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Online since: November 2022
Authors: Christian Bay, Alexander Mahr, Andreas Hofmann, Christian Wienert, Frank Döpper
Dissimilar means that the metallurgical and mechanical-technological as well as chemical and physical properties of the materials differ [5,6].
The resulting temperature-gradient mechanism can lead to thermal-induced residual stresses, which can negatively affect the mechanical properties and lead to distortion [16,22].
Table 3 shows microscopy images and the surface properties of the build plates made of Titanium Grade 2 and AlMgSi0.5.
In each case, this decrease is due to favorable spatter and oxide formation, resulting in a decrease in mechanical properties due to adhesion and embrittlement.
Mumtaz: Effect of scanning strategies on residual stress and mechanical properties of Selective Laser Melted Ti6Al4V, Materials Science and Engineering: A 712 (2018) 175–187. https://doi.org/10.1016/j.msea.2017.11.103
The resulting temperature-gradient mechanism can lead to thermal-induced residual stresses, which can negatively affect the mechanical properties and lead to distortion [16,22].
Table 3 shows microscopy images and the surface properties of the build plates made of Titanium Grade 2 and AlMgSi0.5.
In each case, this decrease is due to favorable spatter and oxide formation, resulting in a decrease in mechanical properties due to adhesion and embrittlement.
Mumtaz: Effect of scanning strategies on residual stress and mechanical properties of Selective Laser Melted Ti6Al4V, Materials Science and Engineering: A 712 (2018) 175–187. https://doi.org/10.1016/j.msea.2017.11.103
Online since: January 2013
Authors: Bin Yu, Zhi Dong Liu, Qing Chen Jin, Wei Chen
The property of material is shown in table.2.
Fiber Reinforced Plastic Structure Design Composite structure was fabricated by filament wound[±α,90º]helical/hoop construction, fiber/epoxy laminates using T800 graphite fiber and Kevlar 49 fiber hybrids laminates, hybrid fiber laminates have significantly better impact properties than laminates reinforced with only carbon fiber types, with higher toughness Kevlar 49 fiber hybrids, carbon fiber laminates brittle problem was solved[2].
The protective cover protect L376-COPV under the worst credible mechanical impact, it is fabricated by S2 glass fiber filament, the thickness of protective cover is 1mm.
The closed die forming operation was used to remove liner weld bead convexity, heat treatment operation was used to recover materials properties in the welds and to alleviate residual stresses in the weld and heat affected zone.
Performance factor for this COPV is 23Km.
Fiber Reinforced Plastic Structure Design Composite structure was fabricated by filament wound[±α,90º]helical/hoop construction, fiber/epoxy laminates using T800 graphite fiber and Kevlar 49 fiber hybrids laminates, hybrid fiber laminates have significantly better impact properties than laminates reinforced with only carbon fiber types, with higher toughness Kevlar 49 fiber hybrids, carbon fiber laminates brittle problem was solved[2].
The protective cover protect L376-COPV under the worst credible mechanical impact, it is fabricated by S2 glass fiber filament, the thickness of protective cover is 1mm.
The closed die forming operation was used to remove liner weld bead convexity, heat treatment operation was used to recover materials properties in the welds and to alleviate residual stresses in the weld and heat affected zone.
Performance factor for this COPV is 23Km.
Online since: April 2010
Authors: Y.L. Hsu, C.H. Lee, S.M. Chiu, Y.C. Sung, K.Y. Yang, C.W. Chu
Anti-sticking Properties of PVD CrWNx, CrOx and ZrOx Coatings
on Medical Electrode Application
Y.L.
Some chromium nitride and metal oxide coatings with anti-wear and hydrophobic properties [1-4] had been developed by physical vapor deposition (PVD) process.
The anti-sticking properties of coated electrodes were preformed on fresh pork liver by electrosurgical cutting mode.
The results of surface energy shows that the polar component of surface energy was the predominant factor in determining the hydrophobic property of the surfaces.
Mechanical properties The working tip of the electrosurgical electrode is subject to high temperature during use.
Some chromium nitride and metal oxide coatings with anti-wear and hydrophobic properties [1-4] had been developed by physical vapor deposition (PVD) process.
The anti-sticking properties of coated electrodes were preformed on fresh pork liver by electrosurgical cutting mode.
The results of surface energy shows that the polar component of surface energy was the predominant factor in determining the hydrophobic property of the surfaces.
Mechanical properties The working tip of the electrosurgical electrode is subject to high temperature during use.
Online since: August 2019
Authors: Liércio André Isoldi, Elizaldo Domingues dos Santos, Antônio José da Silva Neto, Gill Velleda Gonzales, Luiz Alberto Oliveira Rocha
Here parameters as mutation operator (M), crossover constant (CR), differential amplification factor (F), Population Size (PS) and Generations number (G) are evaluated.
Results indicated that the crossover constant (CR) and amplification factor (F) are important parameters for suitable prediction of the effect of degrees of freedom over thermal performance.
In this study, it was showed that one configuration parameter of the method can strongly affect the influence of geometry over thermal performance of the intruded cavity.
Some advantages of this method are the few number of control parameters, adaptability to parallel processes and good convergence properties [17].
In the present work, four different version of DE algorithm was executed with different parameters of mutation (MR), crossover (CR) and amplification factor (F).
Results indicated that the crossover constant (CR) and amplification factor (F) are important parameters for suitable prediction of the effect of degrees of freedom over thermal performance.
In this study, it was showed that one configuration parameter of the method can strongly affect the influence of geometry over thermal performance of the intruded cavity.
Some advantages of this method are the few number of control parameters, adaptability to parallel processes and good convergence properties [17].
In the present work, four different version of DE algorithm was executed with different parameters of mutation (MR), crossover (CR) and amplification factor (F).
Online since: September 2012
Authors: Fang Li, Juan Hu Deng, Jing Wei, Hao Miao Zhou
The microwave devices made of ME materials can conquer the disadvantages of those made of two traditional materials, i.e. the tuning speed of ferrite microwave devices is relatively slow and ferroelectric microwave devices cause large microwave loss and low quality factor.
They have developed a tunable microwave resonator with a 100MHz maximum resonant frequency shift in electric field of 8kV/cm, a tunable microwave filter with a 420MHz maximum resonant frequency shift in electrical field of 30kV/cm, the ME phase shifter, attenuator and delay lines, etc. [2-4] Considering such elements as magnetic anisotropy, stress anisotropy and demagnetized field etc., and the fact that the electric field induces mechanical stress on ferroelectric layers, which will further induce FMR frequency shift on ferrite layers, Bichurin et al. have carried out theoretical research in the electric field tuning FMR frequency shift [5-6].
However, in the process of designing microwave devices for engineering applications, electric field will deform the materials, and the deformation will change the magnetic properties of ferromagnetic materials, leading to the shift of FMR frequency, which will seriously affect the function of microwave devices.
Meanwhile, the electric field tuning magnetic property and the geometric parameters of ferrite are very important to ME microwave devices.
In this paper, we considered the change of the magnetic properties caused by electric field equals to that by magnetic field.
They have developed a tunable microwave resonator with a 100MHz maximum resonant frequency shift in electric field of 8kV/cm, a tunable microwave filter with a 420MHz maximum resonant frequency shift in electrical field of 30kV/cm, the ME phase shifter, attenuator and delay lines, etc. [2-4] Considering such elements as magnetic anisotropy, stress anisotropy and demagnetized field etc., and the fact that the electric field induces mechanical stress on ferroelectric layers, which will further induce FMR frequency shift on ferrite layers, Bichurin et al. have carried out theoretical research in the electric field tuning FMR frequency shift [5-6].
However, in the process of designing microwave devices for engineering applications, electric field will deform the materials, and the deformation will change the magnetic properties of ferromagnetic materials, leading to the shift of FMR frequency, which will seriously affect the function of microwave devices.
Meanwhile, the electric field tuning magnetic property and the geometric parameters of ferrite are very important to ME microwave devices.
In this paper, we considered the change of the magnetic properties caused by electric field equals to that by magnetic field.
Online since: December 2013
Authors: Shinichi Furusawa, Takao Tsurui, Kouhei Shimizu
Introduction
Lithium-ion-conducting inorganic oxides are expected to find important applications in lithium-ion devices such as all-solid-state and thin-film batteries because of their high chemical stability and mechanical strength.
However, the development of such ionic devices requires clarity on the ionic conduction mechanism in solids and nanoscale control over the device structure and physical properties.
Therefore, we believe that studying the physical properties of non-rare- or less-rare-earth materials is also important.
(1) Ionic conduction in LSO thin-films is affected by the hetero-interface. [12-15] (2) The temperature dependence of ionic conductivity of as-prepared LSO thin-films on sapphire substrate in the initial heating process shows irreversible behaviour.[16] We conclude that the irreversible conductivity behaviour may be caused by the generation of nanocrystals in the LSO thin-film.
Here, N denotes the number density of the carrier, Ze denotes the charge of the carrier, a denotes the hopping distance, Γ0 indicates the attempt frequency, Δ denotes the activation energy, and f denotes a correlation factor whose value is approximately 1.
However, the development of such ionic devices requires clarity on the ionic conduction mechanism in solids and nanoscale control over the device structure and physical properties.
Therefore, we believe that studying the physical properties of non-rare- or less-rare-earth materials is also important.
(1) Ionic conduction in LSO thin-films is affected by the hetero-interface. [12-15] (2) The temperature dependence of ionic conductivity of as-prepared LSO thin-films on sapphire substrate in the initial heating process shows irreversible behaviour.[16] We conclude that the irreversible conductivity behaviour may be caused by the generation of nanocrystals in the LSO thin-film.
Here, N denotes the number density of the carrier, Ze denotes the charge of the carrier, a denotes the hopping distance, Γ0 indicates the attempt frequency, Δ denotes the activation energy, and f denotes a correlation factor whose value is approximately 1.
Online since: July 2013
Authors: Janusz Majta, Dominik Dziedzic, Krzysztof Muszka
Multiscale modeling combining Digital Material Representation and Crystal Plasticity enables to gain a better fundamental understanding of mechanical response and microstructure evolution of precipitation strengthened austenite and ferrite of three microalloyed steel grades.
Introduction Thermomechanically processed microalloyed steels with an excellent properties such as high strength, good toughness and weldability, lower ductile to brittle transition temperature, good resistance to hydrogen-induced cracking etc., have been a great commercial success as the structural materials for many years [1].
Although, it was reported in the literature that strain rate has an effect on SIDT [3] (at higher strain rates SIDT ferrite nucleates not only on prior austenite grain boundaries but also in the austenite grain interiors) in the case of present work, the critical factor for dynamic transformation is strain – i.e. energy accumulated in the material – when sufficient level of deformation isn’t obtained, transformation will proceed during cooling after deformation and will be “static”.
Effect of strain-induced precipitation and solid solution strengthening affect the state of austenite and provide possible nucleation sites
Introduction Thermomechanically processed microalloyed steels with an excellent properties such as high strength, good toughness and weldability, lower ductile to brittle transition temperature, good resistance to hydrogen-induced cracking etc., have been a great commercial success as the structural materials for many years [1].
Although, it was reported in the literature that strain rate has an effect on SIDT [3] (at higher strain rates SIDT ferrite nucleates not only on prior austenite grain boundaries but also in the austenite grain interiors) in the case of present work, the critical factor for dynamic transformation is strain – i.e. energy accumulated in the material – when sufficient level of deformation isn’t obtained, transformation will proceed during cooling after deformation and will be “static”.
Effect of strain-induced precipitation and solid solution strengthening affect the state of austenite and provide possible nucleation sites
Online since: July 2015
Authors: Philippe Lorong, Shadan Tabibian
This is an important force factor in drilling operations.
The cutting force value is primarily affected by the following cutting conditions: - Cutting speed, vc, feed, f, and depth of cut, ap - Cutting tool geometry (tool orthogonal rake angle) - Properties of work material As it may be expected, the size relationship between the force components varies considerably with the type of machining operation.
We can nevertheless apply correction factors if the conditions are not identical.
The tool will run through a python script that • Creates data layout for ABAQUS by generating .inp file in with the boundary conditions such as iso-statisme condition, clamping pressures, material properties and the corresponding cutting forces for line boring process are defined; • Starts ABAQUS software and runs .inp file on Renault’s calculation server; • Carries out the results post-processing in .dat file generated by ABAQUS software and presents them in an Excel file.
A simple elasto-plastic constitutive law is used in ABAQUS software to compute the mechanical properties of both cylinder blocks.
The cutting force value is primarily affected by the following cutting conditions: - Cutting speed, vc, feed, f, and depth of cut, ap - Cutting tool geometry (tool orthogonal rake angle) - Properties of work material As it may be expected, the size relationship between the force components varies considerably with the type of machining operation.
We can nevertheless apply correction factors if the conditions are not identical.
The tool will run through a python script that • Creates data layout for ABAQUS by generating .inp file in with the boundary conditions such as iso-statisme condition, clamping pressures, material properties and the corresponding cutting forces for line boring process are defined; • Starts ABAQUS software and runs .inp file on Renault’s calculation server; • Carries out the results post-processing in .dat file generated by ABAQUS software and presents them in an Excel file.
A simple elasto-plastic constitutive law is used in ABAQUS software to compute the mechanical properties of both cylinder blocks.
Online since: August 2005
Authors: Kwang Yong Lim, Hee Soo Lee, Won Jun Lee, Youn Seoung Lee, Sa Kyun Rha, Chung Nam Whang
For polymers, ion irradiation changes surface chemical states, electrical, optical, mechanical,
or thermal properties [1-5].
The parameters affecting those phenomena can be classified into target parameters, such as composition, molecular weight, or temperature of polymers, and ion parameters, such as energy, mass, or dose of ion beam.
The compositional ratios of C, N and O at PI surface were estimated from XPS peak areas and the atomic sensitivity factors [13].
The parameters affecting those phenomena can be classified into target parameters, such as composition, molecular weight, or temperature of polymers, and ion parameters, such as energy, mass, or dose of ion beam.
The compositional ratios of C, N and O at PI surface were estimated from XPS peak areas and the atomic sensitivity factors [13].
Online since: December 2010
Authors: Mohd Ambar Yarmo, Wan Zurina Samad, Mohamad Bin Kassim, Aznira Alias, Noraini Hamzah
In addition, the use of three different ruthenium precusors (RuCl3, Ru(acac)3 and Ru3(CO)12) for the preparation of the catalyst and their effect on the properties and catalytic performance of the Ru supported catalysts was investigated.
The catalytic hydrogenolysis reactions were carried out in a 50 ml stainless-steel autoclave, PARR reactor equipped with an electronic temperature controller and a mechanical stirrer.
Solutions of n-butanol and 1,4- butanediol with known amounts of internal standards were used for quantification of various glycerol-derived compounds in the product.The conversion of glycerol, the selectivity of propanediols , ethylene glycerol and other products ( propanol (1,2) , ethanol and methanol) were the factors used to evaluate the catalyst performance.
This result revealed type of precursor not affected on the size of Ru particle.
As shown from the results, performance of supported Ru catalyst on bentonite support mainly affected by the different Ru metal precusor.
The catalytic hydrogenolysis reactions were carried out in a 50 ml stainless-steel autoclave, PARR reactor equipped with an electronic temperature controller and a mechanical stirrer.
Solutions of n-butanol and 1,4- butanediol with known amounts of internal standards were used for quantification of various glycerol-derived compounds in the product.The conversion of glycerol, the selectivity of propanediols , ethylene glycerol and other products ( propanol (1,2) , ethanol and methanol) were the factors used to evaluate the catalyst performance.
This result revealed type of precursor not affected on the size of Ru particle.
As shown from the results, performance of supported Ru catalyst on bentonite support mainly affected by the different Ru metal precusor.