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Online since: October 2015
Authors: Štefánia Salokyová, Tibor Krenický
The article is focused on the evaluation of the effects of factors of the high-speed hydro-abrasive stream technology during the splitting of construction steels 12 050 and 11 523 through a factor experiment.
The experiment examined the effect and significance of two selected factors (type of material and movement speed of the technological head).
The research in this field is focused mainly on understanding the mechanism of the removal [1-3] and optimization of factors, which in their mutual combination affect the quality of the surface [4,5].
Except for many experimental studies focused on understanding the factors affecting the performance of the splitting process, a lot of studies were focused on modeling the process between the stream and splitting of the material for the purpose of understanding the physical background [6,7].
Gembalová, Determining the physical - mechanical properties of the material from its destruction by water jet, Dissertation, VŠB-TU, Ostrava, 2010 (in Czech)
The experiment examined the effect and significance of two selected factors (type of material and movement speed of the technological head).
The research in this field is focused mainly on understanding the mechanism of the removal [1-3] and optimization of factors, which in their mutual combination affect the quality of the surface [4,5].
Except for many experimental studies focused on understanding the factors affecting the performance of the splitting process, a lot of studies were focused on modeling the process between the stream and splitting of the material for the purpose of understanding the physical background [6,7].
Gembalová, Determining the physical - mechanical properties of the material from its destruction by water jet, Dissertation, VŠB-TU, Ostrava, 2010 (in Czech)
Online since: September 2015
Authors: Vojtech Senkerik, David Manas, Michal Stanek, Petr Kratky, Miroslav Manas, Martin Ovsik, Lenka Chvatalova
Micro-mechanical properties increased with increasing value of the dose of irradiation material.
The factors affecting the changes of polyethylene by irradiation are the molecular weight distribution, branching, degree of unsaturation, and morphology [1-6].
The micro-mechanical properties of surface layer of HDPE modified by beta radiation improved significantly.
The highest values of micro-mechanical properties were reached at radiation dose of 99 kGy.
Improvement of mico-mechanical properties of radiated HDPE has a great significance also for industry.
The factors affecting the changes of polyethylene by irradiation are the molecular weight distribution, branching, degree of unsaturation, and morphology [1-6].
The micro-mechanical properties of surface layer of HDPE modified by beta radiation improved significantly.
The highest values of micro-mechanical properties were reached at radiation dose of 99 kGy.
Improvement of mico-mechanical properties of radiated HDPE has a great significance also for industry.
Online since: September 2014
Authors: Chatchai Putson, Darika Jaaoh, Nantakan Muensit
The structures of the blends, the electrical and mechanical properties which affect electrostrictive behavior were studied.
The increase of the permittivity is one of the key factors for increasing capability of electrostrictive materials.
Therefore, the blends in this research were prepared by solution casting method for a miscibility of matrix and fillers leads to improve electromechanical properties.
The electrical properties were measured as function of filler concentration and frequency in a range of 100–105 Hz by LCR analyzer (IM 3533 HIOKI, Japan).
The electrical properties of the PU/PANI blends were studied as a function of frequency and PANI content at low filler concentration to keep Young’s modulus constant.
The increase of the permittivity is one of the key factors for increasing capability of electrostrictive materials.
Therefore, the blends in this research were prepared by solution casting method for a miscibility of matrix and fillers leads to improve electromechanical properties.
The electrical properties were measured as function of filler concentration and frequency in a range of 100–105 Hz by LCR analyzer (IM 3533 HIOKI, Japan).
The electrical properties of the PU/PANI blends were studied as a function of frequency and PANI content at low filler concentration to keep Young’s modulus constant.
Online since: October 2012
Authors: Chang Sheng Xiang, Jiang Liu, Qing Fu Li
Introduction
The welding technique of steel structure is usually one of the key factors to ensure the quality of the whole project [1].
By the means of mechanical test and analysis, physical properties and finite element simulation, we proved that proper welding measures could achieve a satisfactory result.
Tensile, bending, impulse, hardness tests were considered in the mechanical test.
By the preheating and warm preservation measures, the index properties of the bending test reach the demand of the codes, and the trend of the curves are almost same, the lower of ambient temperature, the smaller of bucking loading.
Fig. 3 Welding line, fusion line and heat affected zone of 14mm steel flat welding under -10°C Finite element analysis of temperature stress To prove the effectiveness of this welding construction method theoretically, two models are established for simulating the whole welding procedure especially including the three main factors, the varying field temperature, the temperature and its duration of welding preheating, those of heat preservation, and for analyzing the internal welding residual temperature stress by using the ANSYS finite element analysis program[6], one is steel plates connected in T shape, the other is steel plate and square tube connection.
By the means of mechanical test and analysis, physical properties and finite element simulation, we proved that proper welding measures could achieve a satisfactory result.
Tensile, bending, impulse, hardness tests were considered in the mechanical test.
By the preheating and warm preservation measures, the index properties of the bending test reach the demand of the codes, and the trend of the curves are almost same, the lower of ambient temperature, the smaller of bucking loading.
Fig. 3 Welding line, fusion line and heat affected zone of 14mm steel flat welding under -10°C Finite element analysis of temperature stress To prove the effectiveness of this welding construction method theoretically, two models are established for simulating the whole welding procedure especially including the three main factors, the varying field temperature, the temperature and its duration of welding preheating, those of heat preservation, and for analyzing the internal welding residual temperature stress by using the ANSYS finite element analysis program[6], one is steel plates connected in T shape, the other is steel plate and square tube connection.
Online since: December 2013
Authors: Mohd Firdaus Hassan, Muhammad Hatifi Mansor, Ahmad Razlan Yusoff, Mohd Tarmizy Che Kar
Experimental data have demonstrated that the geometry and number of turns of the coil would affect the performance of the energy harvester while excitation frequency as a non-physical factor also contributes to its effectiveness.
In order to achieve a high volume figure of merit FoMv and focusing on electromagnetic mechanism, there are several factors need to be considered.
The geometry, strength of the magnetic field, number of turns of the coil and the arrangement of the magnets are among the key factors that contribute to the performance of the energy harvester [10].
F=kti Eq. 10 where F is the force, kt is the transduction factor and 𝑖 is the current.
Conclusion Experimental data have demonstrated that the geometry and number of turns of the coil would affect the performance of the energy harvester while excitation frequency as a non-physical factor also contribute to its effectiveness.
In order to achieve a high volume figure of merit FoMv and focusing on electromagnetic mechanism, there are several factors need to be considered.
The geometry, strength of the magnetic field, number of turns of the coil and the arrangement of the magnets are among the key factors that contribute to the performance of the energy harvester [10].
F=kti Eq. 10 where F is the force, kt is the transduction factor and 𝑖 is the current.
Conclusion Experimental data have demonstrated that the geometry and number of turns of the coil would affect the performance of the energy harvester while excitation frequency as a non-physical factor also contribute to its effectiveness.
Online since: December 2022
Authors: A.M. Al-Mukhtar, Marwah Sabah Fakhri, Ibtihal A. Mahmood
Comparative Study of the Mechanical Properties of Spot Welded Joints
Marwah Sabah Fakhri1,a, Ahmed Al-Mukhtar2,b*,Ibtihal A.
Hence, the mechanical properties and their strength are presented.
This study focuses on the mechanical properties of spot welded joints, especially shear strength, and fatigue strength, which are the most important properties of spot welds.
Mechanical Properties of Spot Welded Joints The standard tensile shear and transverse tensile tests described in American Welding Society AWS [25].
Tensile shear testing is most widely used to evaluate spot weldability by determining the mechanical properties.
Hence, the mechanical properties and their strength are presented.
This study focuses on the mechanical properties of spot welded joints, especially shear strength, and fatigue strength, which are the most important properties of spot welds.
Mechanical Properties of Spot Welded Joints The standard tensile shear and transverse tensile tests described in American Welding Society AWS [25].
Tensile shear testing is most widely used to evaluate spot weldability by determining the mechanical properties.
Online since: July 2014
Authors: S.P. Sivapirakasham, Sreejith Mohan, P. Bineesh, K. K. Satpathy
The mass and composition of fumes from welding depends on several factors.
This paper gives a literature overview on the various factors affecting welding fumes and strategies for controlling it.
He added nano sized CaCO3 particles to the flux of a D-600R surfacing electrode and studied its effect on the resultant weld properties.
Interestingly in addition to better weld properties, he observed a tangible improvement in the arc stability.
Conclusions A systematic literature review on the various factors affecting welding fumes have been carried out and the following conclusions were made: a.
This paper gives a literature overview on the various factors affecting welding fumes and strategies for controlling it.
He added nano sized CaCO3 particles to the flux of a D-600R surfacing electrode and studied its effect on the resultant weld properties.
Interestingly in addition to better weld properties, he observed a tangible improvement in the arc stability.
Conclusions A systematic literature review on the various factors affecting welding fumes have been carried out and the following conclusions were made: a.
Online since: October 2014
Authors: Ya Fei Guo, Xin Min Hao, Yue Ling Li, Yuan Yang, Xiao Chen, Jian Ming Wang
Temperature and concentration play the main role on the alkali resistance among the factors that influence alkali resistant of nylon fibers: temperature, time, and concentration of alkali.
Instruments: constant temperature water bath pot, YG 026 H multi-function electronic fabrics strength machine (Ningbo textile instrument factory), a beaker 1.2 Experimental method 1.2.1 Mechanics performance test methods According to GB/T 14344-14344 “the chemical fiber filament tensile performance test methods”, the mechanical properties of nylon fiber were tested by YG 026 H multi-function electronic fabrics strength machine.
Fix the two factors of the amount of caustic soda, temperature and processing time when processing nylon fibers with caustic soda and test with another variation factor changes.
Combined with the three figures, it can be point out that temperature, time, concentration of alkali are all factors that affect fiber mechanical properties.
Conclusion Temperature and concentration play the main role on the alkali resistance among the factors that influence alkali resistant of nylon fibers: temperature, time, and concentration of alkali.
Instruments: constant temperature water bath pot, YG 026 H multi-function electronic fabrics strength machine (Ningbo textile instrument factory), a beaker 1.2 Experimental method 1.2.1 Mechanics performance test methods According to GB/T 14344-14344 “the chemical fiber filament tensile performance test methods”, the mechanical properties of nylon fiber were tested by YG 026 H multi-function electronic fabrics strength machine.
Fix the two factors of the amount of caustic soda, temperature and processing time when processing nylon fibers with caustic soda and test with another variation factor changes.
Combined with the three figures, it can be point out that temperature, time, concentration of alkali are all factors that affect fiber mechanical properties.
Conclusion Temperature and concentration play the main role on the alkali resistance among the factors that influence alkali resistant of nylon fibers: temperature, time, and concentration of alkali.
Online since: April 2012
Authors: Jin Song Chen
If the high-frequency vibration occurs in the hydraulic shock, it is trend to leak oil and affect the formal work of hydraulic shock.
Actually, work condition and the external factors can directly affect the output parameters changes of the hydraulic shock.
The advantages of mechanical and electrical integration intelligent hydraulic shock Adaptability to the working conditions As the mechanical and electrical integration hydraulic shock has ability of recognizing the physical property, it can adjust the impact energy parameters automatically.
Given the physical property of work objects, the performance of optimization property function is the flexibility of objects.
It can control the property and the motion of the impact shock well.
Actually, work condition and the external factors can directly affect the output parameters changes of the hydraulic shock.
The advantages of mechanical and electrical integration intelligent hydraulic shock Adaptability to the working conditions As the mechanical and electrical integration hydraulic shock has ability of recognizing the physical property, it can adjust the impact energy parameters automatically.
Given the physical property of work objects, the performance of optimization property function is the flexibility of objects.
It can control the property and the motion of the impact shock well.
Online since: May 2024
Authors: Hanae Chabba, Meryem Taoufiki, Abderrahim Barroug, Ahmed Jouaiti, Hassane Mes-Adi
These factors include deformation rate, compression direction, the atomic potential employed, sample dimensions, etc.
Compression is an applied process to evaluate the mechanical properties of materials.
Mechanical methodologies are frequently used to evaluate material deformation properties [23].
These results are attributed to the material’s anisotropic behavior, which is influenced by specific atomic arrangements affecting its response to applied forces.
Suk, Effect of the nanotube radius and the volume fraction on the mechanical properties of carbon nanotube-reinforced aluminum metal matrix composites, Molecules. 26 (2021)
Compression is an applied process to evaluate the mechanical properties of materials.
Mechanical methodologies are frequently used to evaluate material deformation properties [23].
These results are attributed to the material’s anisotropic behavior, which is influenced by specific atomic arrangements affecting its response to applied forces.
Suk, Effect of the nanotube radius and the volume fraction on the mechanical properties of carbon nanotube-reinforced aluminum metal matrix composites, Molecules. 26 (2021)