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Online since: November 2012
Authors: Jian Hua Zhang, Tao Wang, Shi Mei Hao, Xiu Hua Ren
Aggregate is one of the key components in RMC to bear loads, its gradation design determines the overall mechanical properties of the composite directly.
How to minimize vibration during manufacturing process is now an important factor that affects machining precision.
Compared to cast iron and steel, RMC has ten times the vibration alleviating properties, which is suitable for machine tool bed.
As one of the key components in RMC to bear loads, the dosage of aggregate can be more than 85% of the total weight, its own mineralogy performance and skeleton structure corresponding to different aggregate gradation influence the mechanical properties of the composite directly.
Simulation of porosity In order to highlight the issue of aggregate gradation, some complicated factors originating from the heterogeneous property are minimized.
How to minimize vibration during manufacturing process is now an important factor that affects machining precision.
Compared to cast iron and steel, RMC has ten times the vibration alleviating properties, which is suitable for machine tool bed.
As one of the key components in RMC to bear loads, the dosage of aggregate can be more than 85% of the total weight, its own mineralogy performance and skeleton structure corresponding to different aggregate gradation influence the mechanical properties of the composite directly.
Simulation of porosity In order to highlight the issue of aggregate gradation, some complicated factors originating from the heterogeneous property are minimized.
Online since: May 2020
Authors: E.Yu. Gornostaeva, D.I. Dryazgov, N.P. Lukutsova
Improvement of Wood-Cement Composition Properties with Microsilica Additive
E.Yu.
Two interrelated factors (chemical and physical) could be distinguished at that.
The degree of influence of these aggregates on the structure formation and physico-mechanical WCC properties is different.
Results and Discussion The mechanical properties of cement wood depend on a number of factors [1].
Two interrelated factors (chemical and physical) could be distinguished at that.
Two interrelated factors (chemical and physical) could be distinguished at that.
The degree of influence of these aggregates on the structure formation and physico-mechanical WCC properties is different.
Results and Discussion The mechanical properties of cement wood depend on a number of factors [1].
Two interrelated factors (chemical and physical) could be distinguished at that.
Online since: February 2013
Authors: Wojciech Jurczak
Mechanical properties of the welded joints made from different kinds of binder have been determined.
A contact of those materials with air or other corrosive factors causes deterioration of their strength properties and as a result material degradation.
Each type of welding process results in a decrease (approx. 30¸60%) in mechanical properties of welded material.
In the process of welding, the mechanical properties of those alloys in the heat-affected-zone (HAZ) are reduced to the level of the soft material.
This insulating layer of oxide must have the appropriate mechanical and physical properties.
A contact of those materials with air or other corrosive factors causes deterioration of their strength properties and as a result material degradation.
Each type of welding process results in a decrease (approx. 30¸60%) in mechanical properties of welded material.
In the process of welding, the mechanical properties of those alloys in the heat-affected-zone (HAZ) are reduced to the level of the soft material.
This insulating layer of oxide must have the appropriate mechanical and physical properties.
Online since: February 2015
Authors: Zsolt Lukács, Miklós Tisza, Antal Kiss, Gaszton Gál, Péter Zoltán Kovács
In this paper, a new formability testing system introduced developed at the Institute of Materials Sciences and Technology (formerly the Department of Mechanical Technology) at the University of Miskolc.
We can classify the affecting parameters according to several points of view.
The most significant parameters are summarized below: · on of the most important parameter effecting the forming limits is the so-called deformation history, i.e. the strain path; · further significant parameters are the material characteristics: the material quality, the mechanical properties, the anisotropy factor, the hardening exponent and the strain-rate exponent; · the aging phenomena, the rolling process ratio and the effect of the scattering of material parameters, may also have significant effects, · the sheet thickness is a very important issue as in general in formability, · the effect of the workpiece shape and the applied measurement methods, · the test circumstances (i.e. the type of the applied gridding, its size, its accuracy, the measuring mode of the grid shape changing, its accuracy, the friction, the lubrication conditions, the temperature, the effect of the investigation methods, etc.).
DP600, DP800, DP1000 forming limit diagram of high strength steels for t = 1 mm wall thickness By using the determined anisotropy factors from sheet tensile test results, we can determine the expected fracture locations of the star-shaped pieces by modeling, too.
We found from the simulation and experimental results (not detailed completely here), that the change of the anisotropy factors according to the directions has also effect on the fracture sequence of legs.
We can classify the affecting parameters according to several points of view.
The most significant parameters are summarized below: · on of the most important parameter effecting the forming limits is the so-called deformation history, i.e. the strain path; · further significant parameters are the material characteristics: the material quality, the mechanical properties, the anisotropy factor, the hardening exponent and the strain-rate exponent; · the aging phenomena, the rolling process ratio and the effect of the scattering of material parameters, may also have significant effects, · the sheet thickness is a very important issue as in general in formability, · the effect of the workpiece shape and the applied measurement methods, · the test circumstances (i.e. the type of the applied gridding, its size, its accuracy, the measuring mode of the grid shape changing, its accuracy, the friction, the lubrication conditions, the temperature, the effect of the investigation methods, etc.).
DP600, DP800, DP1000 forming limit diagram of high strength steels for t = 1 mm wall thickness By using the determined anisotropy factors from sheet tensile test results, we can determine the expected fracture locations of the star-shaped pieces by modeling, too.
We found from the simulation and experimental results (not detailed completely here), that the change of the anisotropy factors according to the directions has also effect on the fracture sequence of legs.
Online since: July 2015
Authors: Philippe Boisse, Nahiene Hamila, Biao Liang
The measured bending properties are used to simulate a thermoforming process.
Therefore, the mechanical properties must be known at a range of manufacturing temperatures.
The tensile and in-plane shear behaviors are the two most important mechanical properties in the thermoforming.
The tensile properties can be measured from biaxial tests.
The in-plane properties are those given in [4].The bending properties are the values obtained with bending test method mentioned in this paper.
Therefore, the mechanical properties must be known at a range of manufacturing temperatures.
The tensile and in-plane shear behaviors are the two most important mechanical properties in the thermoforming.
The tensile properties can be measured from biaxial tests.
The in-plane properties are those given in [4].The bending properties are the values obtained with bending test method mentioned in this paper.
Online since: October 2012
Authors: Meng Shu Wang, Ding Li Zhang, Zhen Hai Wei
Abstract: The macroscopic static analysis of granule system performance in Literature [1] considered the position, direction and scale of the connection between granules in the system and other relevant physical properties.
That is to say, all factors affect of the end displacement of connectors will affect the specific values of shape parameters.
Due to the structural properties of granular materials, deformation or displacement of granules under external force is extremely heterogeneous.
China 2011 [2] Wang Zhi-hua, Cao Xiao-qing, Ma Hong-wei Microscopic investigation of cellular materials mechanical properties based on homogenization theory[J] ORDNANCE MATERIAL SCIENCE AND ENGINEETING.
Cellular solids: Structure and properties [M].
That is to say, all factors affect of the end displacement of connectors will affect the specific values of shape parameters.
Due to the structural properties of granular materials, deformation or displacement of granules under external force is extremely heterogeneous.
China 2011 [2] Wang Zhi-hua, Cao Xiao-qing, Ma Hong-wei Microscopic investigation of cellular materials mechanical properties based on homogenization theory[J] ORDNANCE MATERIAL SCIENCE AND ENGINEETING.
Cellular solids: Structure and properties [M].
Online since: April 2007
Authors: Jie Cai Han, Xing Hong Zhang, He Xin Zhang, Chang Qing Hong
Additionally, the microstructure
of the solid phase related to neck growth and solid phase continuity strongly affects the mechanical
properties [2-3].
Unfortunately, reports on the processing and mechanical properties of boride are very limited.
Mechanical properties and mechanisms.
This indicated that high compaction pressures improve the mechanical properties of porous TiB2 ceramics.
The high mechanical properties are related to the growth of the neck growth by surface diffusion in high temperature.
Unfortunately, reports on the processing and mechanical properties of boride are very limited.
Mechanical properties and mechanisms.
This indicated that high compaction pressures improve the mechanical properties of porous TiB2 ceramics.
The high mechanical properties are related to the growth of the neck growth by surface diffusion in high temperature.
Online since: August 2013
Authors: Wei Xiang Liu
Effect Factors of Ceramic Grinding Surface Residual Stresses
Grinding Process Effect on Surface Residual Stress.
Grinding Force Effect on Surface Residual Stresses. under the conditions of small cut depth and repeatedly polishing conditions, the grinding force can make residual stress in smaller variation gradient, larger action depth, can produce good work intensity and surface properties, while in the large depth of cut repeated polishing conditions, even though the compressive residual stress value is larger, the variation gradient acting depth is small, it is not conducive to the strength and surface properties of the workpiece.
In various factors affecting the formation of residual stress, the grinding temperature is the main effect factor of depth and numerical on surface residual stress.
The grinding temperature increases with the grinding depth and wheel speed increases, the grinding depth is the main factors of the grinding temperature.
Therefore, thermoplastic deformation and porcelain phase change are major effect factors on the grinding surface residual stresses.
Grinding Force Effect on Surface Residual Stresses. under the conditions of small cut depth and repeatedly polishing conditions, the grinding force can make residual stress in smaller variation gradient, larger action depth, can produce good work intensity and surface properties, while in the large depth of cut repeated polishing conditions, even though the compressive residual stress value is larger, the variation gradient acting depth is small, it is not conducive to the strength and surface properties of the workpiece.
In various factors affecting the formation of residual stress, the grinding temperature is the main effect factor of depth and numerical on surface residual stress.
The grinding temperature increases with the grinding depth and wheel speed increases, the grinding depth is the main factors of the grinding temperature.
Therefore, thermoplastic deformation and porcelain phase change are major effect factors on the grinding surface residual stresses.
Online since: December 2011
Authors: Wang Yong, Han Tao, Wei Liu
But when the pipeline is welded, the high temperature of welding arc will do harm to the bonding strength of the enamel coating and the base metal because of the differences of thermo-physical properties between them.
When the pipeline with enamel coatings is welded, the high temperature of welding arc will do harm to the bonding strength of the enamel coating and the base metal because of the differences of thermo-physical properties between them.
Thermal Simulation Test The heat affected zone can be divided into some subzones according to different welding thermal cycle, such as fusion zone, overheated zone, normalized zone and imperfect normalized zone [21], and there is much difference among them in properties.
The remelting enamel coating could flow influenced by some factors, but it was restricted by the unmelted coating, some area subsided and some area bulged, so cracks and other flaws could be produced easily superadded residual stress in the enamel coating (Fig.4d).
[21] Zhang Wenyue: Welding metallurgy (Mechanical industry publishing company, Beijing 1993)
When the pipeline with enamel coatings is welded, the high temperature of welding arc will do harm to the bonding strength of the enamel coating and the base metal because of the differences of thermo-physical properties between them.
Thermal Simulation Test The heat affected zone can be divided into some subzones according to different welding thermal cycle, such as fusion zone, overheated zone, normalized zone and imperfect normalized zone [21], and there is much difference among them in properties.
The remelting enamel coating could flow influenced by some factors, but it was restricted by the unmelted coating, some area subsided and some area bulged, so cracks and other flaws could be produced easily superadded residual stress in the enamel coating (Fig.4d).
[21] Zhang Wenyue: Welding metallurgy (Mechanical industry publishing company, Beijing 1993)
Online since: July 2013
Authors: Potejanasak Potejana, Chakthong Thongchattu, Erawin Thavorn
There are techniques for determining which factors are active.
Table 2 Factors and their levels for the experiments Factors Level - Level + A.
All two effects are positive, if considered only these main effects, we would run all two factors at the high level to minimized Ra and maximized MRR.
Chakrabarti, “Conducting carbon black filled EPDM vulcanizates: assessment of dependence of physical and mechanical properties and conducting character on variation of filler loading”, European Polymer Journal, No. 36, 2000, pp. 1043-1054 [3] Y.
Hikichi, “Electrical and elastic properties of conductor-polymer composites”, Journal of Materials science, No. 34, 1999, pp. 2979-2985
Table 2 Factors and their levels for the experiments Factors Level - Level + A.
All two effects are positive, if considered only these main effects, we would run all two factors at the high level to minimized Ra and maximized MRR.
Chakrabarti, “Conducting carbon black filled EPDM vulcanizates: assessment of dependence of physical and mechanical properties and conducting character on variation of filler loading”, European Polymer Journal, No. 36, 2000, pp. 1043-1054 [3] Y.
Hikichi, “Electrical and elastic properties of conductor-polymer composites”, Journal of Materials science, No. 34, 1999, pp. 2979-2985