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Online since: May 2020
Authors: Xiao Wei Cheng, You Cheng Zheng, You Zhi Zheng, Tao Gu, Hong Wei Xia, Xiao Yang Guo
As a result of formation and precipitation of calcium carbonate, permeability and porosity of cement paste will be decreased and mechanical properties can be improved significantly [13-15].
Thus, the transport property of cement is usually regarded as one of the most important factors that impact the carbonation rate of cement.
Effects of Sulfate during CO2 Attack on Portland Cement and Their Impacts on Mechanical Properties under Geologic CO2 Sequestration Conditions.
Zonal Isolation Assurance: Relating Cement Mechanical Properties to Mechanical Durability.
Chemical reactions of Portland cement with aqueous CO2 and their impacts on cement’s mechanical properties under geologic CO2 sequestration conditions.
Thus, the transport property of cement is usually regarded as one of the most important factors that impact the carbonation rate of cement.
Effects of Sulfate during CO2 Attack on Portland Cement and Their Impacts on Mechanical Properties under Geologic CO2 Sequestration Conditions.
Zonal Isolation Assurance: Relating Cement Mechanical Properties to Mechanical Durability.
Chemical reactions of Portland cement with aqueous CO2 and their impacts on cement’s mechanical properties under geologic CO2 sequestration conditions.
Online since: November 2005
Authors: Gwang Hee Heo, Giu Lee, Man Yong Choi, Hyun Do Yun, Myoung Won Lee
One of the main problems for this system design is to measure long-time dynamic response signals
and simultaneously estimate the structural dynamic properties.
In general, damage identification methods for structural health monitoring involve the structural dynamic properties.
Dynamic properties, such as natural frequencies, damping coefficients and mode shape, are directly related with structural stiffness or mass matrix.
To provide a common base of reference for the before and after damage cases, the eigen-values are used as normalization factors for the eigen-vectors.
Structural damages affect all three modes; especially, the first mode is dropped into 0.976.
In general, damage identification methods for structural health monitoring involve the structural dynamic properties.
Dynamic properties, such as natural frequencies, damping coefficients and mode shape, are directly related with structural stiffness or mass matrix.
To provide a common base of reference for the before and after damage cases, the eigen-values are used as normalization factors for the eigen-vectors.
Structural damages affect all three modes; especially, the first mode is dropped into 0.976.
Online since: October 2010
Authors: Jiang Hong Cui, Jian Ru Shi, Jian Fei Chen
Influencing Factor to Super-precision Grinding Quality and Productivity.
The properties of abrasive influence directly the machining accuracy of mechanical product and surface roughness.
Considering synthetically the factors of work materials, abrasive grain and grinding manners and so on, we selected the higher concentration value of 100%, and the hardness of the slipstone is of J-K (soft 3 - in soft).
The size of metamorphic layer on workpiece surface affects seriously the anti-corruptibility and service life of the part [6-7].
Jin: Frontiers of Mechanical Engineering in China Vol.2 (2007), p. 65 [3] E.N.
The properties of abrasive influence directly the machining accuracy of mechanical product and surface roughness.
Considering synthetically the factors of work materials, abrasive grain and grinding manners and so on, we selected the higher concentration value of 100%, and the hardness of the slipstone is of J-K (soft 3 - in soft).
The size of metamorphic layer on workpiece surface affects seriously the anti-corruptibility and service life of the part [6-7].
Jin: Frontiers of Mechanical Engineering in China Vol.2 (2007), p. 65 [3] E.N.
Online since: August 2007
Authors: E.M. Anawa, Abdul Ghani Olabi
The internal state of stress is caused by thermal and/or mechanical processing of the parts.
The obtained results from Taguchi method are insensitive to the variation of environmental conditions and other noise factors.
The typical chemical compositions of the received materials and the mechanical properties are shown in Table 2 and Table 3 respectivaly.
The final mathematical model in terms of actual factors as determined by design expert software is shown below.
iv) The focusing position parameter has an insignificant effect on the residual stresses. v) The model developed can be adequately predicting the responses within the factors domain.
The obtained results from Taguchi method are insensitive to the variation of environmental conditions and other noise factors.
The typical chemical compositions of the received materials and the mechanical properties are shown in Table 2 and Table 3 respectivaly.
The final mathematical model in terms of actual factors as determined by design expert software is shown below.
iv) The focusing position parameter has an insignificant effect on the residual stresses. v) The model developed can be adequately predicting the responses within the factors domain.
Online since: June 2008
Authors: Matthias Göken, Heinz Werner Höppel, Johannes May
Introduction
It is well known, that ultrafine-grained (UFG) materials exhibit superior mechanical properties
under monotonic loading conditions, compared to conventional grain-sized (CG) materials.
But also under cyclic loading conditions the UFG microstructure strongly improves the mechanical properties.
For an optimization of the fatigue properties of UFG metals it is essential to achieve a stable UFG microstructure which is insusceptible to cyclic softening.
In addition to the number of ECAP passes, the amount of alloying elements also strongly influences the fatigue properties and cyclic stability of UFG materials.
Höppel, in: Structure and mechanical properties of nanophase materials - theory and computer simulation vs. experiment, edited by D.
But also under cyclic loading conditions the UFG microstructure strongly improves the mechanical properties.
For an optimization of the fatigue properties of UFG metals it is essential to achieve a stable UFG microstructure which is insusceptible to cyclic softening.
In addition to the number of ECAP passes, the amount of alloying elements also strongly influences the fatigue properties and cyclic stability of UFG materials.
Höppel, in: Structure and mechanical properties of nanophase materials - theory and computer simulation vs. experiment, edited by D.
Online since: July 2014
Authors: Abdel Hamid I. Mourad, Mohammad Sayem Mozumder, Jesse Zhu, Hiran Perinpanayagam
Surface properties, such as surface roughness, surface chemistry, and topography of the implants [12-17], influence the initial cell response at the cell–material interphase, ultimately affecting the rate and quality of the newly formed tissue [30].
However, coatings’ adhesion (to the substrate) and thermal properties might also have affected the cellular response since some of our formulations contained PTFE.
Thermal Properties of the Coatings.
Kiamanesh, The effect of micro and nano-sized particles on mechanical and adhesion properties of a clear polyester powder coating, Prog.
Barton, UV irradiation and aging effects on nanoscale mechanical properties of ultrahigh molecular weight polyethylene for biomedical implants, Plast.
However, coatings’ adhesion (to the substrate) and thermal properties might also have affected the cellular response since some of our formulations contained PTFE.
Thermal Properties of the Coatings.
Kiamanesh, The effect of micro and nano-sized particles on mechanical and adhesion properties of a clear polyester powder coating, Prog.
Barton, UV irradiation and aging effects on nanoscale mechanical properties of ultrahigh molecular weight polyethylene for biomedical implants, Plast.
Online since: August 2014
Authors: Dai Okumura, Shuhei Banno, Nobutada Ohno
It is found that the mean pore pressure entirely affect the homogenized viscoplastic behavior.
It was found using three special cases derived from Hill’s macrohomogeneity equation, that one of , or (the mean of and ) entirely affects the homogenized viscoplastic behavior in the steady state.
In a small case of the strain-rate sensitivity of base metals, and almost entirely affected the homogenized viscoplastic behavior under uniaxial tension and compression, respectively, while in a moderate case of the strain-rate sensitivity, nearly entirely affected the homogenized viscoplastic behavior.
Microscopic material properties Fig. 2 shows a plate-fin, periodic unit cell consisting of a solid region and two open-pore regions and .
Incidentally, buckling of plates and fins is not considered in accordance with the assumption of small deformation in this study, although buckling is an important factor for cellular solids subjected to compression at large strains [7,8].
It was found using three special cases derived from Hill’s macrohomogeneity equation, that one of , or (the mean of and ) entirely affects the homogenized viscoplastic behavior in the steady state.
In a small case of the strain-rate sensitivity of base metals, and almost entirely affected the homogenized viscoplastic behavior under uniaxial tension and compression, respectively, while in a moderate case of the strain-rate sensitivity, nearly entirely affected the homogenized viscoplastic behavior.
Microscopic material properties Fig. 2 shows a plate-fin, periodic unit cell consisting of a solid region and two open-pore regions and .
Incidentally, buckling of plates and fins is not considered in accordance with the assumption of small deformation in this study, although buckling is an important factor for cellular solids subjected to compression at large strains [7,8].
Online since: April 2007
Authors: Zhi Peng Xie, Hua Tao Wang, Wei You Yang, Li Nan An, Guo Quan Liu
Introduction
SiCN is a new class polymer-derived ceramics with excellent thermal and mechanical properties,
which are amorphous alloys of silicon, carbon and nitrogen.
Higher heating rates would result in the production of most of the gaseous by-products at a narrow temperature range (H2 at 600-700 ºC, and CH4 at 600 ºC), which could generate defects in the pyrolyzed sample and degrade the mechanical strength of the structures [6].
The factors affected the shape of the slope walls were attributed to the thickness of the sample, the photo initiator and the mask-to-lamp distance [7].
Higher heating rates would result in the production of most of the gaseous by-products at a narrow temperature range (H2 at 600-700 ºC, and CH4 at 600 ºC), which could generate defects in the pyrolyzed sample and degrade the mechanical strength of the structures [6].
The factors affected the shape of the slope walls were attributed to the thickness of the sample, the photo initiator and the mask-to-lamp distance [7].
Online since: December 2012
Authors: Marcel Behún, Anton Panda, Jozef Jurko
Fixture for the cutting tool: high precision hydraulic clamping head, the workpiece fixture: mechanical vise.
Due to deformation and heat, which is always part of the cutting process, stress is generated on this layer and changes its physical and mechanical properties.
The set of properties that define the state of the surface after cutting is referred to as technological inheritance, which makes up the future operating features, i.e. forms the surface functionality [7].
The surface after the cut is the part of the object's surface created by the cutting process and is the carried and creator of the functional properties of the surface, figure 2.
The wear and deviation of the spindle can affect the accuracy of production, · the proper production and removal of chips must always be ensured.
Due to deformation and heat, which is always part of the cutting process, stress is generated on this layer and changes its physical and mechanical properties.
The set of properties that define the state of the surface after cutting is referred to as technological inheritance, which makes up the future operating features, i.e. forms the surface functionality [7].
The surface after the cut is the part of the object's surface created by the cutting process and is the carried and creator of the functional properties of the surface, figure 2.
The wear and deviation of the spindle can affect the accuracy of production, · the proper production and removal of chips must always be ensured.
Online since: March 2010
Authors: Chun Li Jia, Jian Ping Wang, Jun Wang, Zhi Jie Jiao, Zhong Zhao
During the
thermo-mechanical rolling process, the strain of last pass can't be fully reversed because of the
influence of the alloying elements (especially �b).
(12) The average temperature of last pass and the pass interval time and the composition of �b are the main factors which affect the residual strain.
The deformation zone shape affects the stress state of plate.
The ratios of the actual measured rolling force values and the calculation values of rolling force model are used as correction factors during the rolling process.
The exponential smoothing method [10,11] is used to gain parameter, as follows: Aiming at each thickness layer, the correction factors k[0],k[1],…,k[19] of the most recent 20 passes, of which the average thicknesseses are in the corresponding thickness layer according to the time rolled from near to far, are found. β is used as weight-based model parameter.
(12) The average temperature of last pass and the pass interval time and the composition of �b are the main factors which affect the residual strain.
The deformation zone shape affects the stress state of plate.
The ratios of the actual measured rolling force values and the calculation values of rolling force model are used as correction factors during the rolling process.
The exponential smoothing method [10,11] is used to gain parameter, as follows: Aiming at each thickness layer, the correction factors k[0],k[1],…,k[19] of the most recent 20 passes, of which the average thicknesseses are in the corresponding thickness layer according to the time rolled from near to far, are found. β is used as weight-based model parameter.