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Online since: January 2012
Authors: Jonathan P. Weiler, J.T. Wood, I. Basu
The results clearly indicate that rate of filling, nature of flow of liquid and shape of the mold greatly affect the solidification process and thereby the microstructure.
However, cast magnesium alloys accompany with them, non-uniformly distributed porosity leading to significant variations in the mechanical properties throughout the casting.
Also the variable rate of heat transfer, associated with complex mould geometries, produces a non-uniform microstructure hence affecting the local mechanical properties.
These factors compromise with the part reliability, leading to production inefficiency and degrading vehicle safety.
It is therefore, important to understand the mutual dependency between the process variables, microstructure and properties of the casted alloy.
However, cast magnesium alloys accompany with them, non-uniformly distributed porosity leading to significant variations in the mechanical properties throughout the casting.
Also the variable rate of heat transfer, associated with complex mould geometries, produces a non-uniform microstructure hence affecting the local mechanical properties.
These factors compromise with the part reliability, leading to production inefficiency and degrading vehicle safety.
It is therefore, important to understand the mutual dependency between the process variables, microstructure and properties of the casted alloy.
Online since: August 2011
Authors: Mohd Shahar Sulaiman, N. L. Robert, E. Haruman, M. Norasiah, Yupiter H.P. Manurung, M. Ridhwan, M.A.R. Ridzwan, K.A. Sunhaji, T. Ghalib, Y. C. Chan
The weld induced deformation is considered as the major stumbling block that can affect the dimensional accuracy.
This type of structural steels has been extensively used in many applications, combining good welding properties with guaranteed strength.
The mechanical and thermal properties are tabulated in Table 3.
Physical properties of St52.
In addition, physical properties of materials, chemical composition of materials, geometry and thickness might be the factors that contributed to the deviated results.
This type of structural steels has been extensively used in many applications, combining good welding properties with guaranteed strength.
The mechanical and thermal properties are tabulated in Table 3.
Physical properties of St52.
In addition, physical properties of materials, chemical composition of materials, geometry and thickness might be the factors that contributed to the deviated results.
Online since: June 2018
Authors: Haji Muhammad Muhmond, Hasse Fredriksson
The graphite nodule count, size distribution and homogenization of the nodules distribution are the factors which are of more significance for the properties of the material.
Introduction Cast iron is a composite type of alloy in which the graphite shape, size, count and distribution, all are affecting the mechanical and thermal properties of the alloy.
If the degree of non-homogeneity is higher, then the mechanical properties can be affected but if it exist locally in small areas then it might not have much influence on the overall mechanical behaviour.
A detail study was performed on these samples such as porosity distribution and comparison in the mechanical properties between different parts, but only the information regarding the graphite structure in some selected samples, is included here.
Seutens, The use of oxygen activity measurement to determine optimal properties of ductile iron during production, International Journal of Metalcasting, 4(2) (2010), 25-43.
Introduction Cast iron is a composite type of alloy in which the graphite shape, size, count and distribution, all are affecting the mechanical and thermal properties of the alloy.
If the degree of non-homogeneity is higher, then the mechanical properties can be affected but if it exist locally in small areas then it might not have much influence on the overall mechanical behaviour.
A detail study was performed on these samples such as porosity distribution and comparison in the mechanical properties between different parts, but only the information regarding the graphite structure in some selected samples, is included here.
Seutens, The use of oxygen activity measurement to determine optimal properties of ductile iron during production, International Journal of Metalcasting, 4(2) (2010), 25-43.
Online since: November 2023
Authors: Sicong Chen, Vincent Chai, Christopher Lim
In this paper, we explore the compatibility and understand the impact factors, based on commonly used resist (i.e., KrF and i-line system resist) and wet etch chemicals (i.e.
In general, the compatibility can be affected by both resist and wet etchant properties.
For example, resist type, resist thickness, resist pre-treatment, resist post-treatment, resist surface properties, wet etchant species, wet etchant concentration, etc.
No resist lifting may be because the soaked resist still maintains the mechanical properties without polymer chain broken.
Because the polymer types affect the free volume size of resist, i-line D should have a smaller free volume size than KrF C [3].
In general, the compatibility can be affected by both resist and wet etchant properties.
For example, resist type, resist thickness, resist pre-treatment, resist post-treatment, resist surface properties, wet etchant species, wet etchant concentration, etc.
No resist lifting may be because the soaked resist still maintains the mechanical properties without polymer chain broken.
Because the polymer types affect the free volume size of resist, i-line D should have a smaller free volume size than KrF C [3].
Online since: September 2014
Authors: João Roberto Ferreira, Gilbert Silva, Daniel Assis Amancio, Mírian de Lourdes Noronha Motta Melo, Luiz Eduardo Paes, José Veríssimo Ribeiro de Toledo
The machining does not equal the composition of the physical properties of metal forming, it involves forces or active and inactive stocks.
Introduction The superalloys Bronze Aluminum materials are of paramount importance in the industry and have great job in process equipment, shipbuilding, electronics and aeronautics, due to their excellent chemical and physical properties as corrosion resistance and high strength at elevated temperatures.
The screws of turbine blades, which are constantly subjected to high temperatures, have parts made of material which allows the coping not only the effect of heat but also the cavitation erosion, one of the factors responsible for corrosion.
Table 1 shows the properties of aluminum bronze C63000 series.
One of the factors affecting the morphology of the chips was the cutting speed (vc). 4.
Introduction The superalloys Bronze Aluminum materials are of paramount importance in the industry and have great job in process equipment, shipbuilding, electronics and aeronautics, due to their excellent chemical and physical properties as corrosion resistance and high strength at elevated temperatures.
The screws of turbine blades, which are constantly subjected to high temperatures, have parts made of material which allows the coping not only the effect of heat but also the cavitation erosion, one of the factors responsible for corrosion.
Table 1 shows the properties of aluminum bronze C63000 series.
One of the factors affecting the morphology of the chips was the cutting speed (vc). 4.
Online since: November 2013
Authors: Chayut Nuntadusit, Makatar Waehahyee
Normally, drying rubber sheet takes about 2-4 days depending on many factors such as temperature, velocity, humidity of hot gas in smoking room.
Important factor that affect the quality and cost of rubber smoked sheet is design of smoking room.
The physical property as color and surface condition after drying was inspected.
For the first part, the moisture ratio was decreased corresponding to decreasing of percent value of moisture in rubber, and it was also decreased corresponding to initial moisture value and external factors; jet velocity, jet temperature and jet-to-rubber sheet distance.
Kirirat, Factor affecting rubber sheet curing, RERIC Int.
Important factor that affect the quality and cost of rubber smoked sheet is design of smoking room.
The physical property as color and surface condition after drying was inspected.
For the first part, the moisture ratio was decreased corresponding to decreasing of percent value of moisture in rubber, and it was also decreased corresponding to initial moisture value and external factors; jet velocity, jet temperature and jet-to-rubber sheet distance.
Kirirat, Factor affecting rubber sheet curing, RERIC Int.
Online since: October 2012
Authors: Hui Zhang, Tie Hang Wang, Xing She Lu
The engineering properties of unsaturated loess in shallow strata are key factors that determine whether the projects will succeed or not.
A shallow stratum is directly exposed in nature, and natural factors affect physical and mechanical properties of the soil, with water content being increased because of the infiltration of rainwater in summer and autumn, and moisture being accumulated at the frozen interface because of soil freezing in winter.
After the thawing of soil in spring, there will be a layer of high water content at the frozen interface, which may give rise to problems such as the decline of bearing capacity, increase in settlement, instability of pit and landslide, thus directly affecting the safety of projects.
Influence of freeze-thaw on mechanical properties of Lanzhou loess[J].
Analysis of structural deformation properties of collapsible loess[J] .
A shallow stratum is directly exposed in nature, and natural factors affect physical and mechanical properties of the soil, with water content being increased because of the infiltration of rainwater in summer and autumn, and moisture being accumulated at the frozen interface because of soil freezing in winter.
After the thawing of soil in spring, there will be a layer of high water content at the frozen interface, which may give rise to problems such as the decline of bearing capacity, increase in settlement, instability of pit and landslide, thus directly affecting the safety of projects.
Influence of freeze-thaw on mechanical properties of Lanzhou loess[J].
Analysis of structural deformation properties of collapsible loess[J] .
Online since: July 2008
Authors: Li Qiang Tang, Yong Yang, Yong Wang, Chen Feng
A mechanical model of the visco-elastic compressible material is established in order to
investigate the viscous effect in dynamic growing crack-tip field.
The results indicate that the near-tip fields are mainly governed by the creep exponent n and Mach number M ; the stress fields of mode I and mode II is slightly affected by the elastic compressible deformation; the strain and displacement fields of mode I are deeply affected by the elastic compressible deformation.
However, the strain and displacement fields of mode II are less affected by the elastic compressible deformation.
Introduction Under high temperature, many metals show viscoelastic properties, which are closely related to environmental factors and strain rate.
So visco-elasticity has drawn much attention in the mechanical and engineering fields.
The results indicate that the near-tip fields are mainly governed by the creep exponent n and Mach number M ; the stress fields of mode I and mode II is slightly affected by the elastic compressible deformation; the strain and displacement fields of mode I are deeply affected by the elastic compressible deformation.
However, the strain and displacement fields of mode II are less affected by the elastic compressible deformation.
Introduction Under high temperature, many metals show viscoelastic properties, which are closely related to environmental factors and strain rate.
So visco-elasticity has drawn much attention in the mechanical and engineering fields.
Online since: November 2012
Authors: Li Min Zhou, Zhao Jun Meng, Li Ping Xue, Yue Jun An
The optimize design and experiment show that the new structure motor efficiency and power factor higher than the previous configuration of the asynchronous motor, and with high-efficiency and energy-saving advantages in a very broad power output range at the condition of same load.
The structure of under each pole setting permanent magnet slot easily lead to polar disorder when assembling, at the same time, in order to reduce magnetic flux leakage, the interconnection part very small of the rotor core punching what making the rotor mechanical strength will be low and affecting the stability and reliability of operation, all of these direct restricted the use and promotion of this type motor.
This kind of rotor structure overcome the shortcomings of current permanent magnet and improved rotor mechanical strength, increased anti-magnetic ability, enhanced stability and reliability of running under the premise of realization high-efficiency and achieve high power factor.
The basic properties of permanent magnetic materials NdFeB as following: residual magnet, coercively, intrinsic coercively, temperature coefficient,, stabilized operating temperature, Curie temperature , consistency of magnetic properties .
From the results can be seen, the new motor has higher efficiency and power factor, and has very broad power output range with high-efficiency and energy-saving advantages.
The structure of under each pole setting permanent magnet slot easily lead to polar disorder when assembling, at the same time, in order to reduce magnetic flux leakage, the interconnection part very small of the rotor core punching what making the rotor mechanical strength will be low and affecting the stability and reliability of operation, all of these direct restricted the use and promotion of this type motor.
This kind of rotor structure overcome the shortcomings of current permanent magnet and improved rotor mechanical strength, increased anti-magnetic ability, enhanced stability and reliability of running under the premise of realization high-efficiency and achieve high power factor.
The basic properties of permanent magnetic materials NdFeB as following: residual magnet, coercively, intrinsic coercively, temperature coefficient,, stabilized operating temperature, Curie temperature , consistency of magnetic properties .
From the results can be seen, the new motor has higher efficiency and power factor, and has very broad power output range with high-efficiency and energy-saving advantages.
Online since: August 2012
Authors: S. Delijaicov, F.C. Cione, A.C. Souza, M.A. Colosio, J.L. Rossi
This is becoming as commonplace as the demands on the mechanical properties.
These are caused by plastic deformations, thermal and mechanical action during drilling process.
This effect of plasticity affects output data strongly and should be corrected.
The function of plasticity factor used with von Mises criteria in MathLab® procedure to rebuild data.
Data from HDrill was reworked to be self-consistent by plasticity factor [7].
These are caused by plastic deformations, thermal and mechanical action during drilling process.
This effect of plasticity affects output data strongly and should be corrected.
The function of plasticity factor used with von Mises criteria in MathLab® procedure to rebuild data.
Data from HDrill was reworked to be self-consistent by plasticity factor [7].