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Molecular Dynamics Simulation for Nanohardness Experiments Based on Single Crystal Silicon Substrate
Online since: March 2004
Authors: Ying Xue Yao, Yu Zhu
The
research provides a new method to analyze the relations among the properties of material mechanics
on nano scale and establishes a base to further study on the method of assessing residual stress
through measuring hardness value.
Mechanical property of material is studied using molecular dynamic method from then on.
The affecting mechanics is explained and new method of measuring residual stress is introduced.
But this difference didnt affect the qualitative research of molecular dynamics simulation.
In this paper, the relation between the two factors is studied on nano scale.
Mechanical property of material is studied using molecular dynamic method from then on.
The affecting mechanics is explained and new method of measuring residual stress is introduced.
But this difference didnt affect the qualitative research of molecular dynamics simulation.
In this paper, the relation between the two factors is studied on nano scale.
Online since: January 2010
Authors: Kei Shinozuka, Hisao Esaka, M. Tamura, Hiroyasu Tanigawa
Accordingly, although dynamic recovery occurred in the ODS steel, it had not affected
the creep deformation rate.
Oxide dispersion strengthened (ODS) steels are promising candidate for high temperature materials of a nuclear fusion reactor because of excellent mechanical properties.
Although ferritic ODS steels are excellent in creep properties compared with martensitic ODS steels, the anisotropy of the mechanical properties in correlation with rolling or extrusion is large.
However, since the decrease in dislocation density is the main factor of dynamic recovery in usual martensitic heat resistant steel, detailed analysis of the dislocation density during creep deformation is required.
Consequently, dynamic recovery did not affect the creep deformation rate, though it did occur during creep test.
Oxide dispersion strengthened (ODS) steels are promising candidate for high temperature materials of a nuclear fusion reactor because of excellent mechanical properties.
Although ferritic ODS steels are excellent in creep properties compared with martensitic ODS steels, the anisotropy of the mechanical properties in correlation with rolling or extrusion is large.
However, since the decrease in dislocation density is the main factor of dynamic recovery in usual martensitic heat resistant steel, detailed analysis of the dislocation density during creep deformation is required.
Consequently, dynamic recovery did not affect the creep deformation rate, though it did occur during creep test.
Online since: May 2012
Authors: Shi Bin Geng, Ming Xing Xiao
Mixed factor model regard indoor contaminant diffusion as variable, make up the limitation of constant indoor contaminants.
For the different source and several properties of indoor contaminants, and different indoor temperature, humidity, heat, and ventilation, if we analysis indoor and outdoor contaminants relationship, we should further choose proper mathematical model in some cases.
Mixed factor m.In the ideal case, the contaminant concentration of the whole room is consistent, at this time m=1, this assumption can’t be used in most cases, indoor and outdoor air mix is affected by numerous factors, such as air current, indoor temperature, contamination, room volume and so on.
Natural ventilation volume with windows closed: to those rooms of no air conditions, with the effect of pressure differential between indoor and outdoor, there is little natural permeable ventilation through door aperture and wall aperture, it is affected by several factors, such as tightness of windows, outdoor air rate, air direction and so on.
There are numerous factors that affect filters efficiency, such as particle diameter, fibre diameter inside filters, packing ratio, filters medium thickness, and filtration speed and so on.
For the different source and several properties of indoor contaminants, and different indoor temperature, humidity, heat, and ventilation, if we analysis indoor and outdoor contaminants relationship, we should further choose proper mathematical model in some cases.
Mixed factor m.In the ideal case, the contaminant concentration of the whole room is consistent, at this time m=1, this assumption can’t be used in most cases, indoor and outdoor air mix is affected by numerous factors, such as air current, indoor temperature, contamination, room volume and so on.
Natural ventilation volume with windows closed: to those rooms of no air conditions, with the effect of pressure differential between indoor and outdoor, there is little natural permeable ventilation through door aperture and wall aperture, it is affected by several factors, such as tightness of windows, outdoor air rate, air direction and so on.
There are numerous factors that affect filters efficiency, such as particle diameter, fibre diameter inside filters, packing ratio, filters medium thickness, and filtration speed and so on.
Online since: May 2021
Authors: Nuryono Nuryono, Yuichi Kamiya, Sutarno Sutarno, Ahmad Bikharudin
The peak intensity associated with CaO is due to the HNO3 used as a catalyst in the sol-gel process affecting the intensity of the peak CaO [9].
C3S is hydrated more slowly than C3S, therefore the mechanical properties of MTA may take several days to reach the maximum limit.
The release of calcium ions depends on several factors, such as the shape of the structure and mineral particles in a material.
Mala, Mineral Trioxide Aggregate: A Review of Physical Properties, Compend.
Part I: Physical Properties, Dig.
C3S is hydrated more slowly than C3S, therefore the mechanical properties of MTA may take several days to reach the maximum limit.
The release of calcium ions depends on several factors, such as the shape of the structure and mineral particles in a material.
Mala, Mineral Trioxide Aggregate: A Review of Physical Properties, Compend.
Part I: Physical Properties, Dig.
Online since: October 2011
Authors: Qin He Zhang, Ming Liu, Li Ying Gao
Orthogonal Cutting of Biological Soft Tissue with Single Cutting Edge
Liying Gao1,a, Qinhe Zhang2,b, Ming Liu3,c
1, 2, 3 School of Mechanical Engineering, Shandong University, Jinan, China
a gaoliying2008@126.com, b zhangqh@sdu.edu.cn, c 0102liu@163.com
Keywords: Orthogonal cutting; Soft tissue; Cutting force; Force model; Blade
Abstract.
It is well known that the cutting force is dependent on many factors, including material property, cutting tool geometry, and cutting parameter etc.
(5) From the above equation,soft tissue cutting force is affected by elasticity force, frictional force, and released force due to tissue fracture.
The frictional force is dependent on both contact area and friction property of the friction pair.
[5] Schwartz, J.M., et al., Modelling liver tissue properties using a non-linear visco-elastic model for surgery simulation.
It is well known that the cutting force is dependent on many factors, including material property, cutting tool geometry, and cutting parameter etc.
(5) From the above equation,soft tissue cutting force is affected by elasticity force, frictional force, and released force due to tissue fracture.
The frictional force is dependent on both contact area and friction property of the friction pair.
[5] Schwartz, J.M., et al., Modelling liver tissue properties using a non-linear visco-elastic model for surgery simulation.
Online since: January 2014
Authors: Han Min Zhou, Xiao Fei Liu
Tailings disposal methods are affected by the topographic and geologic conditions, physical and mechanical properties of tailings, the state environmental control standards and many other factors.
And mold bag full of consolidated tailings has more superior mechanical strength than tailings dam formed through natural consolidation.
Downstream construction, mechanical placing and compaction were well developed on the basis of technology accumulation from the last three generations.
(2)Thickened tailings method is suitable or not for a mining is mostly impacted by the site specific factors.
And mold bag full of consolidated tailings has more superior mechanical strength than tailings dam formed through natural consolidation.
Downstream construction, mechanical placing and compaction were well developed on the basis of technology accumulation from the last three generations.
(2)Thickened tailings method is suitable or not for a mining is mostly impacted by the site specific factors.
Properties of Foam and Soil Improvements for Earth-Pressure Balance Shield Construction in Red Soils
Online since: May 2011
Authors: Tao Li, Bo Liu, Yan Li, Chang Jun Song
Concerned with both own properties of foam and mechanical properties of foamed soil, and combined with the principle of EPB shield construction, Zhu (2004) and Qin (2004) evaluated measures and corresponding index of the foam in shield tunneling construction, and these results could provide practical information for the application and selection of foam technology in EPB shield [6,9].
Luo (1995) obtained the physical and mechanical properties of the chemical improved swelling soil [8].
The properties of the three foams can be obtained in this paper.
The effect factors to foam concentration are mainly manifested in two aspects.
Red soil microstructure and its foam-modified properties for metro shield tunneling engineering in Southern China.
Luo (1995) obtained the physical and mechanical properties of the chemical improved swelling soil [8].
The properties of the three foams can be obtained in this paper.
The effect factors to foam concentration are mainly manifested in two aspects.
Red soil microstructure and its foam-modified properties for metro shield tunneling engineering in Southern China.
Online since: March 2020
Authors: Wei Tian, Yong Mei Qian, Phaaroe Pherekhong Alphonci, Ting Ting Zhou
Second, in the theoretical study on the factors affecting concrete expansion pile under the action of horizontal force, scholars have more studied disk position and have less research on disk spacing factor.
The relevant physical and mechanical properties are shown in Table 1.
Table 1 Physical and mechanical properties of different materials Parameter Material Modulus of elasticity [MPa] Poisson's ratio [υ] Density [kg/mm³] Cohesion [kPa] Friction angle Φ [°] Expansion angle Β [°] Pile-soil friction coefficient Concrete 3.1E+04 0.30 2.6E-6 -- -- -- -- Clay 26 0.165 2.1E-6 17.5 18.27 18.27 0.41 2.4 Model parameters According to the specifications and the requirements for pile size in actual projects, the size of the model pile should be designed in a 1:1 ratio[8].
References [1] Yongmei Qian,Rongzheng Zhai,Ruozhu Wang,Analysis of Soil Characteristics Affecting Failure Behavior and Bearing Capacity of the Concrete Expanded-Plates Pile,The Open Construction and Building Technology Journal, Vols.9, 2015.9:188-191
The Research on the Affect of Collapse State and Bearing Capacity of the Soil Layer Properties Adjacent to the Bearing Plate of the Multi-Extruded-Expanded-Plates Pile[J].
The relevant physical and mechanical properties are shown in Table 1.
Table 1 Physical and mechanical properties of different materials Parameter Material Modulus of elasticity [MPa] Poisson's ratio [υ] Density [kg/mm³] Cohesion [kPa] Friction angle Φ [°] Expansion angle Β [°] Pile-soil friction coefficient Concrete 3.1E+04 0.30 2.6E-6 -- -- -- -- Clay 26 0.165 2.1E-6 17.5 18.27 18.27 0.41 2.4 Model parameters According to the specifications and the requirements for pile size in actual projects, the size of the model pile should be designed in a 1:1 ratio[8].
References [1] Yongmei Qian,Rongzheng Zhai,Ruozhu Wang,Analysis of Soil Characteristics Affecting Failure Behavior and Bearing Capacity of the Concrete Expanded-Plates Pile,The Open Construction and Building Technology Journal, Vols.9, 2015.9:188-191
The Research on the Affect of Collapse State and Bearing Capacity of the Soil Layer Properties Adjacent to the Bearing Plate of the Multi-Extruded-Expanded-Plates Pile[J].
Online since: August 2004
Authors: Myung Ho Song, Jeong Ho Lee, Young Kil Shin
However,
differential signals are processed to eliminate common factors of the two coil's impedance so that
signal interpretation is not straightforward.
Eddy current density and its distribution are dependent on the existence of anomalies and material properties of the test object.
In addition to defect inspection, it can be used to indirectly measure mechanical and metallurgical properties that correlate with electrical properties.
But, the prediction and interpretation of differential signals are not easy because they are processed to eliminate common factors of the two coils [5].
The displacement of operating point is closely related to the properties of test object and the operating conditions.
Eddy current density and its distribution are dependent on the existence of anomalies and material properties of the test object.
In addition to defect inspection, it can be used to indirectly measure mechanical and metallurgical properties that correlate with electrical properties.
But, the prediction and interpretation of differential signals are not easy because they are processed to eliminate common factors of the two coils [5].
The displacement of operating point is closely related to the properties of test object and the operating conditions.
Online since: November 2005
Authors: Chun An Tang, Shu Hong Wang, Xu Chang, Juan Xia Zhang, Wancheng Zu, Wen Zhao, Junjie Liu
There are
many factors affect the RC cracking, including member geometry, loading, variability in concrete
properties, volumetric changes in the concrete, amount and distribution of the reinforcement, and
bonding between the concrete and reinforcement [1].
All these factors make it complicated to predict the crack location and direction and they are also of primary importance for the accurate description of the physical behaviors of RC structures.
The detailed descriptions about the Weilbull distribution of material properties and constitutive law of MFPA 2D have been given in [13].
The reinforcement and concrete are partitioned into a set of elements with same size and different mechanical characteristics in order to reflect the heterogeneous mechanical properties in the material.
The material properties for the concrete and steel reinforcement are adopted from experimental data [8, 11], and the bond interfacial properties described in the previous section.
All these factors make it complicated to predict the crack location and direction and they are also of primary importance for the accurate description of the physical behaviors of RC structures.
The detailed descriptions about the Weilbull distribution of material properties and constitutive law of MFPA 2D have been given in [13].
The reinforcement and concrete are partitioned into a set of elements with same size and different mechanical characteristics in order to reflect the heterogeneous mechanical properties in the material.
The material properties for the concrete and steel reinforcement are adopted from experimental data [8, 11], and the bond interfacial properties described in the previous section.