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Online since: September 2006
Authors: Walter Reimers, Bjoern Reetz
They indicate the presence of strong microstresses [1] which can seriously affect properties like stress-corrosion cracking and fatigue resistance.
Therefore, the d-values obtained from the stress values experimentally determined were weighted a factor hklE 1 .
The dislocation density was assumed to enhance the elastic strains, whereas mechanical twinning should weaken the elastic strains. 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.0 0.2 0.4 0.6 0.8 3.693 3.694 3.695 3.696 3.697 Experiment Lattice parameter a [A] sin 2ψψψψ Simulation Lattice parameter, model [a.u.] 0.7 0.8 0.9 1.0 1.1 1.2 1.3 0.0 0.2 0.4 0.6 0.8 3.6940 3.6944 3.6948 3.6952 Experimente Lattice parameter a [A] sin 2ψψψψ Simulation Lattice parameter a, model [a.u.]
Conclusions Texture, elastic anisotropy, the presence of differently deformed crystallite groups and mechanical twinning were considered to explain non-linearties of sin 2ψ-plots at different deformation stages.
Online since: July 2015
Authors: Dan Xia Li, Wan Xia Huang, Lin Wei Song, Qi Wu Shi
Extraordinary properties make VO2 very attractive for versatile potential applications, but the insulator-metal phase transition may be very easily affected[15-17].
In particular, stability is a critically important factor.
Results proved that the MIT switching properties of the VO2 thin film were even mainly not affected after more than 108 cycles, applying a voltage of 50V.
Electronic and optical properties of monoclinic and rutile vanadium dioxide.
Stability of Electrical Properties of Vanadium Dioxide Based Ceramics.
Online since: October 2008
Authors: Václav Sklenička, Milan Svoboda, Ivan Saxl, Květa Kuchařová
Introduction Advanced tempered martensitic 9-12%Cr steels [1-9] are favoured for high temperature applications, such as boiler and turbine components in fossil fired power plants which operate in the creep range at temperatures up to 650°C, due to their excellent combination of mechanical and oxidation-resistant properties.
Perhaps the most important factor governing the creep properties of these steels is the long-term stability of their microstructure.
Simultaneously with the subgrain coarsening a change in the subgrain shape factor occurs indicating that the subgrains try to approach the equiaxed shape.
It was found that W precipitates as intermetallic Laves phase during creep exposure, but the loss of tungsten from solid solution does not seem to affect long-term creep stability.
No significant deterioration of the creep properties was found for the steels P91, P92 and E911 under temperature-cycled creep loading in power-law creep.
Online since: October 2014
Authors: Motlalepula Nete, Walter Purcell, Johann T. Nel
Abstract: The process beneficiation of minerals such as the tantalum and niobium ores may vary significantly and the final sequence of steps normally depends on the physiochemical properties.
These properties are often utilised in designing a processing route.
The successful beneficiation of tantalum and niobium ores may vary significantly and its success normally depends on the physiochemical properties (of the ore) such as the presence of radioactive materials, its response to a magnetic field (removal of the magnetic particles), the Ta and Nb content and finally the nature of the ore.
The minerals’ characterization as studied by Nete et al [4], revealed only the physical properties of the samples.
A recent study by Nete et al [12] has investigated the influence of other experimental factors such as temperature and sulphuric acid concentration.
Online since: June 2013
Authors: Kenichi Manabe, Sergei Alexandrov, Tsuyoshi Furushima, Hitomi Tsunezaki, Tomoko Nakayama
Prediction of Surface Roughening and Necking Behavior for Metal Foils by Inhomogeneous FE Material Modeling Tsuyoshi Furushima1, a, Hitomi Tsunezaki1, Tomoko Nakayama1, Ken-ichi Manabe1 and Sergei Alexandrov2 1 Department of Mechanical Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo, 192-0397 Japan 2 Institute for Problems in Mechanics, Russian Academy of Sciences, 101-1 Prospect Vernadskogo, 119526 Moscow, Russian Federation afurushima-tsuyoshi@tmu.ac.jp Keywords: Surface roughening, Necking, Metal foil, Material inhomogeneity.
Thus, the free surface roughening of metal foils may affect not only local problem such as accuracy of products and frictional condition but also global deformation behavior such as necking behavior which is onset of fracture.
Table 1 shows the material properties of pure copper foil C1020-O obtained from uni-axial tensile test and microstructure observation.
Table 1 Material properties of metal foil C1020-O.
Online since: March 2013
Authors: You Wang, Xiao Guang Sun, Liang Wang
This is primarily due to the fact that ceramic and metal have very different properties.
The thermally grown oxide (TGO) which is mostly generated between the metallic layer and ceramic layer is often one of the most important factors inducing the failure of the coating.
Many literatures have reported the thermal physical properties of zirconate-based bulk ceramic materials, very little investigation focused on the zirconate-based TBCs.
The aim of this study will try to make clear the difference and influencing factors of the high temperature oxidation behaviour of the three as-sprayed TBCs.
(2) Thermally grown oxide (TGO) is an important factor which can affect the failure mode of the TBC at high temperature.
Online since: May 2011
Authors: Min Zhou, Zhong Fu Wang, Si Wei Wang
Two different mechanical paramter of soil body is adopted respectively in the simulation for better understanding of the mechanism of action of the squeezed branch pile, mechanical parameter of the pile body and soil body are shown in Table.1.
Tab.1 Material properties material Parameter index Parameter Pile body capacity(KN/m3) 25 Elastic modulus(Mpa) 20000 Poisson ratio 0.3 Soil body capacity(KN/m3) 20 Elastic model (Mpa) 5(10) Poisson ratio 0.45 Cohesive strength(KN/m2) 20(50) Internal friction angle(degree) 0 Result analysis Axial compression.
As calculating the settlement of the pile by layer wise summation method, the main factor is compressive compression, so from this aspect the usage of squeezed branch can reduce the settlement of the pile effectively.
The larger of the loads applied at the tip of the pile, the larger the range affected by vertical displacement.
Online since: April 2014
Authors: Mohd Zulkefli Selamat, W.M.F.W. Mohamad, B. Bundjali, M. Musa
Musa1, d 1Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia. 2Department of Chemistry, Bandung Institute of Technology, Jl.
Thus, the microstructure modifications, known as surface defects of the alloy caused by cold rolling process may affect the corrosion behavior of the steel.
This was attributed that in nearly neutral solution (pH = 7.31), the formation of the stable passive film (with high Cr2O3 content) plays a predominant factor which contribute to decrease metal dissolution.
Cold Deformation Effect on the Microstructures and Mechanical Properties of AISI 301LN and 316L Stainless Steels.
Online since: January 2021
Authors: Angelo Fernando Padilha, Flavio Beneduce Neto, Leandro Gomes de Carvalho, Ronald Lesley Plaut
They are round-like precipitates, with an average diameter in the range of 3 to 10 µm, light-gray, with a relatively homogeneous distribution, but frequently found in groups of elongated particles, suggesting that the larger particles have been fragmented during mechanical working.
They look like round particles, partially faceted, with an average diameter in the range of 2 to 5 µm, red-gray colored, with a non-homogenous distribution, in groups of elongated particles, and like titanium carbide, suggesting fragmentation of larger particles during mechanical working.
The results of this work are in agreement with the work by Da Casa and Nileshwar [7], that verified that solution annealing heat treatments during 1 to 6 h performed on an AISI 321 steel between 1200 and 1350 °C did not affect the amount of the Y phase.
Mater., Thermal creep properties of Ti-stabilized DIN 1.4970 (15-15Ti) austenitic stainless steel pressurized cladding tubes, 493 (2017) 154-167
A, The temperature factor parameters of some transition metal carbides and nitrides by single crystal X-ray and neutron diffraction, 32 (1978) 89-90
Online since: September 2005
Authors: Zbigniew Zembaty, Marcin Kowalski
After each phase of the damaging, strong kinematic motions, a phase of low intensity, diagnostic excitations was carried out to detect changes of modal properties.
This was carried out by applying the same seismic signal multiplied by an increasing factor.
Each phase of strong excitations was followed by various low level, diagnostic excitations (as for the intact frame) to investigate the changes done to modal properties of the frame.
The effects of these changes on dynamic properties of reinforced concrete structures are subject of recent research (e.g. [8, 9]) aimed at developing methods for non-destructive damage evaluation for these types of structures.
Shevitz: Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: a literature review (Los Alamos National Laboratory Report LA-13070- MS, 1996)
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