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Online since: May 2019
Authors: Maksim Sergeevich Sokolov, Ruslan Aharonovich Abramov, Meir Nisonovich Surilov, Svetlana Vyacheslavovna Derevianko
One of the ways to solve this problem is the use of composite binders (KV), which allows to exclude a number of additives from the composition of the mixtures, as well as to provide the required physical, mechanical and rheological properties along with a decrease in the cement content.
Properties of CDM directly depend on the raw components included in their composition.
Thus, the change in rheological characteristics depends on the Genesis of the quartz component and affects the structural and mechanical properties of mortar mixtures.
The choice of factors and parameters of optimization was made on the basis of technological and economic feasibility.
I. evaluation of the effect of quartz of different origin on the properties of the VNV [Text] / A.I.
Properties of CDM directly depend on the raw components included in their composition.
Thus, the change in rheological characteristics depends on the Genesis of the quartz component and affects the structural and mechanical properties of mortar mixtures.
The choice of factors and parameters of optimization was made on the basis of technological and economic feasibility.
I. evaluation of the effect of quartz of different origin on the properties of the VNV [Text] / A.I.
Online since: June 2011
Authors: Guo Zhe Yang, Hai Bo Lin, Zhe Guang Hu
By analyzing the dynamic and the static properties for the platform with ANSYS software and comparing the designs of platforms, the design of the base motion platform has been completed.
For precision motion platform, the quality of the dynamic properties of the structure is one of the key factors to the processing performance.
Taking into account the importance of the working band of the platform and features of the first few modes, it is better to analyze the frequency of the first order modal and mode which affect the rack.
Because the degree of micro feed is so minute that the precise is affected by the minute vibration of base.
The size of the relative displacement caused by the static deformation of beams seriously affected the accuracy.
For precision motion platform, the quality of the dynamic properties of the structure is one of the key factors to the processing performance.
Taking into account the importance of the working band of the platform and features of the first few modes, it is better to analyze the frequency of the first order modal and mode which affect the rack.
Because the degree of micro feed is so minute that the precise is affected by the minute vibration of base.
The size of the relative displacement caused by the static deformation of beams seriously affected the accuracy.
Online since: December 2013
Authors: Walter Reimers, Vidal Sanabria, Sören Müller
The friction results can be reproduced using a friction factor of m= 0.85 at 300 °C and m= 0.7 at 400 °C.
Additionally, the complex stick-slip effect or intermittent contact behavior takes place in the bearing channel, affecting strongly the final velocity distribution and the product surface.
However, the superficial conditions such as asperity, oxidation layer and hardness also affect this complex phenomenon [7].
If a sticking condition is considered, the friction factor m=1 is assumed.
Molinari, Tribological properties of surface engineering hot work steel for aluminium extrusion dies.
Additionally, the complex stick-slip effect or intermittent contact behavior takes place in the bearing channel, affecting strongly the final velocity distribution and the product surface.
However, the superficial conditions such as asperity, oxidation layer and hardness also affect this complex phenomenon [7].
If a sticking condition is considered, the friction factor m=1 is assumed.
Molinari, Tribological properties of surface engineering hot work steel for aluminium extrusion dies.
Online since: July 2013
Authors: Zhi Yong Li, Li Li, Zong Wei Niu
Because the process of blade in electrochemical machining(EMC) can be effected by many factors, such as blade shapes, machining electrical field, electrolyte fluid field and anode electrochemical dissolution, different ECM machining parameters maybe result in great affections on blade machining accuracy.
Being a non-mechanical metal removal process, ECM is capable of machining any electrically conductive materials with high stock removal rates regardless of their mechanical properties, such as hardness, elasticity and brittleness.
All machining parameters involving electrical field distribution, electrolyte flow field and electrochemical dissolution characteristics may affect the stability of ECM and shape accuracy.
According to the basic principle of ECM, electrolyte conductivity is mainly affected by two factors, electrolyte temperature and electrolyte bubble rate.
If we consider the two factors together, the value of at position along electrolyte flow direction can be impressed as (11) From (6) to (11), is conductivity temperature coefficient; current density; electrolyte density; electrolyte flow rate; specific heat of electrolyte; volumetric electrochemical equivalent of hydrogen gas; correction factor of hydrogen gas; resistance coefficient of electrolyte flow; hydraulic diameter; According to (11), the at position along electrolyte flow direction can be calculated precisely.As mentioned above, the most important EMC process parameters are applied voltage, tool feed rate, electrolyte temperature, electrolyte pressure and ECM initial gap.
Being a non-mechanical metal removal process, ECM is capable of machining any electrically conductive materials with high stock removal rates regardless of their mechanical properties, such as hardness, elasticity and brittleness.
All machining parameters involving electrical field distribution, electrolyte flow field and electrochemical dissolution characteristics may affect the stability of ECM and shape accuracy.
According to the basic principle of ECM, electrolyte conductivity is mainly affected by two factors, electrolyte temperature and electrolyte bubble rate.
If we consider the two factors together, the value of at position along electrolyte flow direction can be impressed as (11) From (6) to (11), is conductivity temperature coefficient; current density; electrolyte density; electrolyte flow rate; specific heat of electrolyte; volumetric electrochemical equivalent of hydrogen gas; correction factor of hydrogen gas; resistance coefficient of electrolyte flow; hydraulic diameter; According to (11), the at position along electrolyte flow direction can be calculated precisely.As mentioned above, the most important EMC process parameters are applied voltage, tool feed rate, electrolyte temperature, electrolyte pressure and ECM initial gap.
Online since: October 2015
Authors: Dan Huang, Wu Zhao, Ying Wang
China, 454000
2 School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, P.
The sensitivities of all kinds of effective factors to the dynamic porosity is analyzed and the order of parameters’ sensitivities to the dynamic porosity of 3D triangle structure is: pressure < temperature < initial porosity < network rod length < network rod radius.
Introduction The current basic components of most ultra-precise machines are made of the traditional casting iron and soldered structural steel, which is characteristic of some good static mechanical properties such as compression and bending strength, nevertheless, the shock-damping performance is up to the limit.
With the continuously development of the high-speed precise and high-effective processing technology, the poor dynamic properties of the casting iron and soldered steel is increasing apparent, and no longer is enough to meet the requirements of high precision, high thermal stability and high shock damping for the modern industrial machines [1].
For the further demand to improve the properties and performances of the precise machine’s components, the evaluation mechanism of shock damping and acoustic absorbing of ceramic material remains to further investigation and discussion. 3D network SiC ceramic with continuous pore structure has good shock damping and absorbing performance.
The sensitivities of all kinds of effective factors to the dynamic porosity is analyzed and the order of parameters’ sensitivities to the dynamic porosity of 3D triangle structure is: pressure < temperature < initial porosity < network rod length < network rod radius.
Introduction The current basic components of most ultra-precise machines are made of the traditional casting iron and soldered structural steel, which is characteristic of some good static mechanical properties such as compression and bending strength, nevertheless, the shock-damping performance is up to the limit.
With the continuously development of the high-speed precise and high-effective processing technology, the poor dynamic properties of the casting iron and soldered steel is increasing apparent, and no longer is enough to meet the requirements of high precision, high thermal stability and high shock damping for the modern industrial machines [1].
For the further demand to improve the properties and performances of the precise machine’s components, the evaluation mechanism of shock damping and acoustic absorbing of ceramic material remains to further investigation and discussion. 3D network SiC ceramic with continuous pore structure has good shock damping and absorbing performance.
Online since: September 2013
Authors: Yue Zhang, Qing Jian Liu, Lu Liu, Wang Tai Yong
For simplification, factors A(t), B(t), C(t) are introduced to represent three matrix variables of basis function , the changing law of A(t), B(t), C(t) are shown in Fig.2(b).
As shown in Fig.2(a), fitting curve with is beyond the control polygon and its basis function factors A,B,C are out the regulation range of [0, 1].
(a)Fitting curves under different parameters (b) Changing law of factors A(t), B(t), C(t) Fig.2 Fitting curves and basis function variables curves under different parameters Fitting curve has the following properties: (1) endpoints property: fitting curve must pass through endpoints P0, P2, when , i.e. and ; (2) symmetry: fitting curves shape the same no matter the control points are P0, P1, P2 or P2, P1, P0 by the law of factors; (3) no-negativity: if the shape parameter ranges from 0 to 2,all values of factors A(t), B(t), C(t) are both positive; (4) weighting property: ; (5) monotonic property: when , factors A(t),C(t) decrease and B(t) increases as the shape parameter increases.(6) convex hull property: from above properties, fitting curve certainly falls within the convex hull formed of its control points.
China Mechanical Engineering. 15 (2012) 1825~1829
China mechanical engineering, 15(15) (2004) 1354~1356
As shown in Fig.2(a), fitting curve with is beyond the control polygon and its basis function factors A,B,C are out the regulation range of [0, 1].
(a)Fitting curves under different parameters (b) Changing law of factors A(t), B(t), C(t) Fig.2 Fitting curves and basis function variables curves under different parameters Fitting curve has the following properties: (1) endpoints property: fitting curve must pass through endpoints P0, P2, when , i.e. and ; (2) symmetry: fitting curves shape the same no matter the control points are P0, P1, P2 or P2, P1, P0 by the law of factors; (3) no-negativity: if the shape parameter ranges from 0 to 2,all values of factors A(t), B(t), C(t) are both positive; (4) weighting property: ; (5) monotonic property: when , factors A(t),C(t) decrease and B(t) increases as the shape parameter increases.(6) convex hull property: from above properties, fitting curve certainly falls within the convex hull formed of its control points.
China Mechanical Engineering. 15 (2012) 1825~1829
China mechanical engineering, 15(15) (2004) 1354~1356
Online since: June 2025
Authors: Abdul Rahim Al Umairi, Hamed Al Kindi
These materials enhance mechanical properties, improve durability, and reduce environmental impact.
The rough surfaces of the particles can be observed, showcasing pores and microfissures that influence the cement's mechanical properties and hydration kinetics.
This might explain better mechnanical properties of this sample.
The SEM also show agglomeration of smaller particles into larger clusters, which can influence the packing and mechanical properties of the final composite material even when MW combined with CC Fig. 5-d&e.
Properties of ash generated during sewage sludge combustion: A multifaceted analysis.
The rough surfaces of the particles can be observed, showcasing pores and microfissures that influence the cement's mechanical properties and hydration kinetics.
This might explain better mechnanical properties of this sample.
The SEM also show agglomeration of smaller particles into larger clusters, which can influence the packing and mechanical properties of the final composite material even when MW combined with CC Fig. 5-d&e.
Properties of ash generated during sewage sludge combustion: A multifaceted analysis.
Online since: June 2008
Authors: Yuri Estrin, Ming Xing Zhang, Christopher op’t Hoog, Nick Birbilis
Such deterioration / failure modes are hence surface properties sensitive.
The SMAT results, particularly for the as-SMAT samples indicate that a factor other than grain size may be influencing corrosion initiation properties.
The distinct separation in corrosion behaviour of the ECAP specimens, despite having grain sizes only marginally smaller than those of the heat treated CAST and SMAT specimens, indicates that grain size may not be the only factor in tailoring corrosion properties through thermo-mechanical processing.
This speaks significantly to the utility of the effect of grain size and processing treatment to be a key factor in tailoring the corrosion properties of a metal / alloy.
This finding opens up interesting new avenues for improving corrosion properties of Mg by ECAP while at the same time enhancing its mechanical properties
The SMAT results, particularly for the as-SMAT samples indicate that a factor other than grain size may be influencing corrosion initiation properties.
The distinct separation in corrosion behaviour of the ECAP specimens, despite having grain sizes only marginally smaller than those of the heat treated CAST and SMAT specimens, indicates that grain size may not be the only factor in tailoring corrosion properties through thermo-mechanical processing.
This speaks significantly to the utility of the effect of grain size and processing treatment to be a key factor in tailoring the corrosion properties of a metal / alloy.
This finding opens up interesting new avenues for improving corrosion properties of Mg by ECAP while at the same time enhancing its mechanical properties
Online since: October 2016
Authors: Akhil S. Karun, Freddie L. Inambao, Williams S. Ebhota
The effects of erosion on turbine depends on certain water and turbine material factors.
Wear resistance and other mechanical properties are function of the hardness of the second phase particles in the matrix [20, 21].
The mechanical properties of aluminium–silicon alloys are often improved by casting technology [23].
These morphological features need to be refined and modified for the alloy to possess better mechanical properties.
Gruzleski:, "Mechanical Properties of A356.0 Alloys Modified with Pure Strontium " American Foundry Society Transaction, pp. 453-464, 1982
Wear resistance and other mechanical properties are function of the hardness of the second phase particles in the matrix [20, 21].
The mechanical properties of aluminium–silicon alloys are often improved by casting technology [23].
These morphological features need to be refined and modified for the alloy to possess better mechanical properties.
Gruzleski:, "Mechanical Properties of A356.0 Alloys Modified with Pure Strontium " American Foundry Society Transaction, pp. 453-464, 1982
SPS Temperature Influence on the Composition, Structure and Magnetic Properties of Hematite Ceramics
Online since: September 2021
Authors: Alexander S. Samardak, Evgeniy Papynov, Alexey Ognev, Vladimir Pechnikov
The cumulative effect of these factors has a direct impact on the physicochemical characteristics of the sintered materials.
So, for example, in the case of the synthesis of magnetic materials, the change in their composition and structure, which easily occurs during heat treatment, is a critical factor determining their magnetic properties [23, 24] In addition, additional superposition of the electromagnetic field can affect the anisotropy of the system, setting the ordering of the magnetization during sintering.
Effect of SPS process sintering on the microstructure and mechanical properties of nanocrystalline TiC for tools application.
Magnetic properties of hard (CoFe2O4)-soft (Fe3O4) composite ceramics.
Influence of Crystallite Size on the Magnetic Properties of Acicular γ‐Fe2O3Particles.
So, for example, in the case of the synthesis of magnetic materials, the change in their composition and structure, which easily occurs during heat treatment, is a critical factor determining their magnetic properties [23, 24] In addition, additional superposition of the electromagnetic field can affect the anisotropy of the system, setting the ordering of the magnetization during sintering.
Effect of SPS process sintering on the microstructure and mechanical properties of nanocrystalline TiC for tools application.
Magnetic properties of hard (CoFe2O4)-soft (Fe3O4) composite ceramics.
Influence of Crystallite Size on the Magnetic Properties of Acicular γ‐Fe2O3Particles.