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Online since: June 2016
Authors: Jaroslav Smutny, Lubos Pazdera
All these factors lead to greater loading on track bed, which changes its shape under increasing load and thereby affects the track geometry parameters.
The kernel function then explicitly determines the properties of the transformation.
Mechanical shock was excited with a special hammer from Brüel&Kjaer, which had force sensor, in a radial direction on the rail head.
The acceleration values are therefore considerably lower than in the sensor located at the foot of the rail (Fig. 2), which was located closer to the source of mechanical impulse.
Conclusion Analysis of signals obtained during the measurement and analysis of responses to mechanical shock provide a new detailed view of the transition and transient characteristics of railway constructions.
The kernel function then explicitly determines the properties of the transformation.
Mechanical shock was excited with a special hammer from Brüel&Kjaer, which had force sensor, in a radial direction on the rail head.
The acceleration values are therefore considerably lower than in the sensor located at the foot of the rail (Fig. 2), which was located closer to the source of mechanical impulse.
Conclusion Analysis of signals obtained during the measurement and analysis of responses to mechanical shock provide a new detailed view of the transition and transient characteristics of railway constructions.
Online since: January 2007
Authors: Jiu Hua Xu, Wen Feng Ding, F. Qian
Qian
a
College of Mechanical and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.
Introduction Diamond is full of excellent performance in the physical and chemical properties, such as high hardness and thermal conductivity, low friction coefficient and thermal expansion.
However, in practice, the quite identical results have been acquired in the present series of experiments, which are mainly affected by: (i) The residual stresses will arouse the degradation of the mechanical performance of the brazed diamond.
In contrast, the grains of the electroplated and sintered abrasive tools are always enwrapped in the connecting layer through the mechanical and physical incrustation forces, which also determines the weak joining effects to the grains; (ii) Depending on the newly-formed compounds, the wetting behavior between the diamond grains and the filler material could be promoted and thus the contacting region of them could be distinctly increased, hence the joining strength is improved effectively; (iii) The residual compressive stress in the brazed diamond grains has the remarkable influences on enhancing the strength of the grains.
As a result of the comprehensive influences of the three factors mentioned above, the grains and the filler layer of brazed diamond tools are capable of achieving the joining so strong and perfect that those of the electroplated and sintered tool could never come true.
Introduction Diamond is full of excellent performance in the physical and chemical properties, such as high hardness and thermal conductivity, low friction coefficient and thermal expansion.
However, in practice, the quite identical results have been acquired in the present series of experiments, which are mainly affected by: (i) The residual stresses will arouse the degradation of the mechanical performance of the brazed diamond.
In contrast, the grains of the electroplated and sintered abrasive tools are always enwrapped in the connecting layer through the mechanical and physical incrustation forces, which also determines the weak joining effects to the grains; (ii) Depending on the newly-formed compounds, the wetting behavior between the diamond grains and the filler material could be promoted and thus the contacting region of them could be distinctly increased, hence the joining strength is improved effectively; (iii) The residual compressive stress in the brazed diamond grains has the remarkable influences on enhancing the strength of the grains.
As a result of the comprehensive influences of the three factors mentioned above, the grains and the filler layer of brazed diamond tools are capable of achieving the joining so strong and perfect that those of the electroplated and sintered tool could never come true.
Online since: June 2013
Authors: Takashi Iizuka, Shohei Kajikawa
To date, however, detailed research into injection molding using heat-treated wood biomass has not been conducted, and for injection molding of wood biomass, good material injectability, and good mechanical properties of molded products all remain targets to be realized.
From these results, we investigated the changes in the injectability of powder as well as the mechanical properties of products formed from wood powder by looking at the difference in heat treatment parameters.
It is considered that the factor that improves flowability is different from that affecting the hardness of compacted products with respect to the heat treatment of powder.
Kikata, Effect of wood species on thermal flow behavior and physical properties of thermoplastic moldings, Wood Sci Technol. , 46 (2012), 419-429
Okuma, Development of boards made from oil palm frond II: properties of binderless boards from stem-exploded fibers of oil palm frond, J.
From these results, we investigated the changes in the injectability of powder as well as the mechanical properties of products formed from wood powder by looking at the difference in heat treatment parameters.
It is considered that the factor that improves flowability is different from that affecting the hardness of compacted products with respect to the heat treatment of powder.
Kikata, Effect of wood species on thermal flow behavior and physical properties of thermoplastic moldings, Wood Sci Technol. , 46 (2012), 419-429
Okuma, Development of boards made from oil palm frond II: properties of binderless boards from stem-exploded fibers of oil palm frond, J.
Online since: November 2015
Authors: Florian Hugger, Stephan Roth, Vincent Mann, Fabian Gärtner, Konstantin Hofmann, Felix Tenner
Additionally, electrical and mechanical properties of the welded joints are determined.
Results and Discussion Especially the weld seam geometry, e.g. the shape of the weld seams is of interest with regard to mechanical and electrical properties as well as later rework steps.
In addition to the geometrical and electrical properties of welded copper connections, also the mechanical properties of the joints are relevant for many industrial applications.
A comparison of the mechanical properties of the joints with regard to the knurling parameters of the filler wires show the same behavior as the Cu-OF joints.
For this purpose, the geometrical, electrical and mechanical properties of the resulting joints are determined.
Results and Discussion Especially the weld seam geometry, e.g. the shape of the weld seams is of interest with regard to mechanical and electrical properties as well as later rework steps.
In addition to the geometrical and electrical properties of welded copper connections, also the mechanical properties of the joints are relevant for many industrial applications.
A comparison of the mechanical properties of the joints with regard to the knurling parameters of the filler wires show the same behavior as the Cu-OF joints.
For this purpose, the geometrical, electrical and mechanical properties of the resulting joints are determined.
Online since: August 2008
Authors: Long Sun Chao, Chien Hung Chang
These data could help to
predict the physical properties of materials.
These data can help to predict the mechanical properties of materials directly.
The magnitude of reflectivity would directly affect the absorptive energy of work piece from laser.
The heterogeneous rate includes the correction factor f(θ)=[2-3cos(θ)+cos3(θ)]/4.
The thermal properties used in this calculation are derived from Ref. 9, 16 and 17, in which the temperature dependence of the thermal conductivity and specific heat is considered.
These data can help to predict the mechanical properties of materials directly.
The magnitude of reflectivity would directly affect the absorptive energy of work piece from laser.
The heterogeneous rate includes the correction factor f(θ)=[2-3cos(θ)+cos3(θ)]/4.
The thermal properties used in this calculation are derived from Ref. 9, 16 and 17, in which the temperature dependence of the thermal conductivity and specific heat is considered.
Online since: May 2014
Authors: Sivakumar Naganathan, Sonny Silvadanan, Tang Yew Chung, Mark Francis Nicolasselvam, Sivadass Thiruchelvam
Additives such as recycled copper tailings and animal proteins also improve the properties of masonry mortar.
Thus, the optimum percentage of replacement that is the best in order to preserve the properties of mortar is at 10% cement replacement [11].
The main factor on doing this is the particle size of the glass wastes that are being used.
[4] Jozef, Jasiczak and Zielinski, K, Effect of protein additive on properties of mortar, J. of Cement and Concrete Composites, ScienceDirect. 28(5) (2006) 451-457
[8] Cheah Chee Ban and Ramli, M., Properties of high calcium wood ash and densified silica fume blended cement, International Journal of the Physical Sciences, 6(28) (2011) 6596-6606
Thus, the optimum percentage of replacement that is the best in order to preserve the properties of mortar is at 10% cement replacement [11].
The main factor on doing this is the particle size of the glass wastes that are being used.
[4] Jozef, Jasiczak and Zielinski, K, Effect of protein additive on properties of mortar, J. of Cement and Concrete Composites, ScienceDirect. 28(5) (2006) 451-457
[8] Cheah Chee Ban and Ramli, M., Properties of high calcium wood ash and densified silica fume blended cement, International Journal of the Physical Sciences, 6(28) (2011) 6596-6606
Online since: January 2017
Authors: Al Emran Ismail, Hilton Ahmad
However, the drawback is the hydrophilic properties of natural fiber during mixing stage with hydrophobic polymers (more significant with thermoplastic polymers), but with proper pre-treatment these problems can be eliminated.
Some researchers determine fracture energy properties of natural fiber composites by calibrating datasets available from literature and known as apparent fracture energy, however, the value is not considered to be accurate.
End tab with 25 mm length on each side were prepared to prevent the occurrence of slippage during mechanical testing.
The fracture toughness values are largely dependent upon parametric factor such as fiber orientations and crack length.
Fracture toughness value is a material property parameter to describe the ability of a discontinuities plate to resist fracture and failure.
Some researchers determine fracture energy properties of natural fiber composites by calibrating datasets available from literature and known as apparent fracture energy, however, the value is not considered to be accurate.
End tab with 25 mm length on each side were prepared to prevent the occurrence of slippage during mechanical testing.
The fracture toughness values are largely dependent upon parametric factor such as fiber orientations and crack length.
Fracture toughness value is a material property parameter to describe the ability of a discontinuities plate to resist fracture and failure.
Online since: January 2010
Authors: J. Velho, N.F. Santos
The results obtained showed that good correlations between print quality
characteristics and surface energy as well as topographic properties can be obtained.
In order to achieve the pretended goal, is critical to know how they influence paper coated properties.
Print quality properties and surface chemistry.
There is a very good negative correlation between these two properties proving that for achieving high colour print quality levels, peaks and valleys must be evaluated with particular emphasis.
Pigment particle shape, as well as consideration about surface chemistry of coated papers, is the main factors that may explain this fact.
In order to achieve the pretended goal, is critical to know how they influence paper coated properties.
Print quality properties and surface chemistry.
There is a very good negative correlation between these two properties proving that for achieving high colour print quality levels, peaks and valleys must be evaluated with particular emphasis.
Pigment particle shape, as well as consideration about surface chemistry of coated papers, is the main factors that may explain this fact.
Online since: July 2011
Authors: Ni Jun Qian, Qiu Ping Cheng, Zhi Yun Liu, Xiao Rui Dong
Introduction
Cranes are widely used in the metallurgical, mechanical and electrical, railways, ports, construction and other production areas [1].
Due to the special structure and movement forms [2], there are many risk factors existing in the lifting machinery.
For example, a change of operating system in the presentation tier would only affect the user interface code.
On the other hand, lifting height, starting weight, span and other properties are inspected safety assessment factors.
So, the system preserves these above properties when modeling for the safety assessment.
Due to the special structure and movement forms [2], there are many risk factors existing in the lifting machinery.
For example, a change of operating system in the presentation tier would only affect the user interface code.
On the other hand, lifting height, starting weight, span and other properties are inspected safety assessment factors.
So, the system preserves these above properties when modeling for the safety assessment.
Online since: October 2013
Authors: Jan Madl
Introduction
Surface integrity is important especially in finishing operations, because it affects the properties of the product, such as its fatigue strength and service life.
The properties of machined surfaces may be responsible for catastrophic defects and accidence of machines.
Optimum tool life and cutting conditions are dependent on many factors in machining processes.
Optimisation of cutting conditions also relates to the stochastic of the cutting process, the possibility of cutting tool wear and tool breakage monitoring, the possibility of adaptive control of a machine tool, and other factors.
For power characteristics of this type the following restriction can be derived [5]: (16) where: D - diameter of cutting in mm, ap - depth of cut in mm, h - mechanical effectiveness of the machine tool, kFc,xFc,yFc - constants of force equation.
The properties of machined surfaces may be responsible for catastrophic defects and accidence of machines.
Optimum tool life and cutting conditions are dependent on many factors in machining processes.
Optimisation of cutting conditions also relates to the stochastic of the cutting process, the possibility of cutting tool wear and tool breakage monitoring, the possibility of adaptive control of a machine tool, and other factors.
For power characteristics of this type the following restriction can be derived [5]: (16) where: D - diameter of cutting in mm, ap - depth of cut in mm, h - mechanical effectiveness of the machine tool, kFc,xFc,yFc - constants of force equation.