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Online since: May 2014
Authors: Mohd Radzi Mohd Toff, Syarifah Nur Aqida, Mohamed Suffian Reza
The hardness properties of laser modified TBC increased 15% of the as-sprayed sample.
These finding are significant to development of thermal barrier coating design optimization for enhanced surface properties of semi-solid forming die.
Porosity in coatings lead to low hardness properties thus caused degradation, and inefficient thermal insulation and corrosion protection of the TBC system.
While table 2, design of experiment developed for sample 1 and sample 2 to deposit top coat material with 3 factors variation.
Valente, Microstructure, mechanical properties and thermal shock resistance of plasma sprayed nanostructured zirconia coatings, Ceramics International, Volume 37, Issue 7, September 2011, Pages 2711-2717, ISSN 0272-8842
These finding are significant to development of thermal barrier coating design optimization for enhanced surface properties of semi-solid forming die.
Porosity in coatings lead to low hardness properties thus caused degradation, and inefficient thermal insulation and corrosion protection of the TBC system.
While table 2, design of experiment developed for sample 1 and sample 2 to deposit top coat material with 3 factors variation.
Valente, Microstructure, mechanical properties and thermal shock resistance of plasma sprayed nanostructured zirconia coatings, Ceramics International, Volume 37, Issue 7, September 2011, Pages 2711-2717, ISSN 0272-8842
Online since: December 2013
Authors: Chung Hao Hsieh, Jian Long Kuo
Therefore, the factors defined for Response Surface Method is shown in Table 2.
The temperature and pressure are selected as noise factors.
By setting the learning factors and which are larger than 4.0.
Two levels are defined for the control factors.
Therefore, the orthogonal array has two factors and two levels.
The temperature and pressure are selected as noise factors.
By setting the learning factors and which are larger than 4.0.
Two levels are defined for the control factors.
Therefore, the orthogonal array has two factors and two levels.
Online since: May 2015
Authors: Buntara Sthenly Gan, Thanh Huong Trinh, Dinh Kien Nguyen
The material properties are assumed to vary continuously in the axial direction according to a power law.
The FGMs are formed by varying percentage of materials components in the desired direction, and as a result, the specific physical and mechanical properties of the formed material can be obtained.
A Poisson’s ratio υ = 0.3 and a shear correction factor ψ = 5/6 is used in computation.
It is clearly seen from the figure that, the material non-homogeneity has great effect on the deflection factor, regardless of aspect ratio.
As seen from the figures, the dynamic responses of the beam are greatly affected by the distance between the loads and the number of loads as well.
The FGMs are formed by varying percentage of materials components in the desired direction, and as a result, the specific physical and mechanical properties of the formed material can be obtained.
A Poisson’s ratio υ = 0.3 and a shear correction factor ψ = 5/6 is used in computation.
It is clearly seen from the figure that, the material non-homogeneity has great effect on the deflection factor, regardless of aspect ratio.
As seen from the figures, the dynamic responses of the beam are greatly affected by the distance between the loads and the number of loads as well.
Online since: July 2015
Authors: Mohd Shariff Azmi, Kok Keong Lau, Norwahyu Jusoh, Yin Fong Yeong
Therefore, a potential approach to improve the separation properties of membranes by incorporating dispersed solids such as zeolites and carbon molecular sieves into the polymeric matrix is developed.The resultant membrane combines the advantages of polymeric and inorganic materials, including economical capabilities of polymers and high separation properties of inorganic fillers.
Polymeric membranes are robust and proficient to endure mechanical harsh operation.
Physical properties and density difference between inorganic filler and polymer matrix contribute to the formation of heterogeneous phase in the membrane.
Part 1: Improvement of the gas separation properties of polymeric membranes by incorporation of microporous adsorbents, J Membrane Sci, 80 (1993) 189-198
Koros, Factors Controlling Successful Formation of Mixed-Matrix Gas Separation Materials, Ind Eng Chem Res, 39 (2000) 2692-2696
Polymeric membranes are robust and proficient to endure mechanical harsh operation.
Physical properties and density difference between inorganic filler and polymer matrix contribute to the formation of heterogeneous phase in the membrane.
Part 1: Improvement of the gas separation properties of polymeric membranes by incorporation of microporous adsorbents, J Membrane Sci, 80 (1993) 189-198
Koros, Factors Controlling Successful Formation of Mixed-Matrix Gas Separation Materials, Ind Eng Chem Res, 39 (2000) 2692-2696
Online since: December 2014
Authors: António Santos Silva, Said Jalali, Luis Mayor Gonzalez
Main factors affecting the reaction rate are alkalinity, content of reactive minerals, humidity, temperature and the presence of calcium ions.
The ASR reactivity of aggregates is often measured by linear expansion of mortar bars or concrete prisms, but many other material properties, inherent or affected by the reaction, are reported [11-14].
The relevant varying conditions are assumed as the main factors known to affect ASR (all other factors were neglected as they are kept constant or have lesser effects).
It results from the varying size or other unaccounted sub-factors in the nature and properties of the aggregates, shape or size of the specimens.
If results are positive, extend to tests based on different properties.
The ASR reactivity of aggregates is often measured by linear expansion of mortar bars or concrete prisms, but many other material properties, inherent or affected by the reaction, are reported [11-14].
The relevant varying conditions are assumed as the main factors known to affect ASR (all other factors were neglected as they are kept constant or have lesser effects).
It results from the varying size or other unaccounted sub-factors in the nature and properties of the aggregates, shape or size of the specimens.
If results are positive, extend to tests based on different properties.
Online since: March 2008
Authors: Werner Riehemann, Agnieszka Mielczarek, Marcin Marczyk
Future industrial application of high damping Cu - Al - Mn alloys is very probable because many
mechanical problems can be solved by the passive damping of mechanical vibrations.
Easy castability under air [2] and good mechanical properties make Cu - Al - Mn alloys very attractive for industrial applications, too.
Thermal and mechanical stability of shape memory alloys are important factors for technical damping applications.
The direct transformation temperatures are essentially unchanged, or at least much less affected by thermocycling than the reverse ones.
Conclusions The direct transformation temperatures are essentially unchanged, or at least much less affected by thermal cycling than the reverse ones.
Easy castability under air [2] and good mechanical properties make Cu - Al - Mn alloys very attractive for industrial applications, too.
Thermal and mechanical stability of shape memory alloys are important factors for technical damping applications.
The direct transformation temperatures are essentially unchanged, or at least much less affected by thermocycling than the reverse ones.
Conclusions The direct transformation temperatures are essentially unchanged, or at least much less affected by thermal cycling than the reverse ones.
Online since: January 2015
Authors: Alicja Laber, Stanisław Laber
Modification of the lubricants improves tribological properties to varying degrees.
The wear of the friction pair is influenced by abundant factors.
This resulted in improvements in all the indicators of lubricating properties.
The tests on tribological properties of the C45 steel/210 CR12 steel friction pair (Fig. 8) confirmed the influence of the additive added during the use of the lubricant on these properties.
Adsorption and tribochemical reactions that accompany the process of friction affected the mechanical and chemical characteristics and introduced changes in the composition of the surface layer.
The wear of the friction pair is influenced by abundant factors.
This resulted in improvements in all the indicators of lubricating properties.
The tests on tribological properties of the C45 steel/210 CR12 steel friction pair (Fig. 8) confirmed the influence of the additive added during the use of the lubricant on these properties.
Adsorption and tribochemical reactions that accompany the process of friction affected the mechanical and chemical characteristics and introduced changes in the composition of the surface layer.
Online since: December 2012
Authors: Amos Dufka, Jiří Bydžovský
Almost 50 % of the inner surface is affected.
Comparison of the results obtained from different layers of concrete is another from the factors which is in a term of assessment highly-valued.
The physico-mechanical properties of concrete due to the reactions under way during the second stage of carbonatation do not decrease yet.
Decomposition of the cement matrix has been already showed by a drop of strength properties (especially cohesion) in surface layers of concrete.
One of the factors which take a part in massive failure development in this case is quite a high porosity of concrete (proved by high values of surface saturation).
Comparison of the results obtained from different layers of concrete is another from the factors which is in a term of assessment highly-valued.
The physico-mechanical properties of concrete due to the reactions under way during the second stage of carbonatation do not decrease yet.
Decomposition of the cement matrix has been already showed by a drop of strength properties (especially cohesion) in surface layers of concrete.
One of the factors which take a part in massive failure development in this case is quite a high porosity of concrete (proved by high values of surface saturation).
Online since: August 2012
Authors: Tim Sercombe, L.C. Zhang
These are detrimental to the resultant mechanical properties.
In this work, we have explored the effect of laser point distance on density and mechanical properties of a low-modulus titanium alloy.
The as-produced samples had comparable mechanical properties to those prepared by conventional processing routes.
For a given material, the laser energy density, E, is a key factor that affects the quality of parts fabricated by selective laser melting.
Levy, Influence of the particle size distribution on surface quality and mechanical properties in AM steel parts, Rapid Prototyping J. 17 (2011) 195-202
In this work, we have explored the effect of laser point distance on density and mechanical properties of a low-modulus titanium alloy.
The as-produced samples had comparable mechanical properties to those prepared by conventional processing routes.
For a given material, the laser energy density, E, is a key factor that affects the quality of parts fabricated by selective laser melting.
Levy, Influence of the particle size distribution on surface quality and mechanical properties in AM steel parts, Rapid Prototyping J. 17 (2011) 195-202
Online since: October 2014
Authors: Waldo Stumpf, Kevin Mark Banks, Alison Tuling, Charles Witness Siyasiya, Rorisang Maubane
Introduction
Microalloyed steels are widely used due to their good mechanical and microstructural
properties [1-3].
The austenite grain size, d, affects both the recrystallisation and the phase transformation characteristics during processing and thus the final ferrite/pearlite microstructure and mechanical properties, particularly in air-cooled plates [4-7].
Grain refinement and strain accumulation - factors influenced by dislocation recovery (DRV), static and dynamic recrystallisation (SRX and DRX) and precipitation behaviour - are important for good properties [9].
During conventional rolling of peritectic microalloyed plates the final microstructure is mostly non-uniform and coarse due to small applied pass strains which negatively affect the recrystallisation behaviour and limits the potential strength and toughness properties in these steels.
For C-Mn and C-Mn-V steels final pass strains greater than 0.2 were sufficient to initiate DRX and refine the austenite grain size to less than 40µm. 3) Adequate mechanical properties of peritectic, microalloyed plates can be achieved without the need for additional heat treatment, by manipulating roughing schedules which optimizes the austenite microstructure prior to finishing.
The austenite grain size, d, affects both the recrystallisation and the phase transformation characteristics during processing and thus the final ferrite/pearlite microstructure and mechanical properties, particularly in air-cooled plates [4-7].
Grain refinement and strain accumulation - factors influenced by dislocation recovery (DRV), static and dynamic recrystallisation (SRX and DRX) and precipitation behaviour - are important for good properties [9].
During conventional rolling of peritectic microalloyed plates the final microstructure is mostly non-uniform and coarse due to small applied pass strains which negatively affect the recrystallisation behaviour and limits the potential strength and toughness properties in these steels.
For C-Mn and C-Mn-V steels final pass strains greater than 0.2 were sufficient to initiate DRX and refine the austenite grain size to less than 40µm. 3) Adequate mechanical properties of peritectic, microalloyed plates can be achieved without the need for additional heat treatment, by manipulating roughing schedules which optimizes the austenite microstructure prior to finishing.