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Online since: February 2014
Authors: Hao Liu, Yong Xiang Zhu, Xiao Dong Luo, Qing Xia Wang
Microstructure and Properties of Pure Copper Fabricated by Equal Channel Angular Pressing[J].
Effect of equal channel angular pressing on microstructure and properties of pure copper[J].
Effect of Equal Channel Angular Extrusion on the Microstructure and Mechanical Properties of AZ31 Magnesium Alloy[J].
MICROSTRUCTURE AND PROPERTIES OF SiCp/Al PARTICULATED COMPOSITE BY ECAP USING Bc ROUTE[J].
Microstructure and properties of Bc route ECAP of 7090/SiC_p composite[J].
Online since: February 2019
Authors: Sergei Sergeevich Inozemtcev, Evgenij Korolev
In the elastoplastic state, mineral grains are enclosed by bitumen, which, at low stresses that do not even exceed the yield stress, has elastic properties, and at high stresses, visco-elastic properties.
In addition to temperature, asphalt concrete in a road structure is affected by climatic and natural factors in the form of rain, meltwater, etc.
These parameters are also affects the deformational stability of asphalt concrete.
Selection of effective compositions of asphalt concrete should be based on the laws of the change in physical and mechanical properties from the operating conditions of each component.
Technical efficiency, which depends on the level of improvement in the parameters of physical, mechanical and operational properties. 2.
Online since: September 2013
Authors: Xie Li
Factors which affect springback can be divided into two categories for a certain material of sheet.
The factors which are related to mould, like punch radius, die radius and die span etc.
The other factors are those which are related to the bending process like punch displacement friction coefficient etc.
T[1] researched on the examination of springback of sheet metals with several thicknesses and properties in bending dies.
Moving the punch up. 5.Measuring the bending angle after springback by the profile projector The basic mechanical properties of ST12 as expriments material are given in Table 1.
Online since: January 2012
Authors: Sheng Bao Wang, Jun Feng Su
MF-shells have the properties of good compact, high mechanical strength, thermal stability and low permeability [3].
The objective of this work was to fabricate and investigate the properties of micro- PCMs/gypsum-matrix building materials containing paraffin for thermal energy storage.
It indicates that although the higher emulsion can enhance the emulsion effect of PCM, the amount of shell material is the main factor affecting the E values.
The thermal stability properties of paraffin and microPCMs (core/shell weight ratios of 3/1, 2/1, 1/1 and 1/2) were evaluated by means of TGA as shown in Fig.3.
In this study, the microPCMs/gypsum should keep the thermal properties for a long-term service period.
Online since: August 2011
Authors: Jian Min Chen, Zu Chang Song, Xiao Dong Hao
Based on the actual project, Zhang Xiaodong [1] analyzed the process of grout, and he also analyzed and discussed the mechanism of the bearing capacity improved and the pile’s mechanical properties.
Hu Qingli [3] established a pile-soil analysis model, and he studied the properties of the soil, grout pressure and their effects on the pile bearing capacity.
In order to facilitate simulation, ignore some minor factors, make the following assumptions: (1) For the geological environment, the soil is elastic-plastic homogeneous soil, and not water saturated
Therefore there is a range between the growth of axial unit grout pressure and radious, and the range is related to the physical and mchanical properties of soil and compacted concrete.
And this variation depends on the physical and mechanical properties of the soil in the end of the pile.
Online since: November 2018
Authors: Merdaci Slimane
Effects of the exponent graded and porosity factors are investigated.
The present theory satisfies equilibrium conditions at the plate’s top and bottom faces without using shear correction factors.
The material properties of the FG plate, such as Young’s modulus E, are assumed to be function of the volume fraction of constituent materials.
The above power-law assumption reflects a simple rule of mixtures used to obtain the effective properties of the ceramic-metal plate.
The law of the modified mixture covering the porosity phases is used to roughly describe the properties of FGM plates with porosity.
Online since: January 2012
Authors: Zuhair M. Gasem, E. Bayraktar, S.S. Akhtar, Bekir Sami Yilbas
The mechanical properties of the alloy mainly vary with changing silicon content.
They monitored the cut quality through measuring kerf width, edge roughness, and size of the heat affected zone.
Equation (1) is used to determine the kerf width while energy coupling factor (A), laser power (P), and cutting speed (v) are considered as variables.
Table 1 gives the properties of the composites used in the simulations and Table 2 gives the simulation data.
Properties of composites used for the simulations r (kg/m3) 2.8135 k (W/m.K) 143 Cp (J/kgK) 878 Table 2.
Online since: August 2011
Authors: Wei Dong Jin
Initial surface of workpiece Finished surface of workpiece Abrasive grain of grinding wheel Tribological action Brittle fracture Plastic deformation Furrowing action Fig.1 Generating model of grinding surface Fig.2 Material removal modes in grinding process Influential factors of material removal modes in ultraprecision grinding In ultraprecision grinding, there will be four different material removal modes, and influential factors may be derived from grinding wheel, workpiece, grinding parameter and some accompanying phenomena[3].
Influential factors from grinding wheel include specialties of wheel and their truing and dressing state, and wheel specialties include wheel’s shape and dimension, types of abrasive material, grain size, concentration of abrasive, hardness of wheel, types of bond, organization structure and so on.
Influential factors from workpiece include mechanical properties of material and microstructure of parts, and mechanical properties involve strength, hardness, brittleness number and fracture toughness, microstructure means content of impurities, Porosity rate, dislocation defects and crystal grain size.
And for a certain cutting depth , there are: , And so, (3) Apparently, the ratio will decrease as the depth of cut decreases, and the specific depth at which a brittle-ductile transition occurs is a function of the intrinsic material properties, such as plasticity and brittleness.
Influential factors of dynamic balance state includes different initial state of wheel surface, non-liner electrolysis action, electrolyzing condition and machining parameters preseted only based on experience or guesstimate.
Online since: January 2012
Authors: Hu Ping Yang, Yao Xing Zhong, Wei Ling Wu
The ground grid of the substation are general network, which can be divided into long holes on the ground network and the square hole grid, such as the ground network of the same size, the hole in mesh network than the long hole in the steel to be used more, but the square hole in net pressure due to both properties, impact properties are superior to long-hole ground network.
However, in the absence of galvanized steel corrosion resistance when the discharge current can still be affected, but to network with discharge currents (including stray current) electrolytic corrosion, the corrosion resistance increased very little compared with ordinary carbon steel, not significant improvement in network anti-corrosion properties.
When the copper and other metals (steel, water pipes, pipe, cable sheathing, etc.) co-exist underground, the copper as the cathode is not affected by corrosion, corrosion of the latter.
Is a layer of steel corrosion, galvanized layer have some degree of corrosion resistance, but in the discharge current and welding two kinds of factors, the corrosion performance of galvanized steel is not ideal, a lot of excavation findings also confirmed that .
Mechanical connection Chemical exothermic welding Figure 1 Exothermic welding and mechanical coupling of chemical comparison Application in engineering examples 110Kv jinshan substation is outdoor substation setting switchgears building and 110Kv outdoor switchgears, set type I road within station.
Online since: November 2013
Authors: Zhi Ming Zhu, Kai Rui Zhou, Chun Hong Tan, Zu Yin Zou
Select the characters of landslide, geological structure, elevation, slope, slope, earthquake, rainfall and other factors as analysis variables.
Combine GIS with fuzzy mathematical evaluation method, develop the landslide stability evaluation plug-in and then divide the risk regionalization of study area, in order to avoid occurrence of geological hazards in the area, reduce casualties and property losses.
It refers to the slope in a state of flux for a variety of natural or man-made factors destroyed the original mechanical balance, under the action of gravity or other, along with a weak overall, slow and intermittent forward even suddenly moves down the bad geological phenomenon of [2], in a certain terrain and geological conditions.
Landslide has the environmental conditions, and induced condition, the slope characteristics, formation lithology, geological structure, topography, earthquake and rainfall, and other factors, in-depth study systematically dominant factors and inducing factors and the occurrence and spatial distribution of landslides, the relationship between the work of protecting against and mitigating earthquake disasters have important application value.
In recent years, GIS has been widely applied in the study of slope disaster, slope information management, the main associated with dynamic and static environment factors analysis of landslide, landslide disaster spatial prediction system and slope disaster warning system four aspects [4].
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