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Online since: June 2010
Authors: Wiktoria Ratuszek, Janusz Ryś
That is why the processes governing the
texture formation in duplex steels are supposed to change in comparison to single phase steels
affecting final rolling textures of ferrite and austenite.
Crystallographic textures and a band-like morphology of ferrite and austenite are important structural factors since they exert a significant influence on further treatment and therefore determine properties of final product.
That is why the factors affecting deformation behavior and formation of rolling textures in modern grades of duplex stainless steels are the subject of permanent interest [2,5,8,9].
The thermo-mechanical treatment included hot-rolling and solution annealing at the temperature range 1150-1200°C.
The important factor affecting a development of ferrite and austenite rolling textures is a specific morphology of both phases formed upon processing.
Crystallographic textures and a band-like morphology of ferrite and austenite are important structural factors since they exert a significant influence on further treatment and therefore determine properties of final product.
That is why the factors affecting deformation behavior and formation of rolling textures in modern grades of duplex stainless steels are the subject of permanent interest [2,5,8,9].
The thermo-mechanical treatment included hot-rolling and solution annealing at the temperature range 1150-1200°C.
The important factor affecting a development of ferrite and austenite rolling textures is a specific morphology of both phases formed upon processing.
Online since: December 2012
Authors: Jie Liu, Ling Jun Zhong, Li Feng, Hang Hang Wang, Dong Dong Yang
Element analysis.Displacement mode is selected, you can conduct the analysis of cell mechanical properties.
Modeling process, the premise does not affect the calculation results on the slope line appropriate to simplify.
Its mechanical properties parameter synthesizes the suggestion by the local experience and the similar stratum experience is: Supporting capacity characteristic value fak=110KPa, modulus of deformation E0=0.01GPa, cohesive force c=5KPa, angle of internal friction =12°; gravelly soil: structure , medium dense , medium compression .
The stability of the factor analysis using finite element method.
Comparative table of the stability factors Computation number of times Safety coefficient Gravity load ratio method 1 1.41 Strength Reduction 7 1.5422 Contrasting the two kinds of methods can explain the science and rationality of the gravity load ratio method.
Modeling process, the premise does not affect the calculation results on the slope line appropriate to simplify.
Its mechanical properties parameter synthesizes the suggestion by the local experience and the similar stratum experience is: Supporting capacity characteristic value fak=110KPa, modulus of deformation E0=0.01GPa, cohesive force c=5KPa, angle of internal friction =12°; gravelly soil: structure , medium dense , medium compression .
The stability of the factor analysis using finite element method.
Comparative table of the stability factors Computation number of times Safety coefficient Gravity load ratio method 1 1.41 Strength Reduction 7 1.5422 Contrasting the two kinds of methods can explain the science and rationality of the gravity load ratio method.
Online since: October 2011
Authors: Shi Zhong Wei, Liu Jie Xu, Guo Shang Zhang, Bao Zhu Dai, Ji Wen Li
The friction coefficient of composite is scarcely affected by the alumina content.
To improve the mechanical properties, particularly fracture strength and toughness of Al2O3 ceramic composites, Mo-based composites reinforced by in-situ Al2O3 ceramic particles were developed in this paper, and the properties were researched.
So the actual density of composites depends on the combined action of above two factors.
The friction coefficient of composite is scarcely affected by the alumina content.
The friction coefficient of composite is scarcely affected by the alumina content.
To improve the mechanical properties, particularly fracture strength and toughness of Al2O3 ceramic composites, Mo-based composites reinforced by in-situ Al2O3 ceramic particles were developed in this paper, and the properties were researched.
So the actual density of composites depends on the combined action of above two factors.
The friction coefficient of composite is scarcely affected by the alumina content.
The friction coefficient of composite is scarcely affected by the alumina content.
Online since: June 2024
Authors: Darto Darto, Agus Iswantoko, Feliks Sutrisno, Pradhana Kurniawan
Thermite welding, which is a heat treatment technique, can cause changes in mechanical properties including strength, hardness, ductility and toughness [5]–[7].
Configuration of the properties of the UIC 54 railroad track is done via ANSYS 2021 R2 software.
The mechanical properties of the UIC 54 railroad are shown in Table 2.
The material used is a material whose properties have been configured as shown in Table 2.
The decreasing number of cycles value indicates that the size of the defect in the specimen has a greater length and/or width, thus affecting the age of the specimen.
Configuration of the properties of the UIC 54 railroad track is done via ANSYS 2021 R2 software.
The mechanical properties of the UIC 54 railroad are shown in Table 2.
The material used is a material whose properties have been configured as shown in Table 2.
The decreasing number of cycles value indicates that the size of the defect in the specimen has a greater length and/or width, thus affecting the age of the specimen.
Online since: November 2012
Authors: Xian Chun Song, Yan Feng Li, Jian Song, Shao Hui Liu
The article analyzes the influence factors of the thermal elongation.
From the above assumptions, heat conduction problem of the ballscrew hard milling process is 3-d transient heat conduction problem which belongs to Constant physical properties and no internal heat source.
Analysis of simulation results Milling heat and convection cooling is the main factors that affect the ballscrew temperature distribution, At the same time, the screw temperature is also affected by other factors, such as thermal conductivity between the ballscrew and support, screw and chuck, the local forced convection cooling near rapidly rotating milling cutter head in processing, etc.
The diameter of screw, the ambient temperature of the milling machine, the cooling method and the initial temperature of the workpiece are also important factors to affect the ballscrew temperature distribution.
In this paper, study the three-dimensional temperature field equation of the Whirlwind milling ballscrew based on Heat Transfer , and determine the boundary conditions; establish the ballscrew model Using ANSYS, load heat source along the screw helix, calculate the temperature distribution simulation results of the processing ballscrew, analyze the factors affecting the temperature distribution.
From the above assumptions, heat conduction problem of the ballscrew hard milling process is 3-d transient heat conduction problem which belongs to Constant physical properties and no internal heat source.
Analysis of simulation results Milling heat and convection cooling is the main factors that affect the ballscrew temperature distribution, At the same time, the screw temperature is also affected by other factors, such as thermal conductivity between the ballscrew and support, screw and chuck, the local forced convection cooling near rapidly rotating milling cutter head in processing, etc.
The diameter of screw, the ambient temperature of the milling machine, the cooling method and the initial temperature of the workpiece are also important factors to affect the ballscrew temperature distribution.
In this paper, study the three-dimensional temperature field equation of the Whirlwind milling ballscrew based on Heat Transfer , and determine the boundary conditions; establish the ballscrew model Using ANSYS, load heat source along the screw helix, calculate the temperature distribution simulation results of the processing ballscrew, analyze the factors affecting the temperature distribution.
Online since: March 2013
Authors: Andrzej Dymarek, Tomasz Dzitkowski
The selection of the dynamical properties of machines is one of the methods enhancing their durability and reliability.
Such task may be regarded as a support of the stage of designing mechanical systems, where an essential element is the fulfilment of the required dynamical properties.
These properties may be represented in a graphic or analytical form, or in a form of sequential zeros and poles, which shall be considered in the paper.
These requirements apply to obtaining the set dynamic properties of systems with control as characteristic functions (impedance, mobility).
The value of amplification factors of the control system is determined by comparing the characteristics (4), (5) and (6) with the characteristic of dynamic flexibility of the control system in the force feedback loop (8).
Such task may be regarded as a support of the stage of designing mechanical systems, where an essential element is the fulfilment of the required dynamical properties.
These properties may be represented in a graphic or analytical form, or in a form of sequential zeros and poles, which shall be considered in the paper.
These requirements apply to obtaining the set dynamic properties of systems with control as characteristic functions (impedance, mobility).
The value of amplification factors of the control system is determined by comparing the characteristics (4), (5) and (6) with the characteristic of dynamic flexibility of the control system in the force feedback loop (8).
Online since: May 2014
Authors: Rustam Kaibyshev, Marat Gazizov, Damir Tagirov, Daria Zhemchuzhnikova
Effect of Annealing on Structure and Mechanical behavior of an AA2139 Alloy
Damir Tagirov1, Daria Zhemchuzhnikova2, Marat Gazizov3, Rustam Kaibyshev4
Belgorod State University, Pobeda 85, Belgorod 308015, Russia
1 tagirov@bsu.edu.ru, 2 zhemchuzhnikova@bsu.edu.ru,3 gazizov@bsu.edu.ru, 4rustam_kaibyshev@bsu.edu.ru
Keywords: aluminum alloy, precipitation, high temperature deformation, mechanical properties, microstructure, fracture
Abstract.
These alloys exhibit excellent mechanical properties including high strength, superior creep resistance and fracture toughness, fatigue life due to the formation of the fine and uniform dispersion of the W-phase with plate-like shape on the {111}α planes of the aluminum matrix [1,2].
Numerous works were dealt with examination of the precipitation behavior and mechanical properties of these alloys [2-5].
In addition, the deformation conditions have great effects on the mechanical properties of Al–Cu–Mg–Ag alloys [3,8].
Temperature ranges of phase transformation and mechanical properties of alloys of the Al–Cu–M –Ag system with various Cu: Mg rations, Metal Sci.and Heat Treat. 47 (2005) 139-144
These alloys exhibit excellent mechanical properties including high strength, superior creep resistance and fracture toughness, fatigue life due to the formation of the fine and uniform dispersion of the W-phase with plate-like shape on the {111}α planes of the aluminum matrix [1,2].
Numerous works were dealt with examination of the precipitation behavior and mechanical properties of these alloys [2-5].
In addition, the deformation conditions have great effects on the mechanical properties of Al–Cu–Mg–Ag alloys [3,8].
Temperature ranges of phase transformation and mechanical properties of alloys of the Al–Cu–M –Ag system with various Cu: Mg rations, Metal Sci.and Heat Treat. 47 (2005) 139-144
Online since: January 2016
Authors: Tahir Ahmad, Bamban Ariwahjoedi, Muhammad Faizan, Faraz Hussain, Fahad Riaz, Rafiq Ahmad, Muhammad Kamran
In this research the effect of artificial aging/precipitation hardening on mechanical properties and microstructures of 6061 aluminum alloy weldments produced using gas tungsten welding (TIG) was studied.
Michal et al. [5] casted and extruded AA6060 aluminum alloy and studied the effect of pre-deformation together with artificial aging, solution heat treatment on the mechanical properties.
It was found pre-deformations affect the precipitation kinetic, in terms of hardness and tensile properties.
The hardness achieved is mainly due to two factors.
Marthinsen, Combined effect of deformation and artificial aging on mechanical properties of Al−Mg−Si Alloy, Trans.
Michal et al. [5] casted and extruded AA6060 aluminum alloy and studied the effect of pre-deformation together with artificial aging, solution heat treatment on the mechanical properties.
It was found pre-deformations affect the precipitation kinetic, in terms of hardness and tensile properties.
The hardness achieved is mainly due to two factors.
Marthinsen, Combined effect of deformation and artificial aging on mechanical properties of Al−Mg−Si Alloy, Trans.
Online since: May 2015
Authors: Veronika Păltânea, Horia Gavrila, Veronica Manescu Paltanea
The magnetic properties were measured with a single strip tester in the range of frequency from 10 ÷ 200 Hz at 1 T peak magnetic polarization.
The induced stresses that appear as a result of plastic deformation, will lead to a deterioration of the magnetic properties.
The values of the magnetic properties, used in the graphical representations, have been calculated by averaging the experimental sets of data.
Conclusions In order to find the best way to prepare the magnetic core of an electrical machine it should be also considered – excepting the magnetic properties of the NO FeSi and especially the values of the energy losses – the evolution of the material microstructure in the cut affected areas, which should impose recondition treatments, as well as the total economic cost of the machine.
The fully processed steel sheets are not annealed after being mechanical cut, so that local plastic strains and internal stresses alter their magnetic properties.
The induced stresses that appear as a result of plastic deformation, will lead to a deterioration of the magnetic properties.
The values of the magnetic properties, used in the graphical representations, have been calculated by averaging the experimental sets of data.
Conclusions In order to find the best way to prepare the magnetic core of an electrical machine it should be also considered – excepting the magnetic properties of the NO FeSi and especially the values of the energy losses – the evolution of the material microstructure in the cut affected areas, which should impose recondition treatments, as well as the total economic cost of the machine.
The fully processed steel sheets are not annealed after being mechanical cut, so that local plastic strains and internal stresses alter their magnetic properties.
Online since: December 2012
Authors: Yu Di Zhang, Chang Rui Zhang, Hai Feng Hu, Min Mei, Si’an Chen, Xin Bo He, Guang De Li
Preparation and mechanical properties of C/SiC joints with pins or bolts
Guangde Li 1,a, Changrui Zhang 1,b, Haifeng Hu 1,c, Yudi Zhang 1,d,
Si’an Chen 1,e, Xinbo He 2,f,and Min Mei 2,g
1National Key Laboratory of Science and Technology on Advanced Ceramic Fibers and Composites, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China
2School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
algd_nudt2003@163.com, bcrzhang@nudt.edu.cn, chfhu_nudt@nudt.edu.c, dyudizhang2002@yahoo.com.cn, esianchennudt@gmail.com, fxb_he@163.com, gmeimin1985@163.com
Keywords: C/SiC composite; Joints; Pins; Bolts; Mechanical properties
Abstract.
The stripping properties of the joints were determined by adhesive bonding method with 0.5mm/min crosshead speed.
Results and Discussion Properties of soft pins and C/SiC bolts The properties of φ3mm soft pins and M3 bolts were shown in Table 1.
Fig. 2 Photos of (a) M3 bolt and (b) φ3 pin Mechanical properties of C/SiC joints The stripping properties of C/SiC joints, which are affected by not only the joining methods, but also PIP cycles after joining the substrates and pins/bolts together, were listed in Table 2.
The inherent tensile strengths of pins or bolts are major factors due to the pins or bolts themselves rupture, meanwhile the tensile strength of pins is obviously higher because of the higher fiber volume percentage, more beneficial fiber array direction to bearing loads, larger stress area and more dense matrixes as well.
The stripping properties of the joints were determined by adhesive bonding method with 0.5mm/min crosshead speed.
Results and Discussion Properties of soft pins and C/SiC bolts The properties of φ3mm soft pins and M3 bolts were shown in Table 1.
Fig. 2 Photos of (a) M3 bolt and (b) φ3 pin Mechanical properties of C/SiC joints The stripping properties of C/SiC joints, which are affected by not only the joining methods, but also PIP cycles after joining the substrates and pins/bolts together, were listed in Table 2.
The inherent tensile strengths of pins or bolts are major factors due to the pins or bolts themselves rupture, meanwhile the tensile strength of pins is obviously higher because of the higher fiber volume percentage, more beneficial fiber array direction to bearing loads, larger stress area and more dense matrixes as well.