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Online since: December 2010
Authors: Jiu Hua Xu, Zhi Bo Yang, Ai Ju Liu
The relevant
characteristics of the special powder mixture, the microstructure of the interfacial region, which are
both the key factors for determining the joining strength among the Diamond grains, the filler layer
and the steel substrate, are investigated extensively by means of scanning electron microscope
(SEM) and energy dispersion spectrometer (EDS), as well X-ray diffraction (XRD) analysis.
Among these three categories of bonding agents, metallic bonding agents offer optimal mechanical and thermal properties and are the optimal bonding material in the fabrication of diamond tools.
Laser beams with high energy density and low energy input have the properties to function in such an application.
These attributes can achieve the goals of short heat treatment duration, small heat affected zone and consequently minimal deformation of the substrate and high efficiency of the production of diamond tools.
Otherwise, the pull-out behavior of diamond grains from the connecting layer could be observed, which is always familiar with the traditional electroplated abrasive tools because of the low binding strength induced by the mechanical incrustation force between the connecting layer metal and the grains.
Among these three categories of bonding agents, metallic bonding agents offer optimal mechanical and thermal properties and are the optimal bonding material in the fabrication of diamond tools.
Laser beams with high energy density and low energy input have the properties to function in such an application.
These attributes can achieve the goals of short heat treatment duration, small heat affected zone and consequently minimal deformation of the substrate and high efficiency of the production of diamond tools.
Otherwise, the pull-out behavior of diamond grains from the connecting layer could be observed, which is always familiar with the traditional electroplated abrasive tools because of the low binding strength induced by the mechanical incrustation force between the connecting layer metal and the grains.
Online since: November 2022
Authors: Azlin Fazlina Osman, Anwar Ul-Hamid, Khairul Anwar Abdul Halim, Asfa Amalia Ahmad Fauzi, Muaz Baderul Amin
Dolomites from different places may show different properties due to the variation of their structural, textural, and chemical properties [2].
During planetary ball milling, large solid particles are mechanically broken down into smaller solid particles without affecting their chemical structure [5].
The size of the final product is influenced by a number of factors such as rotation speed, time, ball-to-powder ratio, ball quantity, ball type, and ball diameter [5].
Due to the poor dispersion of dolomite, their reinforcing capacity may be impaired, resulting in the formation of composites with inferior properties [11].
As a result of these factors, dolomite must undergo a pre-dispersion process to minimise particle agglomeration, thereby ensuring adequate dolomite dispersion in the polymer matrix.
During planetary ball milling, large solid particles are mechanically broken down into smaller solid particles without affecting their chemical structure [5].
The size of the final product is influenced by a number of factors such as rotation speed, time, ball-to-powder ratio, ball quantity, ball type, and ball diameter [5].
Due to the poor dispersion of dolomite, their reinforcing capacity may be impaired, resulting in the formation of composites with inferior properties [11].
As a result of these factors, dolomite must undergo a pre-dispersion process to minimise particle agglomeration, thereby ensuring adequate dolomite dispersion in the polymer matrix.
Online since: August 2010
Authors: Jun Gao, S.R. Ning, Y.G. Wang
Iron loss, however, is affected by
many factors such as the rotating speed of the motor [2-3], the field that penetrates magnetic cores and
the resistance of magnetic cores.
However, the properties of ring-shaped AMM cores which are applied to motors can be different from the properties of single sheet due to many factors such as the lamination factor (Space factor: proportion of amorphous alloys in the entire laminated product), the lamination direction of the cores, the insulation between material layers and the heat treatment condition.
Two adverse factors prevented an even greater reduction in stator core loss.
The lamination factor is about 90%.
The comparison on the magnetic properties of the amorphous stator core and those of silicon steel shows the core loss of the laminated amorphous core was 42W /kg at 1 kHz, 1. 0T while the core loss of silicon steel was 102W /kg.
However, the properties of ring-shaped AMM cores which are applied to motors can be different from the properties of single sheet due to many factors such as the lamination factor (Space factor: proportion of amorphous alloys in the entire laminated product), the lamination direction of the cores, the insulation between material layers and the heat treatment condition.
Two adverse factors prevented an even greater reduction in stator core loss.
The lamination factor is about 90%.
The comparison on the magnetic properties of the amorphous stator core and those of silicon steel shows the core loss of the laminated amorphous core was 42W /kg at 1 kHz, 1. 0T while the core loss of silicon steel was 102W /kg.
Online since: June 2012
Authors: Hui Bin Wu, Di Tang, Liu Yang, Hong Wei Zheng
Some researchers studied the relationship between microscopic structure and mechanical properties [4-6].
Zhao Hui and others made a study on heat affected zone of X120 pipeline steel [9].
In rolling process, it’s more and more important to establish a mathematical model of deformation resistance which can correctly reflect the relationship between the technological parameters of hot deformation and the mechanical properties of metallic material so as to control the rolling process accurately and improve the quality of the products [11-13].
Chemical compositions and mechanical properties of the steels tested were shown in Table 1.
Fig.5 Effect of deformation temperature on deformation rate sensitivity Establishment of the mathematical model for the deformation resistance Deformation resistance of steel depends on the composition, the microstructure, deformation degree, deformation temperature, deformation rate and other factors in deformation process.
Zhao Hui and others made a study on heat affected zone of X120 pipeline steel [9].
In rolling process, it’s more and more important to establish a mathematical model of deformation resistance which can correctly reflect the relationship between the technological parameters of hot deformation and the mechanical properties of metallic material so as to control the rolling process accurately and improve the quality of the products [11-13].
Chemical compositions and mechanical properties of the steels tested were shown in Table 1.
Fig.5 Effect of deformation temperature on deformation rate sensitivity Establishment of the mathematical model for the deformation resistance Deformation resistance of steel depends on the composition, the microstructure, deformation degree, deformation temperature, deformation rate and other factors in deformation process.
Online since: October 2023
Authors: Jai Prakash, Ranveer Kumar, Arvind Kumar, Abhishek Kumar
Introduction
AA7050-7.5% B4C-T6 Composites are generally used as structural components of aerospace and automobiles due to their higher mechanical properties.
The predominant factors of electro-discharge machining are peak current, Pulse on time, and gap voltage [6, 7].
Evaluation of wear properties of stir cast AA7050-10% B4C ex situ composite through fuzzy-TOPSIS MCDM method.
Study on the Development of a Quaternary Layer of B4C-TiB2-Al3TiAl in AA7050/B4C Ex-Situ Composite and Influence of Heat Treatment on Mechanical and Wear Properties.
Synthesis, properties and EDM behavior of 10 wt.-% ZrB2 reinforced AA7178 matrix composites.
The predominant factors of electro-discharge machining are peak current, Pulse on time, and gap voltage [6, 7].
Evaluation of wear properties of stir cast AA7050-10% B4C ex situ composite through fuzzy-TOPSIS MCDM method.
Study on the Development of a Quaternary Layer of B4C-TiB2-Al3TiAl in AA7050/B4C Ex-Situ Composite and Influence of Heat Treatment on Mechanical and Wear Properties.
Synthesis, properties and EDM behavior of 10 wt.-% ZrB2 reinforced AA7178 matrix composites.
Online since: June 2008
Authors: Yannick Champion, Sophie Nowak
The activation volume can be expressed as ** ln
τ
γ
∂
∂
=
&
kTv , but it is common to plot
*
ln v
MkT
≈
∆
∆ ε
σ
&
(σis the stress,ε& is the strain rate, M is the Taylor factor) as a function of σ.
Stress relaxation The stress relaxation tests consisted in interrupting the sample loading during a mechanical test (in compression in the present study).
The mechanical tests were carried with a MTS/20 machine.
The results indicate that the metal properties are not strongly affected by the strain history.
Calculation of the strain rate sensitivity, m , from a log-log plot of the stress as a function of the strain rate measured during creep testing in nano indentation. 3≈= fsnHK σ , the constraint factor is the ratio of the hardness measured by nanoindentation ( MPa Hn 1500= ) by the flow stress of the material measured in a macroscopic mechanical testing ( MPafs500=σ ) [6].
Stress relaxation The stress relaxation tests consisted in interrupting the sample loading during a mechanical test (in compression in the present study).
The mechanical tests were carried with a MTS/20 machine.
The results indicate that the metal properties are not strongly affected by the strain history.
Calculation of the strain rate sensitivity, m , from a log-log plot of the stress as a function of the strain rate measured during creep testing in nano indentation. 3≈= fsnHK σ , the constraint factor is the ratio of the hardness measured by nanoindentation ( MPa Hn 1500= ) by the flow stress of the material measured in a macroscopic mechanical testing ( MPafs500=σ ) [6].
Online since: April 2015
Authors: Chen Hsueh Chiang, Chien Tzu Cheng
It determines the formation of the bulk microstructure, which is directly related to the mechanical and chemical properties.
In the VCC process, various casting parameters, such as casting speed, which affect the temperature gradient and growth rate, are manipulated to control the microstructure formation during solidification.
The thermal and physical properties used in the present calculations are listed in Tables 2 and 3.
The zinc content thus affects the grain size.
Using the CA method to simulate the solidification microstructure in the VCC process reproduces the evolution of grain growth, with results similar to those of actual casting obtained. 2 The casting speed is one of the main factors that affect the evolution of the solidification microstructure of brass rods.
In the VCC process, various casting parameters, such as casting speed, which affect the temperature gradient and growth rate, are manipulated to control the microstructure formation during solidification.
The thermal and physical properties used in the present calculations are listed in Tables 2 and 3.
The zinc content thus affects the grain size.
Using the CA method to simulate the solidification microstructure in the VCC process reproduces the evolution of grain growth, with results similar to those of actual casting obtained. 2 The casting speed is one of the main factors that affect the evolution of the solidification microstructure of brass rods.
Online since: December 2010
Authors: Hua Peng, Chun Hua You, Ye Long Deng, Hong Yu Zhang, Jin Zhang
Peng et al. verified the MCD method in theory and presented a matrix formula using modal vector difference before and after damage to evaluate the damage factors of structures [5].
Fortunately the origin location of the CS will not affect displacement calculation result.
The section size of each member is 20 mm × 20 mm, and Table 1 shows the material properties.
Table 1 Material properties of the frame Material type Elastic modulus E [MPa] Poisson’s ratio ν Density ρ [kg/m3] Steel 2×1011 0.3 7800 For the simplicity, it is hypothesized that the damage will only reduce the local elastic modulus by damage factor D and will not change the mass and section shape [5].
Yam: Mechanical Systems and Signal Processing Vol. 21(2007), p. 2198-2211
Fortunately the origin location of the CS will not affect displacement calculation result.
The section size of each member is 20 mm × 20 mm, and Table 1 shows the material properties.
Table 1 Material properties of the frame Material type Elastic modulus E [MPa] Poisson’s ratio ν Density ρ [kg/m3] Steel 2×1011 0.3 7800 For the simplicity, it is hypothesized that the damage will only reduce the local elastic modulus by damage factor D and will not change the mass and section shape [5].
Yam: Mechanical Systems and Signal Processing Vol. 21(2007), p. 2198-2211
Online since: December 2019
Authors: Kseniya N. Sukhina, Vyacheslav V. Drozdov, Fedor F. Leychu, Valeria A. Pshenichkina
Introduction
Reinforced concrete is the main building material in the construction of buildings and structures for various purposes due to its properties such as durability, high resistance to static and dynamic loads, resistance to weather impacts, low operation costs [1].
The first group of limiting states, associated with the structures bearing capacity exhaustion, evaluates safety taking into account such factors as rare spontaneous effects not stipulated by the normal operation conditions, gross errors in all life cycles of the structure.
What way these calculated and admissible parameters values will affect in the long-term operation course with the material properties deterioration and the sections wear is unknown.
In the general case, the limiting states of the structures used should not be determined by the force factors, but by the limiting deformations.
Murashev, Tremendoustomato, the stiffness and strength of concrete, the Publishing house of the Ministry of construction of enterprises of mechanical engineering, Moscow, 1950
The first group of limiting states, associated with the structures bearing capacity exhaustion, evaluates safety taking into account such factors as rare spontaneous effects not stipulated by the normal operation conditions, gross errors in all life cycles of the structure.
What way these calculated and admissible parameters values will affect in the long-term operation course with the material properties deterioration and the sections wear is unknown.
In the general case, the limiting states of the structures used should not be determined by the force factors, but by the limiting deformations.
Murashev, Tremendoustomato, the stiffness and strength of concrete, the Publishing house of the Ministry of construction of enterprises of mechanical engineering, Moscow, 1950
Online since: October 2014
Authors: W. Radoslaw Maruda, Grzegorz Królczyk, Stanisław Legutko
Surface Morphology is now recognized as one of the key factor in advanced machining technology for functional behaviour of a part [6].
Also, increment in depth of cut also negatively affects roughness of parts and produces an increment of cutting forces, while increasing the cutting speed are improves surface finish while reducing the cutting forces [10].
The austenitic stainless steels are a combination of good mechanical properties and good corrosion resistance.
In this respect is a need to understand how the properties of a surface layer generated in turning process.
The main purpose of this study was to determine the effect of cutting speed as a key process factor in controlling surface quality.
Also, increment in depth of cut also negatively affects roughness of parts and produces an increment of cutting forces, while increasing the cutting speed are improves surface finish while reducing the cutting forces [10].
The austenitic stainless steels are a combination of good mechanical properties and good corrosion resistance.
In this respect is a need to understand how the properties of a surface layer generated in turning process.
The main purpose of this study was to determine the effect of cutting speed as a key process factor in controlling surface quality.