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Online since: September 2018
Authors: Manat Pangsai, Clare Man Ching Ko, Phichitphol Jaroensappayanant, Chi Wai Kan, Rattanaphol Mongkholrattanasit
Thus, the water absorption behaviour of the material would affect its comfort property.
During sweating, the material close to skin may get wetting and its absorption property would greatly affect the human comfort [3-8].
Therefore, the absorption rate of the material is one of the important factors in product design [9].
The fabrics contain certain percentage of elastic fibre to improve their stretch properties.
The absorption rate was measured according to the AATCC Test Method 195 - 2012 (Liquid Moisture Management Properties of Textile Fabrics) with moisture management tester.
During sweating, the material close to skin may get wetting and its absorption property would greatly affect the human comfort [3-8].
Therefore, the absorption rate of the material is one of the important factors in product design [9].
The fabrics contain certain percentage of elastic fibre to improve their stretch properties.
The absorption rate was measured according to the AATCC Test Method 195 - 2012 (Liquid Moisture Management Properties of Textile Fabrics) with moisture management tester.
Online since: July 2008
Authors: Bo Zhao, T.P. Li, Y. Zhao, Feng Jiao
Introduction
Nowadays, the engineering ceramics are widely used for their excellent physical and chemical
properties [1].
The surface topography is the residual micro-geometry with various type and size on the surface of the workpiece due to a good many factors in processing.
It is an important evaluation indicator of the surface machining quality, which not only directly affects the assembly property, stability of precision, wear resistance, corrosion resistance and sealing property of the part, but also has a great impact on the working performance and service performance of the entire equipment.
According to the mechanical properties of material, the fracture toughness of ZrO2 ceramics is greater, so the plastic deformation is main material removal mode in granular abrasive lapping and good surface quality can be obtained.
Zhao: Modern grinding technology (Mechanical Industry Press, China 2004)
The surface topography is the residual micro-geometry with various type and size on the surface of the workpiece due to a good many factors in processing.
It is an important evaluation indicator of the surface machining quality, which not only directly affects the assembly property, stability of precision, wear resistance, corrosion resistance and sealing property of the part, but also has a great impact on the working performance and service performance of the entire equipment.
According to the mechanical properties of material, the fracture toughness of ZrO2 ceramics is greater, so the plastic deformation is main material removal mode in granular abrasive lapping and good surface quality can be obtained.
Zhao: Modern grinding technology (Mechanical Industry Press, China 2004)
Online since: March 2015
Authors: Iulian Antoniac, Marin Bane, Florin Miculescu, Marian Miculescu, Lucian Toma Ciocan, Oana Preda
This paper aims to present the composition, properties and the interaction between the two materials that participates in obtaining metal-ceramic fixed prostheses, and to expose a method for analysing the bonding strength and components compatibility between dental alloys and ceramic.
Moreover, a mechanical contamination at the material’s surface is possible by the migration of the chemical elements, due to the mechanical stresses during cutting/polishing and to the hardness differences between the prosthesis components.
Our research aims to find those factors that influence the physical-chemical bonding, the diffusion layer thickness at the interface and also better sample preparation methods [2].
Also, in our work we evaluate the properties and the interaction between the two materials that participates in obtaining metal-ceramic fixed prostheses.
The sample preparation type has the advantage that the mechanical preparation of any metallographic samples minimally affects the "S" zone interface.
Moreover, a mechanical contamination at the material’s surface is possible by the migration of the chemical elements, due to the mechanical stresses during cutting/polishing and to the hardness differences between the prosthesis components.
Our research aims to find those factors that influence the physical-chemical bonding, the diffusion layer thickness at the interface and also better sample preparation methods [2].
Also, in our work we evaluate the properties and the interaction between the two materials that participates in obtaining metal-ceramic fixed prostheses.
The sample preparation type has the advantage that the mechanical preparation of any metallographic samples minimally affects the "S" zone interface.
Online since: January 2012
Authors: Jun Xiong Lin, Lan Wang, Jun Li
At the same time, the breaking tenacity of PANI/PET composite fabric was better than that of polyester fabric
1 Introduction
Polyester fabric had high intensity, good elasticity and rigid mechanical properties.
It might directly affect the production of polyester textile processing and application even could cause serious static disasters [1].
In this paper, liquid phase in-situ polymerization was used to produce the PANI /PET composite fabric with good anti-static nature and the reaction of anti-static property on PANI/PET composite fabric was explored.
At the same time, the surface morphology, chemical structure and mechanical properties of PANI/PET composite fabric were studied by means of modern testing.
If the reaction temperature was exorbitant, it may not only affect the structure of polymer chain aniline to generate "bookends" orderly, but also make the PANI/PET compound fabric on polyaniline macromolecular chain of big π key damage, leading to the antistatic performance decline.
It might directly affect the production of polyester textile processing and application even could cause serious static disasters [1].
In this paper, liquid phase in-situ polymerization was used to produce the PANI /PET composite fabric with good anti-static nature and the reaction of anti-static property on PANI/PET composite fabric was explored.
At the same time, the surface morphology, chemical structure and mechanical properties of PANI/PET composite fabric were studied by means of modern testing.
If the reaction temperature was exorbitant, it may not only affect the structure of polymer chain aniline to generate "bookends" orderly, but also make the PANI/PET compound fabric on polyaniline macromolecular chain of big π key damage, leading to the antistatic performance decline.
Online since: January 2015
Authors: Marcin Kwapisz
Introduction
Materials of an ultrafine-grained and nanometric structure exhibit mechanical properties that often surpass those of conventionally obtained materials having phases or grain structures on a micrometric scale.
Ultrafine-grained structures and nanostructures can be characterized as being unique owing to their physical and mechanical properties, such as: high low-temperature strength and/or high stress superplasticity and others [1, 3, 6, 7].
During applying high deformations, strain anisotropy occurs in the material, which causes the anisotropy of mechanical properties.
Therefore, computation results are particularly affected by: the properties of material examined, friction conditions, and the kinetic and thermal parameters describing the plastic working process.
Kwapisz: The study of accumulation roll-bonding processes of aluminum and development of the model microstructure and mechanical properties, PhD dissertation, Czestochowa University of Technology, 2007
Ultrafine-grained structures and nanostructures can be characterized as being unique owing to their physical and mechanical properties, such as: high low-temperature strength and/or high stress superplasticity and others [1, 3, 6, 7].
During applying high deformations, strain anisotropy occurs in the material, which causes the anisotropy of mechanical properties.
Therefore, computation results are particularly affected by: the properties of material examined, friction conditions, and the kinetic and thermal parameters describing the plastic working process.
Kwapisz: The study of accumulation roll-bonding processes of aluminum and development of the model microstructure and mechanical properties, PhD dissertation, Czestochowa University of Technology, 2007
Online since: October 2013
Authors: Yan Zhang, Xiao Jin Wan
Systematic Evaluation of Influence of Process Parameters on Surface Texture in Flank Milling
Yan Zhang 1,a, Xiao-Jin Wan2
1School of Foreign Languages, Wuhan University of Technology, Wuhan 430070, China
2Hubei Key Laboratory of Advanced Technology of Automotive Parts, School of Automotive Engineering Wuhan University of Technology, Wuhan 430070, PR China
aswallowgarden@163.com
Keywords: Flank milling; Surface texture; Machining accuracy
Abstract .Machined surface texture is a very critical factor since it directly affects the surface quality and part mechanical behavior.
Tool runout is considered as a factor that has a significant influence on the topography of milled surfaces.
Formulation of problem Milling surface Flat end milling cutter (a)Schematic diagram of flank milling (b) A actual multiple frame workpiece in flank milling Fig.1 Coordinate frame configuration plane milling in machining process First, consider a flank milling illustrated in Fig. 1, under the premise of disregarding the influence of material properties of the workpiece and the tool, and vibration of the machine system, the machined surface texture mainly depends on the tool geometry, tool path, and spindle run-out.
These machining parameters and geometric property parameters are all included in equations set Eq. (1).
In addition, it is noted that the run-out is important factor influencing the number of gutter strips and the roughness values.
Tool runout is considered as a factor that has a significant influence on the topography of milled surfaces.
Formulation of problem Milling surface Flat end milling cutter (a)Schematic diagram of flank milling (b) A actual multiple frame workpiece in flank milling Fig.1 Coordinate frame configuration plane milling in machining process First, consider a flank milling illustrated in Fig. 1, under the premise of disregarding the influence of material properties of the workpiece and the tool, and vibration of the machine system, the machined surface texture mainly depends on the tool geometry, tool path, and spindle run-out.
These machining parameters and geometric property parameters are all included in equations set Eq. (1).
In addition, it is noted that the run-out is important factor influencing the number of gutter strips and the roughness values.
Online since: November 2012
Authors: Geun An Lee, Sang Mok Lee, Yong Bae Kim, Jong Sup Lee, Byung Min Ahn, Du Soon Choi, K.H. Jung
Introduction
Today, the mechanical properties of products made of wrought magnesium alloys still offer the best preconditions for ultralight components with high level of requirements including specific strength and stiffness.
These enhanced mechanical properties have been opened new applicable areas of magnesium alloys, and have initiated the main driving force in the automobile industry to achieve optimum in lightweight construction and functionality by innovative concepts [1].
Orlov et al. [7] reported betterment in the mechanical property of ZK60 alloy by integration of extrusion and equal-channel angular pressing (ECAP) processes.
Ostrom [8] compared the mechanical behaviors of AM60 alloys, high pressure die-casted by two different manufacturers, and the authors mentioned that the mechanical properties was affected by the different die casting conditions depending on the manufacturers.
Therefore, it is deduced that the average grain size is the more important factor affecting the workability rather than the shape of grains, such as the fraction of elongated or equiaxed grains.
These enhanced mechanical properties have been opened new applicable areas of magnesium alloys, and have initiated the main driving force in the automobile industry to achieve optimum in lightweight construction and functionality by innovative concepts [1].
Orlov et al. [7] reported betterment in the mechanical property of ZK60 alloy by integration of extrusion and equal-channel angular pressing (ECAP) processes.
Ostrom [8] compared the mechanical behaviors of AM60 alloys, high pressure die-casted by two different manufacturers, and the authors mentioned that the mechanical properties was affected by the different die casting conditions depending on the manufacturers.
Therefore, it is deduced that the average grain size is the more important factor affecting the workability rather than the shape of grains, such as the fraction of elongated or equiaxed grains.
Online since: October 2010
Authors: Gui Wen Kang
Conventional mechanical methods couldn’t satisfy the challenging industry [2].
The affected layer has to be deep enough to melt the roughness peaks, but it must not be deeper than the valleys.
Important Factors in Laser Polishing Laser polishing has a series of advantages shown as follow: It can be used to different kind of materials.
The process depends on three factors: the surface material, its initial topography and the energy density of the laser beam.
One of the most important aspects to be controlled is the influence of the process in the polished surface properties.
The affected layer has to be deep enough to melt the roughness peaks, but it must not be deeper than the valleys.
Important Factors in Laser Polishing Laser polishing has a series of advantages shown as follow: It can be used to different kind of materials.
The process depends on three factors: the surface material, its initial topography and the energy density of the laser beam.
One of the most important aspects to be controlled is the influence of the process in the polished surface properties.
Online since: January 2005
Authors: Yong Shin Lee, K.-S. Sim
The important factors examined in this work are the welding pressure,
pressure holding time, surface roughness, and temperature.
In this study, such weak bonding by pressure welding is termed as a mechanical bonding.
In this aspect, surface expansion, flow stress as well as surface roughness could be important factors in pressure welding.
The amount of surface expansion, plastic deformation and flow stress depend mainly on bonding pressure as well as the mechanical properties of work pieces.
Although the surface roughness does not affect the bonding behavior with high bonding strength at the high temperature pressure welding, it is important in case of mechanical bonding since the aimed bonding strength is as low as 1MPa .
In this study, such weak bonding by pressure welding is termed as a mechanical bonding.
In this aspect, surface expansion, flow stress as well as surface roughness could be important factors in pressure welding.
The amount of surface expansion, plastic deformation and flow stress depend mainly on bonding pressure as well as the mechanical properties of work pieces.
Although the surface roughness does not affect the bonding behavior with high bonding strength at the high temperature pressure welding, it is important in case of mechanical bonding since the aimed bonding strength is as low as 1MPa .
Online since: July 2014
Authors: K.R. Balasubramanian, S.P. Sivapirakasham, Jiss Mathew
K R Balasubramanian1, a,Dr.S P Sivapirakasam2, b, Jiss Mathew3, c
1, 2, 3, 4Department of Mechanical Engineering, National Institute of Technology,
Tiruchirappalli-620 015, Tamil Nadu, India.
They offer superior insulating properties but how ageing and exposure could affect their insulation properties is a matter of concern.2 The traditional testing methods like insulation testing could only test whether the present properties are satisfactory.
The onset temperature reduced significantly with increase in both, duration of exposure and strength of exposure Exothermic Onset Temperature 0C Fig 4.2 Exothermic onset temperatures at different chemical exposures CONCLUSION Various factors contributing to insulation failures have been studied with special emphasis on insulation failures due to chemical interaction.
They offer superior insulating properties but how ageing and exposure could affect their insulation properties is a matter of concern.2 The traditional testing methods like insulation testing could only test whether the present properties are satisfactory.
The onset temperature reduced significantly with increase in both, duration of exposure and strength of exposure Exothermic Onset Temperature 0C Fig 4.2 Exothermic onset temperatures at different chemical exposures CONCLUSION Various factors contributing to insulation failures have been studied with special emphasis on insulation failures due to chemical interaction.