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Online since: February 2012
Authors: Xue Song Zhang
The mechanism and influence factors of concrete carbonation can be seen in the reference [1].
To study the fly ash influence on the anti-carbonation of concrete properties, fly ash in concrete is increased from 10% to 60%.
Among the internal chemical factors influencing concrete carbonation depth, Ca(OH)2 is the main reaction, which can react with CO2 to slow the process of carbonation of concrete.
Water-binder ratio of high volume concrete containing fly ash carbonation properties Water-binder ratio of concrete carbonation has great impact on the carbonation: water-binder ratio change directly affects the concrete strength and the changes of concrete strength will affect the ability of concrete anti-carbonation ability.
Conclusions This high performance of high volume concrete containing fly ash carbonation properties are studied in this paper.
To study the fly ash influence on the anti-carbonation of concrete properties, fly ash in concrete is increased from 10% to 60%.
Among the internal chemical factors influencing concrete carbonation depth, Ca(OH)2 is the main reaction, which can react with CO2 to slow the process of carbonation of concrete.
Water-binder ratio of high volume concrete containing fly ash carbonation properties Water-binder ratio of concrete carbonation has great impact on the carbonation: water-binder ratio change directly affects the concrete strength and the changes of concrete strength will affect the ability of concrete anti-carbonation ability.
Conclusions This high performance of high volume concrete containing fly ash carbonation properties are studied in this paper.
Online since: August 2019
Authors: Anatoliy G. Demianenko
The accompanying component is caused by the mobile inertia load or by the changeable length and they are not trivial only when this factor exists.
Panovko wrote: “The problem of dynamic acting of movable load, 100th anniversary of which we have celebrated in 1947, by today did not lost their up-to-date status, the life still set new tasks and caused by this following motion of the theory to forward” In agile XX-XXI centuries significant increasing of masses and velocities of motion sets new tasks, requires their solution, causes in its turn developing new approaches in the mechanical and mathematical modeling, new and improving of old methods of their research, that allow more comprehensively discover all quantitative and qualitative features of the kinematical and dynamical properties of the system motion.
The dynamical problem of moving variable-length objects of and objects in longitudinal motion such as threads, wires, profile rod In dependency of the analytical model of inertia properties of the elastic structure and acting movable loading we could use the following four variants of statement of the problem of influence of the movable loading on the elastic structures and buildings [5,8].
Naturally, this kinship also affects the nature of the movements of the objects being studied.
Two-wave processes in the mechanical systems, “Lybid’, Kyiv.Ukraine, (1991), 83-94
Panovko wrote: “The problem of dynamic acting of movable load, 100th anniversary of which we have celebrated in 1947, by today did not lost their up-to-date status, the life still set new tasks and caused by this following motion of the theory to forward” In agile XX-XXI centuries significant increasing of masses and velocities of motion sets new tasks, requires their solution, causes in its turn developing new approaches in the mechanical and mathematical modeling, new and improving of old methods of their research, that allow more comprehensively discover all quantitative and qualitative features of the kinematical and dynamical properties of the system motion.
The dynamical problem of moving variable-length objects of and objects in longitudinal motion such as threads, wires, profile rod In dependency of the analytical model of inertia properties of the elastic structure and acting movable loading we could use the following four variants of statement of the problem of influence of the movable loading on the elastic structures and buildings [5,8].
Naturally, this kinship also affects the nature of the movements of the objects being studied.
Two-wave processes in the mechanical systems, “Lybid’, Kyiv.Ukraine, (1991), 83-94
Online since: June 2014
Authors: Fabienne Touratier, Christine Boher, Elodie Cabrol, Vanessa Vidal, Farhad Rezai-Aria
This tilt could be responsible of the low friction factor.
In this specific applicative field, studies are essentially focused on the improvement of the hardfacing machining and relationships between deposition process parameters and mechanical properties of the hardfacing coatings [12,13].
For all this tests, friction factor evolution versus time is rather smooth.
The affected friction depths are approximately similar for each wear test and about 350µm.
References [1] Atamert, S.; Bhadeshia, H.K.D.H.: Comparison of the Microstructures and Abrasive Wear Properties of Stellite Hardfacing Alloys Deposited by Arc Welding and Laser Cladding, Metallurgical Transactions A, 1989, 20(6), pp. 1037–1054 [2] De Mol Van Otterloo, J.L.; De Hosson J.TH.
In this specific applicative field, studies are essentially focused on the improvement of the hardfacing machining and relationships between deposition process parameters and mechanical properties of the hardfacing coatings [12,13].
For all this tests, friction factor evolution versus time is rather smooth.
The affected friction depths are approximately similar for each wear test and about 350µm.
References [1] Atamert, S.; Bhadeshia, H.K.D.H.: Comparison of the Microstructures and Abrasive Wear Properties of Stellite Hardfacing Alloys Deposited by Arc Welding and Laser Cladding, Metallurgical Transactions A, 1989, 20(6), pp. 1037–1054 [2] De Mol Van Otterloo, J.L.; De Hosson J.TH.
Online since: October 2023
Authors: Arisara Chaikittiratana, Kerati Suwanpakpraek, Baramee Patamaprohm
The mechanical properties of adhesive for Drucker-Prager model are summarized in Table 2 [15].
Validation of Failure Properties by Simulation of Single Lap Shear Test Single lap shear model.
This simulation is performed to validate the failure properties of adhesive joining.
The steel adherences are assigned an elastic-plastic behavior and the mechanical properties are summarized in Table 1.
Mechanical properties of adhesive layer for the Drucker-Prager model with plastic behavior and ductile damage model for failure behavior are summarized in Table 2 & 3 respectively.
Validation of Failure Properties by Simulation of Single Lap Shear Test Single lap shear model.
This simulation is performed to validate the failure properties of adhesive joining.
The steel adherences are assigned an elastic-plastic behavior and the mechanical properties are summarized in Table 1.
Mechanical properties of adhesive layer for the Drucker-Prager model with plastic behavior and ductile damage model for failure behavior are summarized in Table 2 & 3 respectively.
Online since: October 2004
Authors: Kenichi Ikeda, Fuyuki Yoshida, Masato Uehara, Hideharu Nakashima, Hiroshi Abe
Introduction
The microstructure control using texture has been frequently used to improve the mechanical or
functional properties of metallic material.
The grain boundary migration behavior depends on various factors such as misorientation angle, temperature, driving force, impurity, etc.
where M is the mobility of the grain boundary migration, γg.b. the grain boundary energy and f(α) the magnification factor which is functionally related to the angle α[1, 2].
Further, cumulative anneals were conducted on each specimens, with the mechanical polishing and the annealing to remove the strain introduced by mechanical polishing.
It has been revealed that the migration in grain boundary was strongly affected by impurities in raw materials[5].
The grain boundary migration behavior depends on various factors such as misorientation angle, temperature, driving force, impurity, etc.
where M is the mobility of the grain boundary migration, γg.b. the grain boundary energy and f(α) the magnification factor which is functionally related to the angle α[1, 2].
Further, cumulative anneals were conducted on each specimens, with the mechanical polishing and the annealing to remove the strain introduced by mechanical polishing.
It has been revealed that the migration in grain boundary was strongly affected by impurities in raw materials[5].
Online since: March 2014
Authors: Kang Hua Yan, Chuang Feng Zhao, Zhi Wei Yang, Dong Yu Liu, Bao Rang Li
Introduction
The morphology-controlled synthesis of inorganic oxides has attracted considerable interest because of their unique morphology-dependent properties and applications.
Actually, many factors, such as formation energetics, growth kinetics, as well as environmental condition play an important role in determining the formation mechanism and growth morphology of a particular phase.
These studies related to the synthesis mechanism with controlled Lu2Ti2O7 morphologies would become valuable because the octahedron-shaped Lu2Ti2O7 might have a potential effect upon its physical properties although till now no similar investigations were found to be reported.
From the viewpoints of thermal dynamics, particle morphologies should be strongly affected by lattice energy in crystallites and surface energy of the exposed surface.
This might be another factor which contributes to the reduction of pH sensitivity value.
Actually, many factors, such as formation energetics, growth kinetics, as well as environmental condition play an important role in determining the formation mechanism and growth morphology of a particular phase.
These studies related to the synthesis mechanism with controlled Lu2Ti2O7 morphologies would become valuable because the octahedron-shaped Lu2Ti2O7 might have a potential effect upon its physical properties although till now no similar investigations were found to be reported.
From the viewpoints of thermal dynamics, particle morphologies should be strongly affected by lattice energy in crystallites and surface energy of the exposed surface.
This might be another factor which contributes to the reduction of pH sensitivity value.
Online since: December 2013
Authors: Abd Rahim Abu Bakar, Ahmad Razimi Mat Lazim, Izzat Mohd Asri, Mohd Kameil Abdul Hamid
During braking condition, both rotor and pads are exposed to road environmental particle which may affect pads surface condition.
This is because the nature of brake squeal are mysterious, unpredicted, and often non-repeatable due to its high dependency on a large number of interacting parameters, such as contact conditions, material properties and ever-changing operating conditions [1].
While the squeal pad surface with silica sand particles shows a changing on these particles which are believe to agglomerate at the pad surface known as grit embedment, a factor which contribute to modifying the surface morphologies and wear behaviour of friction surface.
The reduction of squeal level from maximum value of 92 dBA without silica sand particles to 85 dBA had shown that the silica sand particle affected the surface behaviour of pad samples.
Despite the result shows that silica sand significantly affect pad surface during squeal event however this might not demonstrate of full understanding of small particles effect.
This is because the nature of brake squeal are mysterious, unpredicted, and often non-repeatable due to its high dependency on a large number of interacting parameters, such as contact conditions, material properties and ever-changing operating conditions [1].
While the squeal pad surface with silica sand particles shows a changing on these particles which are believe to agglomerate at the pad surface known as grit embedment, a factor which contribute to modifying the surface morphologies and wear behaviour of friction surface.
The reduction of squeal level from maximum value of 92 dBA without silica sand particles to 85 dBA had shown that the silica sand particle affected the surface behaviour of pad samples.
Despite the result shows that silica sand significantly affect pad surface during squeal event however this might not demonstrate of full understanding of small particles effect.
Online since: December 2010
Authors: Pei Yu Yan, Jing Jing Feng, Miao Miao
The impacts of all the factors on RER of moistly-cured mortars are becoming steady when the age is longer than 7days.
Besides the property of expansive agent, the strength evolution of cementitious materials affects expansion as a "self-restraint effect", and the relationship of strength and expansion is very complicated.
Table 1 Chemical composition of materials Table 2 Factors of orthogonal test No.
They gradually become steady after 7d, so we only need to analyze rang of the factors at 7d instead of investigating all ages.
Mehta, Paulo J.M.Monteiro: Concrete, Microstructure, Properties and Materials, United States of America: The McGraw-Hill Companies, Inc. (2006)
Besides the property of expansive agent, the strength evolution of cementitious materials affects expansion as a "self-restraint effect", and the relationship of strength and expansion is very complicated.
Table 1 Chemical composition of materials Table 2 Factors of orthogonal test No.
They gradually become steady after 7d, so we only need to analyze rang of the factors at 7d instead of investigating all ages.
Mehta, Paulo J.M.Monteiro: Concrete, Microstructure, Properties and Materials, United States of America: The McGraw-Hill Companies, Inc. (2006)
Online since: March 2022
Authors: Shu Ing Doh, Siew Choo Chin, Chia Min Ho, Guo Qing Jing, Xiao Feng Li
Fig. 1 World Portland cement production [3]
Utilization of water can influence the properties of fresh and hardened concrete based on the w/c as a basic factor in mix design of mortar and concrete [13], [14].
In order to produce perfect concrete with good workability, mechanical and durability properties, w/c have to be considered carefully.
Nikbin, “A comprehensive study on the effect of water to cement ratio on the mechanical and radiation shielding properties of heavyweight concrete,” Constr.
Ali, “Combined influence of glass powder and granular steel slag on fresh and mechanical properties of self-compacting concrete,” Constr.
Ozbakkaloglu, “Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers,” Constr.
In order to produce perfect concrete with good workability, mechanical and durability properties, w/c have to be considered carefully.
Nikbin, “A comprehensive study on the effect of water to cement ratio on the mechanical and radiation shielding properties of heavyweight concrete,” Constr.
Ali, “Combined influence of glass powder and granular steel slag on fresh and mechanical properties of self-compacting concrete,” Constr.
Ozbakkaloglu, “Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers,” Constr.
Online since: February 2011
Authors: Xin Bai, Jie Jin, Fang Yin Ning
Flow of Finite Element Analysis of Metal Powder in Medal
Injection Mold Runner
Jie Jin 1, a, Xin Bai 2,b, Fangyin Ning3,c
1,2College of Mechanical & Electrical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
abluejinjie@126.com,bbaixin20091985@126.com,cfangyin1001@126.com
Keywords: Metal Powder Injection Molding; Mold Runner; Die Filling; Finite Element Simulation
Abstract: Based on the continuum theory, combined with the characteristics of metal injection molding, constructs assumptions and control equation in the die filling process of MIM.With the FLOTRAN hydro-analysis module of ANSYS software, the melt’s velocity ,temperature and pressure fields during injection molding were simulated and compared for different sizes of circular section runners,and discussed the influences between different diameter runners and injection pressure on the flow behavior of melt.
Because the runners size is usually slightly smaller than the main runner, and the cross section shape and size of runner directly affect the velocity and filling time.
Mathematical model of MIM melt flowing in the channels Basic assumptions and the continuum model In numerical simulation, any physical model could not consider all factors, which should be removed a number of unimportant factors, to simplify model.
Therefore, on different injection conditions, different physical properties of feedstock will inevitably require different injection pressures.
Because the runners size is usually slightly smaller than the main runner, and the cross section shape and size of runner directly affect the velocity and filling time.
Mathematical model of MIM melt flowing in the channels Basic assumptions and the continuum model In numerical simulation, any physical model could not consider all factors, which should be removed a number of unimportant factors, to simplify model.
Therefore, on different injection conditions, different physical properties of feedstock will inevitably require different injection pressures.