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Online since: September 2014
Authors: Jian Wu Yu, Li Hua He, Xiang Zhong Liu, Yao Wu, Jian Gang Tu, Tao Xu, Zhong Jian Zhang
Introduction Extensive applications of cemented carbides are due to their excellent mechanical properties, such as high hardness, high resistance, and good strength [1].
Grinding is the main method to machine cemented carbides at present, and the grinding characteristics of ultrafine-grained cemented carbides maybe change to some extent with the increasing of hardness, strength and other mechanical properties.
The material removal mechanism of ultrafine-grained cemented carbides in grinding process was studied [6], and it related to material properties.
Liu Lianbin and Zhang Bi et. al. [7] studied the material removal mechanism by grinding of nanostructured ceramic coatings; Rudy Irwan and H Q Sun et al. [8-9] studied the mechanical and removal characteristics of cemented carbides with nanoidentation and nanscratch, load and feedrate were regarded as the main factors to affect material removal rate.
Their mechanical properties and chemical compositions are listed in table 1.
Online since: June 2011
Authors: Wei Jun Liu, Kai Zhang, Ri Sheng Long
Configuration and Adjustment of Substrate Preheating Device Kai Zhang1,a, Risheng Long2,b and Weijun Liu3,c 1School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China 2Research Department, SANY Heavy Industry Co.
There are many factors affecting the quality, precision, microstructure and performance of LMDS-deposited parts.
These short duration thermal cycles can induce solid-state transformations in the previously deposited layers, and lead to progressive modification of their microstructure and properties.
As a result, the type and extent of the solid-state phase transformations induced by the thermal field in the part may vary from point to point, thus leading to the complex distribution of microstructure and properties observed experimentally [5].
Among the influencing factors of thermal history, substrate preheating is an effective one to resolve the above-mentioned issues.
Online since: September 2003
Authors: Chao Yuan Wang, Xin Wei, H.W. Du, Y.L. Fang
The results show that the properties of composition in asphalt concrete have significant influence on instantaneous cutting forces.
The factors affecting cutting forces of concrete were analyzed.
(cm) -2.5 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 Fz (N) 0 20 40 60 80 100 120 Material: asphalt concrete Singlediamond tool Dry cutting ap=30mm vc=0.05m/s (0.01 s) µ Fig.2 Relationship between cutting force signals and composition phases of asphalt concrete in cutting process Fig.3 Relationship between cutting forces and depth of cut in asphalt concrete cutting process The Factors Affecting the Cutting Forces in Concrete Cutting Process. (1) Depth of cut ap.
The mechanical properties of the composition influence the cutting mechanism and consequently the cutting forces.
The instantaneous cutting forces in asphalt concrete cutting process are influenced significantly by the properties of concrete composition.
Online since: November 2016
Authors: Bianca Viana de Sousa, André Miranda da Silva, Carlos Eduardo Pereira, Josiele Souza Batista Santos
It was found that the particles had irregular shapes and sizes, and the presence of voids affecting the strength of the material.
Geopolymer’s mechanic properties are complex and affected by a large variety of synthesis parameters, including material properties, feedstock geopolymerization degree, chemical composition (for example, Si/Al ratio) of the geopolymer binder, the relative fractions and the non-active loads, inactive fillers characteristics (particle size, form and intensity, for example), porosity and density, impurity elements (Ca, Mg, Fe, for example), and parallel associated reactions [3].
The results show a not significative effect to the 95% probability level to the main factors (bauxite mud, calcined RHA and metakaolin), as the P value was higher than 0,05.
The micrographies of the geopolymer materials show particles with irregular sizes and shapes, as well as presence of empty spaces, due to water evaporation in the heal time, affecting the flexion resistance of the material.
Davidovits, Properties of geopolymer cements.
Online since: August 2019
Authors: Yuryi Zakorchemny, Oleksiy Kushnir, Oksana Korobko, Valeriy M. Vyrovoy
Integral damage of material determines the level of mechanical and deformative properties of products.
The role of deformations in structural organization and formation of product properties.
Internal and external factors influence material at the same time.
At the same time, the limiting internal influences for surrounding systems (subsystems) pass from a rank of internal factors of influence into a rank of external factors with the relevant mechanism of realization.
Structure, Self-organization, Properties, TES, Odessa, 2010
Online since: June 2008
Authors: János Dobránszky
The constituent phases - fine mixture of ferrite and cementite and a small amount of retained austenite - considerably affect the mechanical properties, especially the resistance to high cycle fatigue.
So that new XRD analyses were also done on the two other steel strips, of which mechanical properties differed the most according to the observations of the producer of the bandsaw blades.
Conclusions Examining the great amount of tempered eutectoid steel strips it was proved that important differences can be measured by thermoelectric power measurement between steel strips with nearly the same mechanical properties and chemical composition.
The TEP measurement sensitively shows the different conditions of the microstructural properties.
Among the microstructural properties the role of two important factors turned out: firstly - and more important - the dispersion of the distribution of cementite in ferrite-cementite mixture, secondly the amount and distribution of retained austenite.
Online since: April 2013
Authors: Jussi A. Karjalainen, Kari Mäntyjärvi, Anna Maija Arola
The aim of this study was to investigate the factors affecting the bendability of ultra-high strength steel using optical strain measurements and FEM-modeling of the bending process.
(1) The Rmin can be determined analytically by using the equations that account the effect of different properties of the material such as ductility, work hardening and anisotropy [2].
The bending limit is affected not only by material properties but also tool geometry, the bending procedure, sheet thickness and the surface or edge condition of the sheet.
The mechanical properties of this material were determined with tensile testing.
Dieter: Mechanical Metallurgy.
Online since: October 2006
Authors: Tae Whan Hong
Especially, the hydrogenation properties were depended on properties of globules and liquid fraction.
Introduction Magnesium and magnesium alloys were known as the materials having a good specific strength structurally and variable smart properties [1].
According to the PCI results on partially remelted Mg-10Al alloys, partially remelted microstructure and crushing effect on specimen affected the hydrogenation properties affirmatively.
Especially, hydrogenation properties were affected by following factors: 1) liquid fraction with liquid droplets, 2) properties of globules.
Thus, partially remelted Mg-10Al/Mg-6Mn Mg alloy were found to have excellent hydrogenation properties compared with conventional casting/polycrystalline ones.
Online since: May 2018
Authors: Hai Yun Jin, Nai Kui Gao, Teng Yue Ren, Ze Hua Pan, Jia Wei Ma
Electric and thermal properties of the composites were tested at room temperature to investigate the influence of Al2O3 morphology on epoxy resin composites.
Epoxy resin exhibits good electrical and mechanical properties, as well as easy processability.
But there are few reports about the influence of the morphology of inorganic filler on properties of epoxy resin composites.
Wu, Interfacial modification of boron nitride nanoplatelets for epoxy composites with improved thermal properties, Polymer. 53 (2012) 471–480
Xie, Thermal and electrical properties of epoxy composites at high alumina loadings and various temperatures, Iran.
Online since: October 2012
Authors: Chao Cheng Chang, Li Yi Lin
These micro parts may be produced by Micro electro-mechanical system (MEMS) technology.
Alternatively, metal forming is one of potential technologies especially suitable for the mass production of metallic parts because of the advantages of high production rate, minimized material loss, excellent mechanical properties of the final product and close tolerances.
The factors used to investigate the size effects include the size of grain and the size of feature.
The above literature reviews show that grain size does affect material flow behavior.
The above results show that grain size affects the depth of the deformed dome.
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