiC test material properties and a microscopical image of a through cut showing the microstructure Tooling.
Both factors increase with increased feed rate.
The increasing experimental scatter might refer to higher damage values respectively to higher damage factors.
Online since: June 2019
Authors: Rong Fan, Xiu Xia Zhang, Yuan-ze Ma
Due to the developed pore structure, high specific surface area, low cost, accessible raw materials and stable physical and chemical properties, activated carbon has caused high attention of society.
In this process, a certain proportion of activation agent is added to the carbon source to carry out modified impregnation treatment, then the AC with special properties is prepared through high temperature carbonization and activation.
The conditions for the regeneration of ACs are determined by the type of activated carbon and the properties of adsorption materials.
Biological regeneration method has the advantages of simple operation, low operation cost, but the rate of biological decomposition is too slow, the regeneration time is very long, and the regeneration efficiency is affected by many factors.
(In Chinese) [7] L.P.Wang, Preparation and Capacitive Properties of Ordered Mesoporous Carbon-based Materials for Electrochemical Supercapacitors (Ph.D., Dalian university of technology, China 2012), p.9
Online since: November 2015
Authors: Anand Joshi, Nipun Gosai
Electrical discharge machining (EDM) is regarded as one of the most effective approaches to machining Ti–6Al–4V alloy, since it is a noncontact electro-thermal machining method, and it is independent from the mechanical properties of the processed material.
Using these plots one can actually predict the best combination of factors to meet experimental goals.
Analysis of variance (ANOVA) is performed for analyzing design factors.
MRR tends to increase, considerably with increase in peak current for any value of other factors.
As our goal is to minimize the tool wear rate, we obtained minimum value at lower values of design factors.
Online since: May 2015
Authors: Chung Ma, Yu Hsiang Tsai, Ching Yen Ho
This property makes submicron machining achievable with laser irradiation.
An another key problem in the application of the models based on TTM for quantitative description of the kinetics of the energy redistribution in the irradiated metal is the temperature dependent thermophysical properties.
These dimensional parameters include electron heat capacity ce, lattice heat capacity cl, electron-phonon coupling factor G, optical penetration depth and evaporation latent heat .
Figure 4 shows the effect of electron-phonon coupling factor on the ablation depth per pulse.
Fig. 4 Variation of ablation rate with laser fluence for different electron-phonon coupling factors.
Online since: August 2005
Authors: Xiao Mei Liu, H.J. Liu, H.Y. Li, Jian Cheng Fang
Comparing Mechanism of Mechanical and Electrochemical Finishing Mechanical Finishing.
Properties changed after reaction, the surface can be ground subsequently more efficiently and effectively by fixed abrasive, for example, whetstone etc.
It is universally agreed that in general applications the most important factor of surface topography is the roughness height.
The concave surface and heat-affected layer can be gained at one time; fig.5(c) and fig. 5(d) is the surface topography of PECF and ECMF namely ECF surface.
The strong or weak adhesiveness directly affect on the workpiece operating condition, as much performance and lifetime.
Online since: February 2012
Authors: Zhong Xia Liu, Pei Chung Wang, Jun Wei Wang
These properties are inherently related to its hexagonal lattice structure.
Gleeble Thermal-Mechanical Test.
Figure.1 shows the effect of preheat temperature and strain rate on the mechanical properties of AZ31 magnesium alloys..
These small cracks may affect the quasi-static strength and fatigue performance of the joints.
While cracking play a less significant role in static failure, the mechanical interlock becomes a dominant factor.
Online since: July 2013
Authors: Yun Huang, He Ping Wei, Zhao Yang Liu
As the grinding force and grinding temperature is high in conventional wheel grinding, it is easy to cause grinding burns, adhesive wear, thus affecting workpiece surface quality seriously.
The cutting surface distribution shown as shown in fig. 1.[3]After cutting processing, surface integrity requires superficial layer intact, the mechanical and physical properties, microstructure, etc all can meet the application, but also needs to ensure certain service life.
To achieve the above goals, using experimental method to research the surface integrity of titanium alloy TC4 in abrasive belt grinding, mainly include the influence factors of the surface roughness, surface morphology, residual stress, and consequently get reasonable process parameters for better surface integrity of titanium alloy TC4 in abrasive belt grinding.
[7] Hongfei Shu,Yucan Fu:surface roughness research of titanium alloy in belt grinding: submitted to Journal of Mechanical Manufacturing Research (2009)
[8] Yiping Zhang,Yi Qin:Study of surface integrality on high speed milling titanium: submitted to Journal of Mechanical Design and Manufacturing (2006)
Online since: November 2012
Authors: M. Lurdes Lopes, José Ricardo Carneiro, Luís Miguel Morais, Simão Pedro Moreira
This paper evaluates the effect of the installation process on the mechanical and hydraulic properties of non-woven geotextiles.
The changes occurred in the properties of the geotextiles were evaluated by mechanical and hydraulic tests.
The mechanical actions that geotextiles are subjected during the installation process can cause unavoidable changes in their physical, mechanical and hydraulic properties.
However, in most cases, the damages are only assessed in terms of mechanical properties (often by tensile tests).
Thus, the effects of DDI in the mechanical properties are less pronounced for geotextiles with higher mass per unit area.
Online since: December 2014
Authors: Ning Chen, Zhi Hua Ma, Ping Bai, Qiu Yang Liu
Under the impact of environment, climate, conservation conditions and other factors, forms of bridge disease vary in different areas.
However, affected by load capacity, environment and material deterioration, as well as other factors in design and build, bridges are suffering from various kinds of diseases during their construction and use[1].
(2)Reasons for Bridge Diseases 1) Beam Bridge Reinforcing bars rustiness is an important factor that causes damage in reinforcing bars and concrete elements.
Considering environmental factors in Nantong, starting from disease analysis, this paper has studied the maintenance strategy according to the type, extent and causes of concrete bridges diseases.
When we repair a bridge, it’s necessary to consider not only the s mechanical characteristics and material properties, but also the construction convenient and the traffic. but also consider the economic constraints and many other conditions.
Online since: January 2013
Authors: Ying Yu, Yu Xin Zuo, Zhao Zhang, Chun Cheng Zuo
Morphology Transition of Diblock Copolymer with Nanoparticles Confined in Cylindrical Nanopores Ying YU1, a, Yuxin ZUO1, b, Zhao ZHANG1, c and Chuncheng ZUO1, d 1 College of Mechanical Science and Engineering, Jilin University, Changchun, 130025, China ayuying11@mails.jlu.edu.cn, bzuoyx11@jlu.edu.cn, czhaozhang11@mails.jlu.edu.cn, dzuocc@jlu.edu.cn Keywords: diblock copolymer, morphology transition, self-assembly, nanoparticles Abstract.
Coarse-grained molecular dynamics simulations on self-assembly behavior of diblock copolymers (DCP) with nanoparticles confined in cylindrical nanopores are perfomed to study the morphology transition of DCP affected by the confined ratio of the cylindrical confinement diameter to the block copolymer domain spacing, the wall-polymer interactions, the particle-polymer interaction potential and the component concentration.
Introduction A cylindrical confinement has been proved to have a significant influence on the morphology transition of DCP.Another important factor affecting morphology transition is the nanoparticles(NPs) added to the self-assembly system.
The attractive potential used to model the equilibrium properties of DCP melts is the Lennard- Jones potential which is cut and shifted at different values from that presented in Eq. 3
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