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Online since: September 2019
Authors: Djahida Lerari, Khaldoun Bachari, Adel Saoudi, Farida Khamouli, L'Hadi Atoui
Thermomechanical treatment is known to improve the mechanical properties of metallic materials.
The correlation between mechanical properties, chemical composition and/or process parameters was widely investigated by neural networks modelling.
For instance, Khalaj et al. [15] investigated the effect of chemical composition coupled with some mechanical properties on the ultimate tensile strength of API X70 whereas Azimzadegan et al. [16] studied the impact properties of this steel.
Thus, final mechanical properties of high strength low alloy steels are directly affected by ferrite grain size.
According to this figure, all sensitivity factors are positive.
The correlation between mechanical properties, chemical composition and/or process parameters was widely investigated by neural networks modelling.
For instance, Khalaj et al. [15] investigated the effect of chemical composition coupled with some mechanical properties on the ultimate tensile strength of API X70 whereas Azimzadegan et al. [16] studied the impact properties of this steel.
Thus, final mechanical properties of high strength low alloy steels are directly affected by ferrite grain size.
According to this figure, all sensitivity factors are positive.
Online since: May 2020
Authors: Maria A. Tokmakova, Andrey V. Gorin, Alexey Yu. Rodichev
Adhesion strength is provided by a number of other factors, including the diffusion of the coating components into the base material, fusion and chemical compound.
However, pretreatment of the base surfaces remains an important factor for ensuring the adhesion strength of the applied coating with the part, since in most cases, the connection of the sprayed coating with the basis occurs as a result of mechanical clutch.
The use of thermomechanical treatment of preformed coatings (applied by gas-thermal spraying) makes it possible to increase the adhesion strength of the coatings with the base while preserving the original structure and properties of the powder as much as possible [16].
Theoretical Part Analysis, justification and development of recommendations on the use of methods for testing mechanical properties of materials, including composite ones, obtained by methods of gas-flame spraying of coatings, is one of the most important stages of the study, which allows not only objectively judging the mechanical behavior of parts during operation, but also actively to manage the resource of their work, affecting the composition, structure, properties and technology for producing coatings.
The adhesion strength of coatings with the base metal is one of the important factors characterizing the possibility of using metallic coatings.
However, pretreatment of the base surfaces remains an important factor for ensuring the adhesion strength of the applied coating with the part, since in most cases, the connection of the sprayed coating with the basis occurs as a result of mechanical clutch.
The use of thermomechanical treatment of preformed coatings (applied by gas-thermal spraying) makes it possible to increase the adhesion strength of the coatings with the base while preserving the original structure and properties of the powder as much as possible [16].
Theoretical Part Analysis, justification and development of recommendations on the use of methods for testing mechanical properties of materials, including composite ones, obtained by methods of gas-flame spraying of coatings, is one of the most important stages of the study, which allows not only objectively judging the mechanical behavior of parts during operation, but also actively to manage the resource of their work, affecting the composition, structure, properties and technology for producing coatings.
The adhesion strength of coatings with the base metal is one of the important factors characterizing the possibility of using metallic coatings.
Online since: October 2019
Authors: Pu Yang, Daniel McCrum, Ming Hao Hu
Strut eccentricity is the key factor affecting the capacity of the strut and buckling strength, while joint clearance also has influence on the strut capacity and energy dissipation.
The stiffness coefficient K depends on material properties and the contact surfacing and is defined as (2).
Geometric conditions (end connections and section size) and material property follows Black’s experiment [6].
From the results of last chapter, the configuration has significant impacts compared with other factors.
Claro,2003, Dynamic analysis for planar multibody Mechanical systems with real joints,
The stiffness coefficient K depends on material properties and the contact surfacing and is defined as (2).
Geometric conditions (end connections and section size) and material property follows Black’s experiment [6].
From the results of last chapter, the configuration has significant impacts compared with other factors.
Claro,2003, Dynamic analysis for planar multibody Mechanical systems with real joints,
Online since: October 2014
Authors: Zhe Yan Yu, Zi Qiang Wang
In the meantime, main factors that affect the performance characteristics of the motor were investigated according to the formulas of motor torque.
The motor has a high degree of linearity of mechanical and controlling properties within a limited rotation angle.
Eq. 8 shows that the stiffness is the key factor affecting the magnitude of the magnetic restoring torque.
(a) (b) (c) Fig. 6 Main factors that affect the performance characteristics of the motor: (a) influence of the arc of rotor tooth on the range rotation angle; (b) influence of magnetomotive force of permanent magnets on magnetic restoring torque; (c) influence of magnetizing ampere-turns on electromagnetic torque.
The stiffness and torque constant are parameters that represent the magnitude of motor torque.The theoretical analysis of the stiffness and torque constant reveals the main factors that affect the performance characteristics of the motor are the arc of rotor tooth, the strength of the static magnetic field and the magnetizing ampere-turns.
The motor has a high degree of linearity of mechanical and controlling properties within a limited rotation angle.
Eq. 8 shows that the stiffness is the key factor affecting the magnitude of the magnetic restoring torque.
(a) (b) (c) Fig. 6 Main factors that affect the performance characteristics of the motor: (a) influence of the arc of rotor tooth on the range rotation angle; (b) influence of magnetomotive force of permanent magnets on magnetic restoring torque; (c) influence of magnetizing ampere-turns on electromagnetic torque.
The stiffness and torque constant are parameters that represent the magnitude of motor torque.The theoretical analysis of the stiffness and torque constant reveals the main factors that affect the performance characteristics of the motor are the arc of rotor tooth, the strength of the static magnetic field and the magnetizing ampere-turns.
Online since: October 2022
Authors: Svetlana A. Barannikova, Polina V. Iskhakova
Iskhakova1,b
1Institute of Strength Physics and Materials Science SB RAS, Tomsk, Russia
absa@ispms.ru, bbara71@yandex.ru
Keywords: plastic flow, strength, mechanical properties, austenitic steel, uniaxial tension.
In addition to the dislocation slip, the favorable physic-mechanical properties in austenitic steels are due to other factors, such as twinning, packing defects and deformation martensite phase [3-6].
Numerous publications are dedicated to elucidating the influence of low temperatures on the mechanical properties, microstructure and martensitic transformations in austenitic steels [7-10].
Hänninen, Effect of strain rate on the strain-induced γ, → α′-martensite transformation and mechanical properties of austenitic stainless steels, Met.
Pelleg, Mechanical Properties of Materials, 1st ed., Springer, Dordrecht, 2013
In addition to the dislocation slip, the favorable physic-mechanical properties in austenitic steels are due to other factors, such as twinning, packing defects and deformation martensite phase [3-6].
Numerous publications are dedicated to elucidating the influence of low temperatures on the mechanical properties, microstructure and martensitic transformations in austenitic steels [7-10].
Hänninen, Effect of strain rate on the strain-induced γ, → α′-martensite transformation and mechanical properties of austenitic stainless steels, Met.
Pelleg, Mechanical Properties of Materials, 1st ed., Springer, Dordrecht, 2013
Online since: June 2013
Authors: Zhong Ning Guo, Hai Shan Lian, Yu Jiao Chen
Nd:YAG laser welding between Ti and PET using pulse shaping
CHEN Yu-jiao1, a, GUO Zhong-ning2,b, LIAN Hai-shan3,c
1,2,3School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou
510006, China
achenyulinayu@yahoo.com.cn, bznguo@gdut.edu.cn, chssmy1985@163.com
Key words: laser joining, pulse shape, peak power, pulsed-width, welding quality
Abstract: PET-Ti composites have already been preliminarily used in the medical area due to the benefit of moderate biocompatibility of PET and the excellent mechanical properties of Ti.
This article describes how pulse shape, peak power and pulse-width affect the welding quality.
Meanwhile, PET-Ti composites not only own the advantage of moderate biocompatibility of PET but also the excellent mechanical properties of Ti which have already been proved to preliminarily be used in the medical area[5,6].
Physical and mechanical properties for these materials are listed in Table1.
Risk factors of early and late complications in patients undergoing endovascular aneurysm repair [J].
This article describes how pulse shape, peak power and pulse-width affect the welding quality.
Meanwhile, PET-Ti composites not only own the advantage of moderate biocompatibility of PET but also the excellent mechanical properties of Ti which have already been proved to preliminarily be used in the medical area[5,6].
Physical and mechanical properties for these materials are listed in Table1.
Risk factors of early and late complications in patients undergoing endovascular aneurysm repair [J].
Online since: August 2013
Authors: Da Ming Wu, Hong Xu, Ya Jun Zhang, Sheng De Tang
The method of improving precision of micro injection molding machine temperature control
Tang ShengDe1,a, Xu Hong*1,b, Wu Daming2,c, Zhang Yajun2,d
1College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2Engineering Research Center of Polymer Processing Equipment, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China
atsd123@126.com,bxuhong@mail.buct.edu.cn,cwudaming@vip.163.com,dzhyj@mail.buct.edu.cn
Keywords: Micro injection molding machine; Temperature control; Gradual approximation control; Control accuracy
Abstract: the temperature control accuracy of polymer melt is the main factor affecting quality precision of final products.
Temperature control which is an very important control parameters as well as shear rate and pressure control directly influence the final product properties, appearance quality and plasticizing quality in the injection molding process.
Measuring and Control principle of precision micro-injection machine We can see from figure 1 injection process of micro injection molding machine compared with conventional injection molding machine require more accurate physical parameters measurement and more rapid, accurate dynamic feedback control for control variable[8,9]. 2.2 Methods of micro injection molding machine temperature control Temperature control is a very important control parameter in the polymer injection molding process, because temperature control is same as shear rate, pressure control, which directly influence the mechanical properties, appearance quality and plasticizing quality of final product. 2.2.1 The traditional PID control PID (Proportional Integral Differential) control, which is the most widely used, constitute a control volume through the linear combination of the deviation (P), Integral (I) and Differential (D), and The control law is as follows[10]:
(1) Where e(t) is control deviation, r(t) is the set value, c (t) is the measured value, KP is proportionality factor, Ti is integral time constant, Td is differential time constant.
Research on the analysis of influencing weight repeat precision of injection products factor[J].
Temperature control which is an very important control parameters as well as shear rate and pressure control directly influence the final product properties, appearance quality and plasticizing quality in the injection molding process.
Measuring and Control principle of precision micro-injection machine We can see from figure 1 injection process of micro injection molding machine compared with conventional injection molding machine require more accurate physical parameters measurement and more rapid, accurate dynamic feedback control for control variable[8,9]. 2.2 Methods of micro injection molding machine temperature control Temperature control is a very important control parameter in the polymer injection molding process, because temperature control is same as shear rate, pressure control, which directly influence the mechanical properties, appearance quality and plasticizing quality of final product. 2.2.1 The traditional PID control PID (Proportional Integral Differential) control, which is the most widely used, constitute a control volume through the linear combination of the deviation (P), Integral (I) and Differential (D), and The control law is as follows[10]:
(1) Where e(t) is control deviation, r(t) is the set value, c (t) is the measured value, KP is proportionality factor, Ti is integral time constant, Td is differential time constant.
Research on the analysis of influencing weight repeat precision of injection products factor[J].
Online since: June 2016
Authors: Bambang Kismono Hadi, Rahmah S. Trisolicha
Trisolicha
Lightweight Structures Research Group
Faculty of Mechanical and Aerospace Engineering
Institute of Technology Bandung
Jl.
Introduction Compressive test is one of the most difficult mechanical tests on composite materials.
It seems that matrix properties plays more dominant role in determining the compressive strengths, compared to the fiber arrangements.
Matrix properties play more important role in determining compressive strengths.
[9] ASTM D3410M-03,Standard Test Method for Compressive Properties of Polymer Matrix Composite Material with Unsupported Gage Section by Shear Loading, 2008
Introduction Compressive test is one of the most difficult mechanical tests on composite materials.
It seems that matrix properties plays more dominant role in determining the compressive strengths, compared to the fiber arrangements.
Matrix properties play more important role in determining compressive strengths.
[9] ASTM D3410M-03,Standard Test Method for Compressive Properties of Polymer Matrix Composite Material with Unsupported Gage Section by Shear Loading, 2008
Online since: May 2014
Authors: Rattikorn Saodaen, Somchai Wonthaisong, Somsak Ithisoponakul, Janmanee Pichai
The researcher has focused upon considering types of mould materials, because they need efficiency properties.
A current factor affecting mould-making is that people do not truly understand the quality of milling surfaces in materials used for mould making, which is highly important in plastic moulded products.
It resulted from many factors, such as feed rates, spindle speeds and milling levels, which were main factors in the experiment.
However, the cause probably resulted from mechanical properties of the plastic mould steels, and created better quality than plastic mould steel ‘AISI-1050’, based on the testing completed in such conditions [6].
Gonz´alez,“Analysis of factors affecting the high-speed side milling of hardened diesteels”,Journal of Materials Processing Technology.Vol.162–163,200,pp. 696–701
A current factor affecting mould-making is that people do not truly understand the quality of milling surfaces in materials used for mould making, which is highly important in plastic moulded products.
It resulted from many factors, such as feed rates, spindle speeds and milling levels, which were main factors in the experiment.
However, the cause probably resulted from mechanical properties of the plastic mould steels, and created better quality than plastic mould steel ‘AISI-1050’, based on the testing completed in such conditions [6].
Gonz´alez,“Analysis of factors affecting the high-speed side milling of hardened diesteels”,Journal of Materials Processing Technology.Vol.162–163,200,pp. 696–701
Online since: November 2012
Authors: Jian Ping Wang, Xiang Yu Zhao, Cheng Lin Li
Influencing Factors of Quality of Reinforced Concrete Structures during Construction
Structural analysis of construction is based on the “slow time-varying structure”—shape, material properties and construction load of reinforced concrete buildings during construction change over time.
Design factors, construction factors, management factors and environmental factors are the most important influencing factors among the numerous influencing factors of reliability of reinforced concrete.
Design Factors.
There are many factors that directly affect the reliability of reinforced concrete structure in the formwork.
Management Factors.
Design factors, construction factors, management factors and environmental factors are the most important influencing factors among the numerous influencing factors of reliability of reinforced concrete.
Design Factors.
There are many factors that directly affect the reliability of reinforced concrete structure in the formwork.
Management Factors.