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Online since: June 2013
Authors: You Ping Gong, Hui Peng Chen, Jing Ni, Ting Ting Liu, Guo Jin Chen
The equipment’s processing accuracy, efficiency, reliability and degree of automation affect directly the entire production efficiency and quality of the parts.
That largely affect the optimization level of the process parameters for the band saw equipment, let alone the available numerical control system based on the optimization of process parameters.
This change will directly affect the relationship between the motor’s driving torque and the load torque.
So the dynamic characteristics of the sawing process for the band sawing machine contain many nonlinear coupling factors.
[2] CHEN Guo-jin, YAO Zhai-rong, SUN Hong, “Realization of AC Motor Vector Control Based on DSP,” Mechanical & Electrical Engineering Magazine, Vol. 21, No. 6, pp. 27–30, 2004
That largely affect the optimization level of the process parameters for the band saw equipment, let alone the available numerical control system based on the optimization of process parameters.
This change will directly affect the relationship between the motor’s driving torque and the load torque.
So the dynamic characteristics of the sawing process for the band sawing machine contain many nonlinear coupling factors.
[2] CHEN Guo-jin, YAO Zhai-rong, SUN Hong, “Realization of AC Motor Vector Control Based on DSP,” Mechanical & Electrical Engineering Magazine, Vol. 21, No. 6, pp. 27–30, 2004
Online since: September 2021
Authors: Anna S. Shorshina, Viktor A. Lomovskoy, Igor D. Simonov-Emelyanov, Anastasia A. Razzhivina
Introduction
It is known that epoxy resins (ES) and materials based on them are widely used in various areas of natural economy due to their valuable properties: low shrinkage during curing, high adhesion to various materials, chemical resistance, good physical and mechanical properties, and excellent dielectric properties [1].
The use of epoxy oligomers in the preparation of composites poses new challenges associated with the study of the relationship "structure-physicomechanical and physicochemical characteristics-synthesis of materials with desired properties."
It should be noted that the properties of the composition depend on the completeness of curing, which is determined by the amount and nature of the curing system [4].
However, the temperature dependence of the viscosity η = f (T) is a little determining factor affecting the targeted synthesis of a three-dimensional composite network.
Regulation of the properties of epoxy oligomers.
The use of epoxy oligomers in the preparation of composites poses new challenges associated with the study of the relationship "structure-physicomechanical and physicochemical characteristics-synthesis of materials with desired properties."
It should be noted that the properties of the composition depend on the completeness of curing, which is determined by the amount and nature of the curing system [4].
However, the temperature dependence of the viscosity η = f (T) is a little determining factor affecting the targeted synthesis of a three-dimensional composite network.
Regulation of the properties of epoxy oligomers.
Online since: February 2011
Authors: Wim De Waele, Álvaro Martínez-Valle, José M. Martínez-Jiménez, Patrick Goes, Koen Faes
Thermodynamics - Electromagnetics: the temperature changes in the workpiece will alter its electromagnetic properties (temperature dependence of conductivity).
5.
Thermodynamics - Solid Mechanics: the temperature increase will lead to thermal strains, and will affect the mechanical properties of the workpiece material (Johnson-Cook thermal softening).
These factors were fixed to 0 s-1 and 2e-7 s, respectively, for the simulations described in the following section with steel S235.
As it can be observed from Eq. 8, the influence of the thermal effects on the mechanical material properties during the high velocity forming process must not be disregarded.
[5] Dehra, M.S.: High Velocity Formability and Factors Affecting it.
Thermodynamics - Solid Mechanics: the temperature increase will lead to thermal strains, and will affect the mechanical properties of the workpiece material (Johnson-Cook thermal softening).
These factors were fixed to 0 s-1 and 2e-7 s, respectively, for the simulations described in the following section with steel S235.
As it can be observed from Eq. 8, the influence of the thermal effects on the mechanical material properties during the high velocity forming process must not be disregarded.
[5] Dehra, M.S.: High Velocity Formability and Factors Affecting it.
Online since: October 2014
Authors: H.S. Liu, M.H. Wang, X.Y. Ge, H.S. Luo
In essence, the materials and the heat treatment are the main factors that can affect the size precision and service life of the bearings.
The main factor that can affect the residual austenite content is temperature.
Also there will be other changes of the microstructure, as it been shown to result in significant increases in the mechanic properties, service life, size precision and wear resistance of materials in the past few decades [2,3].
Li, The effect of cryogenie treatment on the mechanical properties of Cr12 steel, J.
Zhang, Effect of deep cryogenic treatment on mechanical properties of Cr12MoV steel, Heat Treat.
The main factor that can affect the residual austenite content is temperature.
Also there will be other changes of the microstructure, as it been shown to result in significant increases in the mechanic properties, service life, size precision and wear resistance of materials in the past few decades [2,3].
Li, The effect of cryogenie treatment on the mechanical properties of Cr12 steel, J.
Zhang, Effect of deep cryogenic treatment on mechanical properties of Cr12MoV steel, Heat Treat.
Online since: September 2013
Authors: Hong Liang Pan, Jian Jun Chen, Quan Sun, Yu Xi Yan
Study on fracture behavior of steel strip under cold rolling forming process based on GTN damage model
CHEN Jianjun1, a, YAN Yuxi1,b, SUN Quan1,c and PAN Hongliang1,d
1 Mechanical and Power Engineering Department, East China University of Science and Technology, 200237, China
achenjj@mail.ecust.edu.cn, byyx2116@163.com, csunquan0501@gmail.com, dhlpan@ecust.edu.cn
Keywords: rolling forming, crack propagation, GTN model, damage
Abstract.
The phenomenon of edge cracking is complicated and it depends on macroscopic factors such as roll radius, reduction ratio, lubrication or friction, tension and mechanical properties as well as on microscopic factors such as microstructure and surface micro-topography.
The hardening properties decrease due to the increasing of the coalescence rate of void which depends on the factor fF and the void volume fraction fF can be obtained from the metallographic examination as shown in Fig. 1.
So the tension force is a very significant influence factor affecting the crack propagation during the cold rolling forming.
The phenomenon of edge cracking is complicated and it depends on macroscopic factors such as roll radius, reduction ratio, lubrication or friction, tension and mechanical properties as well as on microscopic factors such as microstructure and surface micro-topography.
The hardening properties decrease due to the increasing of the coalescence rate of void which depends on the factor fF and the void volume fraction fF can be obtained from the metallographic examination as shown in Fig. 1.
So the tension force is a very significant influence factor affecting the crack propagation during the cold rolling forming.
Online since: April 2018
Authors: Viritpon Srimaneepong, Mana Sriyudthsak, Yaninee Kosaiyakanon, Fan Pui Luen, Kamolporn Wattanasirmkit
Most previous studies concentrated on various properties like mechanical properties, solubility or bonding ability of dental cements [1,2], but few have been conducted on this electrical property of dental cements [3].
This indicates that the high bias voltage of 125 V did not affect the electrical property of the specimens in this study.
Other factors affecting the solubility of resin cements depended on the monomer conversion rate, residual monomer, resin matrix, and a lower rate of polymerization [11].
Clinically, the solubility of dental luting cements affects their mechanical properties and will affect the longevity of the prosthesis.
Braden, Dielectric properties of glass ionomer cements, J Dent Res. 60 (1981) 1311-1314
This indicates that the high bias voltage of 125 V did not affect the electrical property of the specimens in this study.
Other factors affecting the solubility of resin cements depended on the monomer conversion rate, residual monomer, resin matrix, and a lower rate of polymerization [11].
Clinically, the solubility of dental luting cements affects their mechanical properties and will affect the longevity of the prosthesis.
Braden, Dielectric properties of glass ionomer cements, J Dent Res. 60 (1981) 1311-1314
Online since: September 2011
Authors: Rui Wang, Lei Xu, Dan Zhang, Li Feng Xu
Time is not a significant factor for heat treatment.
Ni-Ti shape memory alloy can be applied to textiles for its peculiar shape memory effect and excellent mechanical properties.
The wire have uniformed appearance and mechanical property, however, the shape memory effect of the wire is not very significant for the Ni-Ti atoms were not form stable crystals.
When the treatment temperature is 500˚C, the surface structure got severely damaged, and this may affect the mechanical properties of the wire.
However, time is not a significant factor for the surface damage in heat treatment.
Ni-Ti shape memory alloy can be applied to textiles for its peculiar shape memory effect and excellent mechanical properties.
The wire have uniformed appearance and mechanical property, however, the shape memory effect of the wire is not very significant for the Ni-Ti atoms were not form stable crystals.
When the treatment temperature is 500˚C, the surface structure got severely damaged, and this may affect the mechanical properties of the wire.
However, time is not a significant factor for the surface damage in heat treatment.
Online since: January 2010
Authors: Kenji Wakashima, Shuichi Miyazaki, Hideki Hosoda, Tomonari Inamura, Yosuke Horiuchi, H.Y. Kim
Effect of Carbon Addition of Shape Memory Properties of
TiNb Alloys
Hideki Hosoda1,a
, Y.
Then, carbon addition affects the shape memory properties of TiNb alloys, and is effective to enhance the critical stress for slip.
For mechanical properties, cyclic loading-unloading tensile tests were carried out at RT using an Instron-type Shimazdu Autograph AG1kN.
Shape memory properties.
A proper amount of carbon content may be more effective to enhance mechanical properties without degradation of superelasticity.
Then, carbon addition affects the shape memory properties of TiNb alloys, and is effective to enhance the critical stress for slip.
For mechanical properties, cyclic loading-unloading tensile tests were carried out at RT using an Instron-type Shimazdu Autograph AG1kN.
Shape memory properties.
A proper amount of carbon content may be more effective to enhance mechanical properties without degradation of superelasticity.
Online since: August 2011
Authors: Qin Xiang Xia, Xiu Quan Cheng, Ying Pin Wang, Ning Yuan
The material used for the research was SPCC; the properties are list in Table 1.
Table 1 Material properties Young’s Modulus E [Gpa] Poisson’s Ratio μ Yield Stress σs [Mpa] 182.9 0.26 218 Ultimate Tensile Strength σb/ MPa Hardening Exponent, n Strengthening Factor, K 327 0.22 571.8 The proper processing parameters are essential to a successful spinning.
The orthogonal array experiment L9 (33) for 3 factors and 3 levels was designed.
Fig. 4 show the effect of the three factors on the maximum spinning force P.
Table 5 Factors and levels used for experiment No.
Table 1 Material properties Young’s Modulus E [Gpa] Poisson’s Ratio μ Yield Stress σs [Mpa] 182.9 0.26 218 Ultimate Tensile Strength σb/ MPa Hardening Exponent, n Strengthening Factor, K 327 0.22 571.8 The proper processing parameters are essential to a successful spinning.
The orthogonal array experiment L9 (33) for 3 factors and 3 levels was designed.
Fig. 4 show the effect of the three factors on the maximum spinning force P.
Table 5 Factors and levels used for experiment No.
Online since: July 2013
Authors: Julian Allwood, Martin McBrien
Each start-up requires significant time to reach steady operation with consistent product properties.
Mechanical and EM Edge Dams for Twin Roll Casting.
The EM edge dam design is constrained by several external factors.
Material properties are taken from Smithells Metal Reference [5].
An impedance boundary condition is used for the steel parts, which takes into account the skin depth of the rolls and caster structure based on their material properties and operating frequency.
Mechanical and EM Edge Dams for Twin Roll Casting.
The EM edge dam design is constrained by several external factors.
Material properties are taken from Smithells Metal Reference [5].
An impedance boundary condition is used for the steel parts, which takes into account the skin depth of the rolls and caster structure based on their material properties and operating frequency.