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Online since: January 2010
Authors: Shi Zhong Liu, Jia Rong Li, H.P. Jin
Introduction Nickel-based single crystal superalloys are predominately used as materials for turbine blades in aero-engines because of their excellent mechanical properties at elevated temperatures.
The radiation is calculated using a view factor model: continuously updating the radiation view factors between the mold cluster and the furnace wall during the withdrawal.
The thermal properties data and boundary conditions for DD6 were used in this study as base values.
The influence of changing thermophysical properties and boundary conditions on the temperature of the node is illustrated.
Solidification parameters of single crystal casting can be simulated accurately, but it is a complicated combination with all the factors.
Online since: April 2007
Authors: Bin Zhu, Xiang Rong Liu, Jun Cai Sun
Introduction Ceria-based electrolytes based on the ion-doping technique have been investigated extensively as regards its fundamental properties and applications for intermediate temperature solid oxide fuel cells (ITSOFCs) during past decades [1-4].
However, due to its inherent shortcomings and limits, such as the reduction of Ce 4+ to Ce 3+ associated with the fuel cell (FC) anodic condition resulting in partial electronic conduction and poor mechanical properties, and insufficient ion conductivity at low temperatures, e.g., 5x10 -3 Scm-1 for the samarium doped ceria (the best ion conducting ceria) at 600°C [5], current ceria-based electrolytes are meeting critical technical challenges for applications.
Therefore, for the La2O3-CeO2 binary system the La 3+ doping effect would not be the major factor to affect the system electrical properties.
Due to this amount of the carbonate used the CeO2-La2O3-25 NLC composites were able to maintain a good solid state, and had actually better mechanical properties than the pure CeO2-La2O3 itself.
Online since: February 2018
Authors: Ran Wei, Fu Shan Li, Chen Chen, Hang Zhang, Xiao Dong Jia
Introduction Bulk metallic glasses (BMGs) possess many intriguing properties for prospective applications and attract extensive attentions [1].
This would affect the distribution of shear bands ahead of notch tip, and because there are few literatures about the influence of nano-crystallization and phase-separation on Poisson’s ratio of BMGs, the effect of these two characters on U(xi) would not be discussed in this work.
Base on the previous study [8], phase separation is very effective in increasing the nucleation number of shear bands due to the heterogeneous caused by two phases with different mechanical properties.
Therefore, the combination of two factors could significantly lift the toughness of a BMG alloy on the basis of Eq. (4), and this positive effect is confirmed by the result of this study.
Mechanical properties of bulk metallic glasses, Prog.
Online since: October 2016
Authors: Kali Pada Maity, Munmun Bhaumik
The required properties of AISI 304 and WC are mentioned in Table 1.
Table 1 Properties of Workpiece and electrode material Material Properties AISI 304 Tungsten Carbide (WC) Density (g/cm3) 8.00 15.63 Melting temperature (0C) 1450 2870 The control parameters and their levels are chosen for this investigation is tabularized in Table 2.
Table 2 Level values of input factors Sl.
Factors Levels 1 2 3 Machining parameter 1 Ip (A) 2 6 8 2 Ton (µs) 50 100 150 3 Vg (V) 45 55 65 4 ґ (%) 55 60 65 Fixed parameter 5 Flushing Pressure (kg/ cm2) 0.2 6.
For this study, the distinguishing factor considered is 0.5.
Online since: March 2013
Authors: Xuan Zhou, Zheng Lu, Wei Min Guo
Planner’s work became to collect relevant information such as population, employment, income, transportation, land use, even personal preference and other socio-economic factors to establish mathematical model for calculating results.
So, people realized that due to each person or group could not have enough knowledge and power to solve complex urban problems and all kinds of economic, social and political factors which are interrelated winding.
Planners seem able to handle any problems including political, economic, social, design, mechanical engineering and transportation, etc.
Second, the parties can survey the current space form and objective analysis results including traffic situation, land use, demography, income level, theft and other socio-economic factors, and people can know whether or not there are close relations between space form and these factors by qualitative and quantitative comparisons.
And the theory and method of space syntax provides a rational and neutral communication way, and helps parties to discuss space form and related socio- economic factors such as traffic, land properties, population structure, easy crime spot, exhaust pollution etc, further prompting parties discuss space form in urban vigor, safety and sustainable development.
Online since: March 2011
Authors: Piotr Lacki, Kwiryn Wojsyk, Konrad Adamus, Marcin Zawadzki
These properties allow it to be successfully applied in aerospace industry for elements that work at elevated temperatures.
Few key properties of electron allow it to be successfully applied in welding applications [5]: · electrons have electric charge (-1,6 ·10-19 C) and can be accelerated using electric field, their kinetic energy will be converted to heat upon collision with welded material, · electrons exist at external atom shells and can be easily detached.
The error might be caused by 2 factors: · different material properties such as thermal conductivity and heat capacity, · training data contained information only about impact of single parameter change on weld pool geometry, there was no information about impact of more than 1 parameter change on pool geometry, for instance, there was no information about impact of focus change on current-depth dependency.
Thermo-mechanical coupled, TMC, analysis was used to determine the magnitude of thermal stresses.
The error introduced by the model is expected to follow from the fact that 18-8 steel and Inconel 706 have different properties and EB calibration process didn't take into account dependencies caused by changing more than 2 parameters simultaneously.
Online since: October 2022
Authors: Oleg A. Kudryavtsev, Anastasia V. Ignatova, Nikita A. Olivenko
Tables 1 and 2 contain data on the elastic and strength properties of the composite determined during quasi-static tests of the standard specimens.
Composite elastic properties E1 [GPa] E2 [GPa] E3 [GPa] G12 [GPa] G13 [GPa] G23 [GPa] v12 v13 v23 25.9 20.3 9.7 4.5 4.2 3.7 0.15 0.19* 0.18* * - estimated values Table 2.
Composite strength properties F1t [MPa] F2t [MPa] τ12 [MPa] 550 370 80 Experiments Low-velocity impact tests.
Thus, the hypothesis mentioned in [12] about the possibility of taking into account the strain rate during high-velocity impact by introducing a correction factor for the material strength was confirmed.
The MAT_054/MAT_ENHANCED_COMPOSITE_DAMAGE orthotropic material model was used in calculations to describe the mechanical behaviour of the composite.
Online since: August 2023
Authors: Artem Ruban, Viktoriya Pasternak, Viktoriia Shvedun, Julia Veretennikova
The main focus was on modelling various element shapes, and the authors also considered the influence of individual factors on the particle cross-section.
And also, to predict the main properties of forming the structure of materials at a significantly new and qualitative level.
Ruban, Investigation of the properties of powder materials using computer modeling, Materials Science Forum 1038 (2021) 33-39
Research into surface properties of disperse fillers based on plant raw materials.
Kovalenko, Determination of the influence of deflections in the thickness of a composite material on its physical and mechanical properties with a local damage to its wholeness, Eastern-European Journal of Enterprise Technologies 4, 1(100) (2019) 6-13
Online since: July 2015
Authors: Edvins Dauksta, Arturs Medvid', Vasyl Klad’ko, Boris Danilchenko, Anna Rarenko, Sergiy Budzulyak, Ilariy Rarenko, Dmytro Korbutyak, Leonid Kosyachenko, Petro Fochuk, Volodymyr Koshkin, Valeriy Sklyarchuk, Zinaida Zakharuk, Sergey Dremlyuzhenko, Yevgeniy Nikonyuk, Lubomyr Demchyna, Nadiya Vakhnyak
The electroconductivity, photoconductivity, mechanical, chemical properties of the crystals do not deteriorate after their irradiation by γ-photons with energies up to 1 MeV and doses up to 1018 cm-2, by electrons with energies up to 300 MeV and doses up to 1019 cm-2 and by mixed reactor irradiation (filtered slow neutrons) with doses up to 1019 cm-2 [1,2].
The energy Et also affects the rectification coefficient of the diode.
Competition of these factors leads to the existence of an optimal value for Nd - Na, at which the responsivity is maximal.
Their structural, electrical and optical properties were studied.
Their photoelectric and transport properties are investigated.
Online since: October 2010
Authors: J.F. Fernandez, J.S. Moya, Antônio Carlos da Silva, Sonia Regina Homem de Mello-Castanho, J.J. Reinosa
Fernandes et al6, pointed out the final properties of chromium content porcelain tiles fired at the optimal sintering temperatures are superior (lower water absorption, higher bending strength) comparing to the similar chromium free compositions.
Table II – Mechanical properties of stoneware porcelains Composition σf (MPa) Hv (GPa) G00 55±7 6,21 ± 0,17 G20 48±3 5,61 ± 0,64 P00 49±5 4,94 ± 0,27 P20 37±2 5,79 ± 0,24 The chemical resistance and stability under environmental conditions were studied by 7 days PCT-B test (ASTM 1285 –02) 11.
The produced tiles show similar porosity and mechanical properties compare with the commercial samples according with the required standards for these materials.
A., Extrusion and property characterization of waste-based ceramic formulations, J.
Carbajal L., Rubio-Marcos F., Bengochea M.A., Fernandez J.F., Properties related phase evolution in porcelain ceramics.
Showing 23061 to 23070 of 26166 items