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Online since: August 2021
Authors: Lyubov Morgun, Vladimir Morgun, Denis Votrin, Viktor Nagorskiy
The listed mineral hydrated new formations of cement stone, due to their individual properties, should contribute to the foam concrete operational properties’ improvement.
The physical and mechanical properties of such systems, after the cement binder has been hardened, decisively depend on the rate of its phase transition from a viscous state to an elastic state [4] and a number of other factors [3] because the resulting qualities predetermine important macrostructural features of hardened concrete [5].
Therefore, it is now recognized that an effective method of ensuring the increased structural stability of foam mixtures, which significantly affects the mechanical properties’ value of hardened concrete, is their dispersed reinforcement with synthetic fibers [8,9].
Among the new formations, nanofibrous ones, which have increased hardness and are able to make a positive contribution to the mechanical properties of foam concrete, have appeared.
Nagorskiy, Influence of various forms of aggregate particles on the mechanical properties of foam concrete mixtures, IOP Conference Series: Materials Science and Engineering. 698 (2019) 022088
The physical and mechanical properties of such systems, after the cement binder has been hardened, decisively depend on the rate of its phase transition from a viscous state to an elastic state [4] and a number of other factors [3] because the resulting qualities predetermine important macrostructural features of hardened concrete [5].
Therefore, it is now recognized that an effective method of ensuring the increased structural stability of foam mixtures, which significantly affects the mechanical properties’ value of hardened concrete, is their dispersed reinforcement with synthetic fibers [8,9].
Among the new formations, nanofibrous ones, which have increased hardness and are able to make a positive contribution to the mechanical properties of foam concrete, have appeared.
Nagorskiy, Influence of various forms of aggregate particles on the mechanical properties of foam concrete mixtures, IOP Conference Series: Materials Science and Engineering. 698 (2019) 022088
Online since: February 2015
Authors: Norazharuddin Shah Abdullah, Nor Suhaida Shahabudin, Zainal Arifin Ahmad
Between these techniques, it is shown that FIT is arguably the most effective way to improve the mechanical properties.
However, in attaining a good mechanical property of the scaffold, porosity, pore size and pore interconnectivity is somewhat sacrificed.
Porosity (%)=Wc-WaWc-Wb×100% (1) Mechanical properties are significant factors to evaluate porous composite scaffolds.
Furthermore, HACAF and HABCAF also displayed homogenous microstructure and good interconnectivity, which are added plusses for scaffolding properties.
Conclusion The effects of processing composite coatings on the physical properties were studied.
However, in attaining a good mechanical property of the scaffold, porosity, pore size and pore interconnectivity is somewhat sacrificed.
Porosity (%)=Wc-WaWc-Wb×100% (1) Mechanical properties are significant factors to evaluate porous composite scaffolds.
Furthermore, HACAF and HABCAF also displayed homogenous microstructure and good interconnectivity, which are added plusses for scaffolding properties.
Conclusion The effects of processing composite coatings on the physical properties were studied.
Online since: September 2014
Authors: Cristina Gentilini, Francesca Praticò, Martino Colonna, Francesco Ubertini
In Section 1, a brief overview of the main degradation mechanisms affecting masonry structures is given.
Microalgal growth facilitated by a suitable combination of dampness, warmth, light and substrate properties, extensively affects the aesthetics of building façades.
Self-cleaning properties are investigated by carrying out a photo-degradation test of stains deposited on the stone surface.
Processes that lead to the production of superhydrophobic surfaces, including etching, lithography, self-assembly, chemical vapour deposition and sol–gel methods, have the disadvantage of being laborious and multistage; these factors prevent their large scale application.
It was shown that these properties were not influenced by the titania nanocoating without UV exposure.
Microalgal growth facilitated by a suitable combination of dampness, warmth, light and substrate properties, extensively affects the aesthetics of building façades.
Self-cleaning properties are investigated by carrying out a photo-degradation test of stains deposited on the stone surface.
Processes that lead to the production of superhydrophobic surfaces, including etching, lithography, self-assembly, chemical vapour deposition and sol–gel methods, have the disadvantage of being laborious and multistage; these factors prevent their large scale application.
It was shown that these properties were not influenced by the titania nanocoating without UV exposure.
Online since: February 2011
Authors: Lian Guang Wang, Le Zhou, Sui Li, Hong Tao Liu
However, studying of the component to bend the mechanical properties will be helpful to know the work mechanism of the pillar bending.
It will form foundation of mechanical properties.
Fig. 3 Failure pattern of specimen Parametric analysis By analyzing the test results, it discovers that there are many factors that affect work mechanism of GFRP tube SRHC members in bending members and the destruction pattern.
Glass filled steel tubular column Experimental Study of Mechanical Properties [J].
FRP pipe properties of reinforced concrete structures [J].
It will form foundation of mechanical properties.
Fig. 3 Failure pattern of specimen Parametric analysis By analyzing the test results, it discovers that there are many factors that affect work mechanism of GFRP tube SRHC members in bending members and the destruction pattern.
Glass filled steel tubular column Experimental Study of Mechanical Properties [J].
FRP pipe properties of reinforced concrete structures [J].
Online since: April 2008
Authors: Lan Cai, Xiao Wang, Yong Hong Fu, Hui Xia Liu, Yi Xing Chen, Xiao Xia Meng
Introduction
Recently, surface texturing as a means for enhancing tribological properties of mechanical
components has been indicated by test and application [1-4].
It indicates very clearly that crater depth varies with laser intensity and the function of plasma body correction factor.
On the contrary, smaller crater and heat affected zone is when pulse duration is short.
And heat affected zone is bigger as well.
On the contrary, smaller crater and heat affected zone is when pulse duration is short.
It indicates very clearly that crater depth varies with laser intensity and the function of plasma body correction factor.
On the contrary, smaller crater and heat affected zone is when pulse duration is short.
And heat affected zone is bigger as well.
On the contrary, smaller crater and heat affected zone is when pulse duration is short.
Online since: July 2011
Authors: Ikuo Ihara, Chen Yan Xu, Kohmei Kenzaki, Manabu Takahashi
Non-contact Measurement of Nugget Size of Spot Welding
Using Focused Air-coupled Ultrasound
CHENYAN XU1, IKUO IHARA2, a, KOHMEI KENZAKI3
AND MANABU TAKAHASHI4
1, 2, 3 Department of Mechanical Engineering, Nagaoka University of Technology,
1603-1 Kamitomioka, Nagoka, Niigata 940-2188, Japan
4 Department of Mechanical Engineering, Sendai National College of Technology,
Natori, Miyagi 981-1239, Japan
aihara@mech.nagaokaut.ac.jp
Keywords: Ultrasonic Inspection, Spot-welding, Air-coupled Ultrasound, Non-contact Evaluation, Focused Transducers, Nugget size
Abstract.
Since the size, shape and mechanical properties of a nugget which is a zone melted and re-solidified during welding are closely related to the strength of the welded structure, quantitative evaluations of them are strongly required.
Although destructive mechanical evaluations such as a chisel test, peel test as well as tensile test are often used to examine the strength of welds, non-destructive evaluation of welds is also attractive to industries because of its practical advantages such as less time and labor consuming in evaluations.
It is noted here that any influences from the refraction, diffraction, spreading and attenuation of the ultrasonic waves in the nugget are not taken into account in estimating the amplitude because it is considered that the irradiated area of ultrasound is a dominant factor affecting the amplitude in the received ultrasound.
This result shows that 7 kA may be a critical electric current affecting the nugget size sensitively.
Since the size, shape and mechanical properties of a nugget which is a zone melted and re-solidified during welding are closely related to the strength of the welded structure, quantitative evaluations of them are strongly required.
Although destructive mechanical evaluations such as a chisel test, peel test as well as tensile test are often used to examine the strength of welds, non-destructive evaluation of welds is also attractive to industries because of its practical advantages such as less time and labor consuming in evaluations.
It is noted here that any influences from the refraction, diffraction, spreading and attenuation of the ultrasonic waves in the nugget are not taken into account in estimating the amplitude because it is considered that the irradiated area of ultrasound is a dominant factor affecting the amplitude in the received ultrasound.
This result shows that 7 kA may be a critical electric current affecting the nugget size sensitively.
Online since: March 2012
Authors: Jun Ling Li, Zhen Song, Shu Xiang Luo, Yong Kui Wang
The solar radiation through the glass of windows and doors is an important factor affecting air conditioning energy consumption in summer.
Studies have shown that: the SHGC values of the glass of doors and windows are constant throughout the whole year, namely the shading properties cannot adjust properly with the seasons, and it is not conducive to building energy efficiency; if the SHGC of glass can adjust properly with the seasons, it can do benefit to building energy efficiency.
Of course, using mechanical shading systems can also solve the above problems, but in architectural design, the shading system may probably affect the building’s facade effects in the application subject to certain restrictions.
For glass itself, if the optical properties of energy saving glass can adjust as solar radiation changing at different times, that method should be a more advanced and reasonable approach.
Study of long-term stable dispersion of nanopowder Many factors can affect the dispersing behavior of nanopowder, such as the surface properties of powders, dispersant characteristics, dispersing equipments, dispersing process, etc.
Studies have shown that: the SHGC values of the glass of doors and windows are constant throughout the whole year, namely the shading properties cannot adjust properly with the seasons, and it is not conducive to building energy efficiency; if the SHGC of glass can adjust properly with the seasons, it can do benefit to building energy efficiency.
Of course, using mechanical shading systems can also solve the above problems, but in architectural design, the shading system may probably affect the building’s facade effects in the application subject to certain restrictions.
For glass itself, if the optical properties of energy saving glass can adjust as solar radiation changing at different times, that method should be a more advanced and reasonable approach.
Study of long-term stable dispersion of nanopowder Many factors can affect the dispersing behavior of nanopowder, such as the surface properties of powders, dispersant characteristics, dispersing equipments, dispersing process, etc.
Online since: February 2011
Authors: Lei Zhong, Ji Zhao Liang
Linear relations between scaling factor b and T, Logb and Logv0 have been found.
There has been a great deal of interest in recent years in determining the uniaxial extensional flow properties from a number of different techniques[1].
Recently, more and more researchers regarded melt spinning as an alternative method for the measurements of the extensional properties[5-8].
It is known that the extrusion velocity affects the pre-orientation before the extension, therefore b can also be seen as an index to indicate the degree of pre-orientation of the melt.
Fig.5 Logb versus Log v0 Fig.6 Extension viscosity versus strain rate (170℃, extrusion velocity 45mm/s) Conclusion In this work, the extensional rheological properties of polymer melts were studied by melt spinning technique.
There has been a great deal of interest in recent years in determining the uniaxial extensional flow properties from a number of different techniques[1].
Recently, more and more researchers regarded melt spinning as an alternative method for the measurements of the extensional properties[5-8].
It is known that the extrusion velocity affects the pre-orientation before the extension, therefore b can also be seen as an index to indicate the degree of pre-orientation of the melt.
Fig.5 Logb versus Log v0 Fig.6 Extension viscosity versus strain rate (170℃, extrusion velocity 45mm/s) Conclusion In this work, the extensional rheological properties of polymer melts were studied by melt spinning technique.
Online since: November 2011
Authors: Wen Bo Liu, Hai Lan Jin, Jia Wei Liu, Gang Yu
Introduction
Emulsion polymerization process and formulation determine the particle structure, configuration and surface properties of emulsions, also decided the stability of emulsions [1].
The emulsion stability is also affected by many factors, such as electrolyte, mechanical action, freeze, melting effect and storage time etc.
The capacity of polymer emulsion to withstand damage by external factors is called stability of emulsion [2].
Therefore, for guidance of emulsion’s synthesis, storage and application, it has great significance to study the stability of emulsion properties and performances [3, 4].
Paper impregnated dry strength properties within a certain period of change is largely affected by its toughness and stiffness, after cross-linking emulsion relatively well connected, bursting strength is not the highest, followed by gradual flexibility, resulting in a corresponding increase in its resistance to breaking performance, stiffness performance gradually declined.
The emulsion stability is also affected by many factors, such as electrolyte, mechanical action, freeze, melting effect and storage time etc.
The capacity of polymer emulsion to withstand damage by external factors is called stability of emulsion [2].
Therefore, for guidance of emulsion’s synthesis, storage and application, it has great significance to study the stability of emulsion properties and performances [3, 4].
Paper impregnated dry strength properties within a certain period of change is largely affected by its toughness and stiffness, after cross-linking emulsion relatively well connected, bursting strength is not the highest, followed by gradual flexibility, resulting in a corresponding increase in its resistance to breaking performance, stiffness performance gradually declined.
Online since: September 2019
Authors: Igor A. Polozov, Vadim Sufiiarov, Artem Kantyukov
The SLM process is influenced by a large number of factors related to the using materials and to the laser melting process: temperature, gravity and capillary effects, while there is no mechanical pressure during the manufacturing processes.
The information about the influence of factors on the final density of the material is presented at [8].
Despite the advantages of additive technologies, there are various defects that can be harmful to the mechanical properties of products.
"The investigation of microstructure and mechanical properties of tool steel produced by selective laser melting technology" IOP Conference Series: Materials Science and Engineering.
DOI: 10.18063/IJB.2016.02.004; [12] Popovich, A., Sufiiarov, V., Borisov, E., and Polozov, I., Microstructure and mechanical properties of Ti-6Al-4V manufacturing by SLM, Key Eng.
The information about the influence of factors on the final density of the material is presented at [8].
Despite the advantages of additive technologies, there are various defects that can be harmful to the mechanical properties of products.
"The investigation of microstructure and mechanical properties of tool steel produced by selective laser melting technology" IOP Conference Series: Materials Science and Engineering.
DOI: 10.18063/IJB.2016.02.004; [12] Popovich, A., Sufiiarov, V., Borisov, E., and Polozov, I., Microstructure and mechanical properties of Ti-6Al-4V manufacturing by SLM, Key Eng.