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Online since: August 2013
Authors: Li Jun Hou, Xin Zhao Jiang, Hua Lu, Yang Wang, Xiao Yan Wang
We can get the basic test principles of the intergranular suction, based on the analyses of definition of intergranular suction, its characters and influencing factors.
The influence of the acidic aqueous solution on mechanical properties of cohesive soil and the influence of NaCl on the surface tension of water are obvious.
Those also show that wet suction is affected by the influence of the aqueous solution of chemical properties, but the impact is not the same and just as shown in Fig.5 and Fig.6.
This is an important significance for the study of the quantitative relationship between structural mechanics and mechanical properties of soil
This also can help to study the deformation properties and strength properties of the unsaturated soil with dynamic point of view.
The influence of the acidic aqueous solution on mechanical properties of cohesive soil and the influence of NaCl on the surface tension of water are obvious.
Those also show that wet suction is affected by the influence of the aqueous solution of chemical properties, but the impact is not the same and just as shown in Fig.5 and Fig.6.
This is an important significance for the study of the quantitative relationship between structural mechanics and mechanical properties of soil
This also can help to study the deformation properties and strength properties of the unsaturated soil with dynamic point of view.
Online since: October 2010
Authors: S.N. Huang, Ming Zhou, Y.J. Wang, Y.J. Zhang
Zhang
1
1
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001,
P.R.
Cutting speed is a dominant factor affecting the flank wear.
Introduction Particle reinforced metal matrix composites (MMCs) have been widely used in aerospace and automotive industries due to their excellent mechanical and physical properties such as high specific strength, high specific stiffness and high wear resistance.
The intermittent cutting process leads to the mechanical impact.
Although it will affect the surface quality, the construction of BUE can remove the workpiece material instead of the cutting edge during the cutting process.
Cutting speed is a dominant factor affecting the flank wear.
Introduction Particle reinforced metal matrix composites (MMCs) have been widely used in aerospace and automotive industries due to their excellent mechanical and physical properties such as high specific strength, high specific stiffness and high wear resistance.
The intermittent cutting process leads to the mechanical impact.
Although it will affect the surface quality, the construction of BUE can remove the workpiece material instead of the cutting edge during the cutting process.
Online since: October 2014
Authors: Catarina Meireles, Celina P. Leão, José Machado
Therefore, mathematical equations, that represents the respiratory cycle; mechanical components, giving dimension and movement to the simulator; and the electronic components, allowing data acquisition and system control are some factors that must be known and synchronized.
Therefore, the HRS simulation becomes possible when factors like mathematical equations, which represents the respiratory cycle; mechanical components, giving dimension and movement to the simulator; and the electronic components, allowing data acquisition and system control, are managed.
The lung volume is one of the most important variables and affects gas exchange.
Lung volume is not a strict value, and varies according to the elastic properties of the lung and of the chest wall muscles [5].
Volume, alveolar pressure and flow during respiratory cycle (adapted from [5]) The elastic properties of the lung are measured by defining lung compliance (C).
Therefore, the HRS simulation becomes possible when factors like mathematical equations, which represents the respiratory cycle; mechanical components, giving dimension and movement to the simulator; and the electronic components, allowing data acquisition and system control, are managed.
The lung volume is one of the most important variables and affects gas exchange.
Lung volume is not a strict value, and varies according to the elastic properties of the lung and of the chest wall muscles [5].
Volume, alveolar pressure and flow during respiratory cycle (adapted from [5]) The elastic properties of the lung are measured by defining lung compliance (C).
Online since: February 2010
Authors: V. Klemm, David Rafaja, G. Schreiber, A. Poklad, C. Wüstefeld
Introduction
The addition of ceramic particles into a metallic matrix is regarded as a possible way, how to
improve the mechanical properties of construction materials, e.g. their toughness and fracture
resistance, and to reduce their weight at the same time.
In [2], Guo et al reported enhanced dynamic mechanical properties of the 2Y-PSZ/steel; the improvement of the mechanical properties was explained by the martensitic transformation of the metallic matrix in the process of the transformation-induced plasticity (TRIP).
The results published in the literature show clearly that the mechanical properties of such MMCs are affected not only by the mechanical properties of the individual constituents but also by their interaction at the interfaces.
The possible factors influencing the preferred orientation of crystallites in the TRIP steel thin films are the anisotropy of the elastic constants in combination with the residual stress as discussed above, the morphology of the substrates affecting the morphology of the thin films and the interaction between the substrate and the film.
This encourages us to believe that the interface between the TRIP steel and the ZrO2-based ceramics is a quite important factor, which influences the mechanical properties of the composites consisting of TRIP steel and MgO stabilised ZrO2.
In [2], Guo et al reported enhanced dynamic mechanical properties of the 2Y-PSZ/steel; the improvement of the mechanical properties was explained by the martensitic transformation of the metallic matrix in the process of the transformation-induced plasticity (TRIP).
The results published in the literature show clearly that the mechanical properties of such MMCs are affected not only by the mechanical properties of the individual constituents but also by their interaction at the interfaces.
The possible factors influencing the preferred orientation of crystallites in the TRIP steel thin films are the anisotropy of the elastic constants in combination with the residual stress as discussed above, the morphology of the substrates affecting the morphology of the thin films and the interaction between the substrate and the film.
This encourages us to believe that the interface between the TRIP steel and the ZrO2-based ceramics is a quite important factor, which influences the mechanical properties of the composites consisting of TRIP steel and MgO stabilised ZrO2.
Online since: August 2011
Authors: Gang Wu, Chun Hua Zhao, Hong Ling Qin, Xian You Zhong
The tribological properties of normal UHMWPE and porous UHMWPE were studied under different loads and lubricant on an improved tribological tester.
They found that the size, shape and content of the porogen in the molding mixture greatly affect the physical properties of the final porous sample.
Tribological properties and microstructure of this porous material have also been determined and analyzed.
Porous UHMWPE has porous structure, the mechanical properties is not as strong as normal UHMWPE.
Compare with that of UHMWPE sample, we attributed this change to the decrease of mechanical properties of porous UHMWPE.
They found that the size, shape and content of the porogen in the molding mixture greatly affect the physical properties of the final porous sample.
Tribological properties and microstructure of this porous material have also been determined and analyzed.
Porous UHMWPE has porous structure, the mechanical properties is not as strong as normal UHMWPE.
Compare with that of UHMWPE sample, we attributed this change to the decrease of mechanical properties of porous UHMWPE.
Online since: August 2018
Authors: Myrna Ariati Mochtar, Raditya Perdana Rachmansyah, Wahyuaji Narottama Putra
Optimizing the Substrate Preheating Process of High Velocity Oxygen Fuel Cobalt-Based Alloy Coating on Alloyed and Carbon Steels Mechanical Properties
Myrna Ariati1,a, Wahyuaji Narottama Putra1
and Raditya Perdana Rachmansyah1
1Department of Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424,
amyrna@metal.ui.ac.id
Keywords: Keyword: High Velocity Oxygen Fuel, Stellite-1, Surface heating.
Pre-heating also aims to reduce residual thermal stress that affects adhesion and cohesion properties of the coating layer.
Although pre-heating has been shown to improve the properties of adhesives, this has not yet been the most commonly used treatment for thermal spray applications [8].
The mechanical properties were characterized through wear resistance, hardness distribution, and porosities, microstructures were examined through scanning electron microscopes (SEM), whereas the composition was checked using energy dispersive X-ray spectroscopy (EDS) and optical emission spectroscopy (OES).
This will affect the material wear rate.
Pre-heating also aims to reduce residual thermal stress that affects adhesion and cohesion properties of the coating layer.
Although pre-heating has been shown to improve the properties of adhesives, this has not yet been the most commonly used treatment for thermal spray applications [8].
The mechanical properties were characterized through wear resistance, hardness distribution, and porosities, microstructures were examined through scanning electron microscopes (SEM), whereas the composition was checked using energy dispersive X-ray spectroscopy (EDS) and optical emission spectroscopy (OES).
This will affect the material wear rate.
Online since: October 2014
Authors: Hua Yang Liang, Xiao Feng Yang, Okumura Ummin, Mu Yang
However, the traditional bamboo, steel and other materials of greenhouse skeleton exist obvious deficiencies, such as shed steel material is easy to rust corrosion and the structure of the corroded steel body parts will be destroyed after saline - alkali corrosion, affecting the structural safety.
For most of the numerical simulation, we only need to provide structural geometry, boundary conditions, material properties, loads and other engineering data.
Selection principles in choosing the calculation model (Sun Defa, 2002) are: (1) The calculation model should reflect the main force and deformation properties of the actual structure
(2) Retain the main factors and omit the secondary factors that facilitate the calculation model
References [1] Liu Zhiyuan experimental study of the engineering properties of polymer grouting material (MS, ZhengZhou University,China,2007),p.17
For most of the numerical simulation, we only need to provide structural geometry, boundary conditions, material properties, loads and other engineering data.
Selection principles in choosing the calculation model (Sun Defa, 2002) are: (1) The calculation model should reflect the main force and deformation properties of the actual structure
(2) Retain the main factors and omit the secondary factors that facilitate the calculation model
References [1] Liu Zhiyuan experimental study of the engineering properties of polymer grouting material (MS, ZhengZhou University,China,2007),p.17
Online since: January 2005
Authors: Guo Qing Zhang, Shi Fan Tian, Zhou Li, Yifei Zhang
It has been found that temperature is a major factor that determines the creep properties and
relevant mechanisms of spray formed (SF) superalloy GH742 in its deformed and heat treated fine
grained version.
The creep curves and properties tested and the observations made by TEM were summarized in this paper.
The previous study [1] shows spray formed GH742 has much higher mechanical properties at room temperature than the wrought GH742 alloy.
Hence, further investigation on its mechanical properties at elevated temperature is of significant value.
The alloy's creep properties are excellent at 650�, but deteriorate at 750� Fig. 1 Creep deformation curves Creep Properties.
The creep curves and properties tested and the observations made by TEM were summarized in this paper.
The previous study [1] shows spray formed GH742 has much higher mechanical properties at room temperature than the wrought GH742 alloy.
Hence, further investigation on its mechanical properties at elevated temperature is of significant value.
The alloy's creep properties are excellent at 650�, but deteriorate at 750� Fig. 1 Creep deformation curves Creep Properties.
Online since: November 2013
Authors: Marisa Masumi Beppu, Marina Salvarani Tonoli
The common methods to measure the setting time are the ones developed for concrete cements and provide some indication about the initial CPC setting rate but it is insufficient to characterize the whole CPC hardening process in terms of composition and mechanical properties [10,11].
So it can be concluded that the set of factors as lack of water, due the incubation in acetone, and temperature contributed to the stabilization of monetite phase.
In method I, the time to scan the whole sample was a limited factor.
Temperature dependent setting kinetics and mechanical properties of β-TCP–pyrophosphoric acid bone cement.
Hydraulic properties of tricalcium phosphate – phosphoric acid – water mixtures.
So it can be concluded that the set of factors as lack of water, due the incubation in acetone, and temperature contributed to the stabilization of monetite phase.
In method I, the time to scan the whole sample was a limited factor.
Temperature dependent setting kinetics and mechanical properties of β-TCP–pyrophosphoric acid bone cement.
Hydraulic properties of tricalcium phosphate – phosphoric acid – water mixtures.
Online since: April 2013
Authors: Fa Zhou Wang, Shu Guang Hu, Jin Yang, Yun Hua Zhang, Yun Peng Liu
Water erosion is one of the major factors for performance degradation of cement asphalt mortar (abbreviated to CA mortar, or CAM).
The mechanical properties of CA mortar are between cement-based materials and asphalt-based materials, which provide enough strength and appropriate elastic buffering [2, 3].
With the coupling effect of dynamic loads and environment, the properties of CA mortar degrade slowly which ultimately affect the slab track stability and driving safety.
Of which, water erosion is the main factor that affects the service performance of CA mortar.
The main properties were listed in Table 1.
The mechanical properties of CA mortar are between cement-based materials and asphalt-based materials, which provide enough strength and appropriate elastic buffering [2, 3].
With the coupling effect of dynamic loads and environment, the properties of CA mortar degrade slowly which ultimately affect the slab track stability and driving safety.
Of which, water erosion is the main factor that affects the service performance of CA mortar.
The main properties were listed in Table 1.