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Online since: September 2018
Authors: Tatiana V. Makarova, Olga A. Sotnikova, Anatoliy E. Groshev
Therefore, to determine the durability of the rubber polymer (rubber polymeric concrete), taking into account the temperature factor is a very up to date problem.
(3) where: s, Т, t - strength, MPa; temperature, 0К; time to destruction, sec, respectively; R – universal gas constant; - force, structural and mechanical factors; U0 -energy of activation of destruction; Tm - limiting temperature; tm – minimum durability at any tension or without it.
The change in the material constants , and is significantly affected by the introduction of the composite plasticizers, antioxidants, manufacturing method and structure of the composite structure.
Shutilin, Handbook of elastomer properties, Voronezh State Technological Academy publisher, Voronezh, 2003
(3) where: s, Т, t - strength, MPa; temperature, 0К; time to destruction, sec, respectively; R – universal gas constant; - force, structural and mechanical factors; U0 -energy of activation of destruction; Tm - limiting temperature; tm – minimum durability at any tension or without it.
The change in the material constants , and is significantly affected by the introduction of the composite plasticizers, antioxidants, manufacturing method and structure of the composite structure.
Shutilin, Handbook of elastomer properties, Voronezh State Technological Academy publisher, Voronezh, 2003
Online since: February 2026
Authors: Muneer A. Ismael, Hudhaifa Hamzah, Jasim Laith, Ali Alkhabbaz, Easa Haider
It was noted that the most remarkable factors affecting the convective thermal characteristics are the cavity tilt angle and elastic modulus.
All thermophysical properties of the fluid are postulated to remain constant throughout the mixed thermal convection phenomenon, except for the density variation accounted for by the buoyancy term, which corresponds to the Boussinesq approximation.
To ensure sustained computation throughout the solution process, under-relaxation factors for the momentum equations and pressure variables were set at 0.7 and 0.3, respectively, while a value of 1 was assigned to the energy equation and body forces.
Due to the increase in the thickness of the thermal boundary layer, as Ri increases to Ri = 1, the thickness of the high entropy area near the moving leg and along the entire length increases, directly affecting the thermal impact source of the SL.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 237(8), 2002-2013
All thermophysical properties of the fluid are postulated to remain constant throughout the mixed thermal convection phenomenon, except for the density variation accounted for by the buoyancy term, which corresponds to the Boussinesq approximation.
To ensure sustained computation throughout the solution process, under-relaxation factors for the momentum equations and pressure variables were set at 0.7 and 0.3, respectively, while a value of 1 was assigned to the energy equation and body forces.
Due to the increase in the thickness of the thermal boundary layer, as Ri increases to Ri = 1, the thickness of the high entropy area near the moving leg and along the entire length increases, directly affecting the thermal impact source of the SL.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 237(8), 2002-2013
Online since: March 2007
Authors: Harushige Tsubakino, Daisuke Kuroda, Shinji Fukumoto, Taiju Matsuo
Introduction
Austenitic stainless steels such as SUS304 and SUS316L have been used for medical implants due
to their superior corrosion resistance and mechanical properties.
Microstructures Fig.6 shows the microstructures of weld nugget and heat affected zone.
Any metallic carbides that often cause grain boundary corrosion were not observed in the heat affected zone by optical microscopy.
Austenitic stainless steels are better adapted to medical implants because it will hardly affect a magnetic resonance image scanning (MRI).
Welding current and weld time affect joint strength and nugget diameter.
Microstructures Fig.6 shows the microstructures of weld nugget and heat affected zone.
Any metallic carbides that often cause grain boundary corrosion were not observed in the heat affected zone by optical microscopy.
Austenitic stainless steels are better adapted to medical implants because it will hardly affect a magnetic resonance image scanning (MRI).
Welding current and weld time affect joint strength and nugget diameter.
Online since: September 2016
Authors: Stefanos Gkatzogiannis, Thomas Ummenhofer, Peter Knoedel
In the case of EN AW-6060 influence of recrystallization on the yield strength of the HAZ (heat affected zone) was taken into consideration.
Initially the transient thermal part is solved, using appropriate temperature dependent properties.
The solution of this field is governed by the same equations for both materials, changing only the material dependent properties in each case.
Mechanical parameters’ values were found in [13] for EN AW-6060 and EN AW-5754 and in [14] for filler EN AW-5356.
The edge of the component was considered to be clamped down (see Fig. 3) during mechanical analysis.
Initially the transient thermal part is solved, using appropriate temperature dependent properties.
The solution of this field is governed by the same equations for both materials, changing only the material dependent properties in each case.
Mechanical parameters’ values were found in [13] for EN AW-6060 and EN AW-5754 and in [14] for filler EN AW-5356.
The edge of the component was considered to be clamped down (see Fig. 3) during mechanical analysis.
Online since: March 2021
Authors: Francisco Fernandez-Martinez, Francisco Hernández-Olivares, Alonso Zúñiga-Suárez, Ramiro Correa-Jaramillo, Israel Briceño-Tacuri, Lenin Loaiza-Jiménez, Berenice Zúñiga-Torres
The raw materials used in the study were characterized by physical-chemical and mechanical tests.
The mechanical properties were analyzed by indirect tensile strength (Brazilian Test, ITS), applying a test speed of 0.2mm / s (Shimadzu equipment) in order to establish the optimal mixture of the combinations, by determining the optimization factor (fopt) [6], on the other hand, applies the criterion of Griffith [7] for the determination of simple compressive strength to bricks and analysis according to spanish and ecuadorian regulations [13,14].
Once this process is finished, the optimization factor of the mixtures is assessed following the research criteria of García et al [6].
In the event of an increase in the plasticity index or clay content, the bond between the soil and the cement will be affected.
Ata, Case Studies in Construction Materials Water absorption properties of sawdust lignin stabilised compressed laterite bricks, Case Stud.
The mechanical properties were analyzed by indirect tensile strength (Brazilian Test, ITS), applying a test speed of 0.2mm / s (Shimadzu equipment) in order to establish the optimal mixture of the combinations, by determining the optimization factor (fopt) [6], on the other hand, applies the criterion of Griffith [7] for the determination of simple compressive strength to bricks and analysis according to spanish and ecuadorian regulations [13,14].
Once this process is finished, the optimization factor of the mixtures is assessed following the research criteria of García et al [6].
In the event of an increase in the plasticity index or clay content, the bond between the soil and the cement will be affected.
Ata, Case Studies in Construction Materials Water absorption properties of sawdust lignin stabilised compressed laterite bricks, Case Stud.
Online since: January 2003
Authors: Mihály Réger, Seppo Louhenkilpi
The quality of the dendritic structure affects the microsegregation besides the mechanical
properties at elevated temperature.
This paper deals only with those factors of macrosegregation which are originated in the change of temperature field of solidification in time and in directions.
But the real occurence depends on other factors as well (fluid flow, nucleation etc.).
In the solidification process explained above different factors sometimes play oppositional roles.
Among the beneficial factors the lower thermal gradient in the final solidification stage can be mentioned.
This paper deals only with those factors of macrosegregation which are originated in the change of temperature field of solidification in time and in directions.
But the real occurence depends on other factors as well (fluid flow, nucleation etc.).
In the solidification process explained above different factors sometimes play oppositional roles.
Among the beneficial factors the lower thermal gradient in the final solidification stage can be mentioned.
Online since: July 2015
Authors: E.N. Popova, I.L. Deryagina
Among the factors determining the structure and superconducting properties of these wires are the fabrication routes, heat treatment regimes and alloying.
Recently the physical properties of the Nb3Sn system were revisited in [12], in which the main attention is focused on their variation with the Sn content.
The effect of Ti on the structure and properties of multifilamentary Nb3Sn-based superconductors is discussed in the next section.
In [76] we studied several multifilamentary wires with coupled Nb filaments alloyed with Ti or the Ti-doped Osprey-bronze matrix in order to reveal Ti distribution and the factors affecting their critical current densities.
Among a number of factors, ensuring high performance and stability of superconducting wires, is the amount of stabilizing copper and its specific resistance.
Recently the physical properties of the Nb3Sn system were revisited in [12], in which the main attention is focused on their variation with the Sn content.
The effect of Ti on the structure and properties of multifilamentary Nb3Sn-based superconductors is discussed in the next section.
In [76] we studied several multifilamentary wires with coupled Nb filaments alloyed with Ti or the Ti-doped Osprey-bronze matrix in order to reveal Ti distribution and the factors affecting their critical current densities.
Among a number of factors, ensuring high performance and stability of superconducting wires, is the amount of stabilizing copper and its specific resistance.
Online since: April 2012
Authors: Heng Fu Xiang, Li Jun Zhang, Yong Rui Zhao
Therefore, the chose of robot hand material should consider the above requirement of use, mechanical properties of material, technical requirements and economy.
At the same time, some other properties of the material, such as chemical stability, antioxidant properties as well as adhesive wear resistance should also be considered to some extent.
High strength carbon fiber has excellent mechanical properties, and its specific weight is less than 1/4 of common steel specific weight.
Preparation of carbon fiber reinforced PVC composite and its properties.
Study of properties of carbon fiber reinforced resin matrix composites.
At the same time, some other properties of the material, such as chemical stability, antioxidant properties as well as adhesive wear resistance should also be considered to some extent.
High strength carbon fiber has excellent mechanical properties, and its specific weight is less than 1/4 of common steel specific weight.
Preparation of carbon fiber reinforced PVC composite and its properties.
Study of properties of carbon fiber reinforced resin matrix composites.
Online since: August 2004
Authors: Am Kee Kim, Kum Bae Lee, Yong Du Jun, Seung Hoon Nahm
Meanwhile the material suffers from aging, and its properties may change gradually.
Thus the change of mechanical properties including erosion wear resistance due to aging is inevitable.
It has been reported that material properties such as the fracture toughness and tensile strength deteriorate with aging time [5].
Since the impact angle is one of the primary and difficult factors for the prediction of the erosion life, the effect of impingement angle as well as speed of impinged particle and temperature on the erosion rate of aged HK40 steel was also studied.
(2) The erosion mechanism at R.T. seems to be affected by the combination of micro-cutting and the damage accumulated by particle impact fatigue while at 400℃ it is dominated by the micro-cutting
Thus the change of mechanical properties including erosion wear resistance due to aging is inevitable.
It has been reported that material properties such as the fracture toughness and tensile strength deteriorate with aging time [5].
Since the impact angle is one of the primary and difficult factors for the prediction of the erosion life, the effect of impingement angle as well as speed of impinged particle and temperature on the erosion rate of aged HK40 steel was also studied.
(2) The erosion mechanism at R.T. seems to be affected by the combination of micro-cutting and the damage accumulated by particle impact fatigue while at 400℃ it is dominated by the micro-cutting
Online since: March 2011
Authors: Chuan Xiong Liu, Bing Hou, Wei Guo Guo, Yu Long Li, Jin Long Zou
For investigating the effect of temperature on the dynamic properties of concrete material, tests for cylindrical concrete specimens at 23℃ ~ 800℃ were carried out by using Split Hopkinson Pressure Bar (SHPB) apparatus, and the strain rates ranged from 30/s to 220/s.
In fact, the temperature has a significant effect on the mechanical properties of concrete material [15-23].
It is evident that micro-cracks will initiate and increase gradually with increasing temperatures induced by the incompatible physical properties between the cement and the aggregates inside concrete, even by the change in chemical and physical properties of concrete.
Many researchers investigated the effect of temperature on the strength of concrete under quasi-static loading condition and concluded that the strength of concrete deceases with increasing temperatures, and it can be explained by: a) dehydration of hydrated cement paste when temperature is higher than105°C; b) incompatible in physical properties between the cement and the aggregates inside concrete; c) the change in chemical and physical properties of concrete (above 5000C); d) crystalline transformation of quartz from α to β at about 573°C.
Conclusions The compressive behavior of concrete material is significantly affected by temperature and strain rate.
In fact, the temperature has a significant effect on the mechanical properties of concrete material [15-23].
It is evident that micro-cracks will initiate and increase gradually with increasing temperatures induced by the incompatible physical properties between the cement and the aggregates inside concrete, even by the change in chemical and physical properties of concrete.
Many researchers investigated the effect of temperature on the strength of concrete under quasi-static loading condition and concluded that the strength of concrete deceases with increasing temperatures, and it can be explained by: a) dehydration of hydrated cement paste when temperature is higher than105°C; b) incompatible in physical properties between the cement and the aggregates inside concrete; c) the change in chemical and physical properties of concrete (above 5000C); d) crystalline transformation of quartz from α to β at about 573°C.
Conclusions The compressive behavior of concrete material is significantly affected by temperature and strain rate.