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Online since: February 2011
Authors: Yan Dong Liu, Fu Wang, Zheng Gui Zhang
Introduction
Texture is a very important factor to determine the anisotropy properties of poly-crystal materials.
Due to the important effect of texture on material manufacture and usage, it is necessary to investigate the relationship of texture and material property in order to optimize material property by controlling texture.
Low ferromagnetic loss and high magnetic induction intensity are the important technical properties for silicon steel.
(2) The annealing temperature is an important factor to control recrystallization texture and microstructure.
The magnetic property is the best when annealed at 8000C.
Due to the important effect of texture on material manufacture and usage, it is necessary to investigate the relationship of texture and material property in order to optimize material property by controlling texture.
Low ferromagnetic loss and high magnetic induction intensity are the important technical properties for silicon steel.
(2) The annealing temperature is an important factor to control recrystallization texture and microstructure.
The magnetic property is the best when annealed at 8000C.
Online since: November 2013
Authors: Wei Hong Li, Ying Ying Xu
In fact the destruction of concrete structures is often not brought about by a single factor, but the result of compound function of many factors.
In addition to environmental factors which cause the destruction of the concrete structure, some physical and chemical factors of concrete itself, may also cause serious damage to the concrete structure, resulting in concrete failure.
Therefore, to improve the durability of concrete, it must reduce or eliminate these factors of structural failure.
Therefore, through analyzing the characteristics of the ultrasonic wave and measuring the acoustic quantities to determine the geometry of objects or materials, mechanical properties and the size of the internal defect and orientation.
The basic principle is: the modal parameters (such as natural frequencies, mode shapes, modal damping, etc.) is a structured physical properties (such as mass, stiffness and damping) function, thereby changes of structure physical properties will cause structural vibration response change.
In addition to environmental factors which cause the destruction of the concrete structure, some physical and chemical factors of concrete itself, may also cause serious damage to the concrete structure, resulting in concrete failure.
Therefore, to improve the durability of concrete, it must reduce or eliminate these factors of structural failure.
Therefore, through analyzing the characteristics of the ultrasonic wave and measuring the acoustic quantities to determine the geometry of objects or materials, mechanical properties and the size of the internal defect and orientation.
The basic principle is: the modal parameters (such as natural frequencies, mode shapes, modal damping, etc.) is a structured physical properties (such as mass, stiffness and damping) function, thereby changes of structure physical properties will cause structural vibration response change.
Online since: February 2012
Authors: Qing Li
Coal and gas outburst is ground stress, gas, coal of the physical and mechanical properties of three aspects such as the result of the combined action of.
Among them were the dominant factors of in-situ stress is taking place of coal and gas outburst in the necessary condition.
Large area ground stress, gas pressure also big; In tectonic stress that the effect of the physical and mechanical properties of coal has obvious change.
According to the influence of coal and gas outburst in the analysis of the factors and the forecasting coal seam outburst dangerous the possibility of access data, on the basis of the three coal seam coal mine qidong well for coal and gas outburst prediction area consider factors include: the now stress field distribution in layer status, geological power division results classification, gas content and its change, thickness of coal seam and the change, magmatic rocks distribution, coal change six factors.
In addition to the fall in the two regions outside the area, the occurrence of gas and the gas pressure may be smaller factors, this area index value of 10.
Among them were the dominant factors of in-situ stress is taking place of coal and gas outburst in the necessary condition.
Large area ground stress, gas pressure also big; In tectonic stress that the effect of the physical and mechanical properties of coal has obvious change.
According to the influence of coal and gas outburst in the analysis of the factors and the forecasting coal seam outburst dangerous the possibility of access data, on the basis of the three coal seam coal mine qidong well for coal and gas outburst prediction area consider factors include: the now stress field distribution in layer status, geological power division results classification, gas content and its change, thickness of coal seam and the change, magmatic rocks distribution, coal change six factors.
In addition to the fall in the two regions outside the area, the occurrence of gas and the gas pressure may be smaller factors, this area index value of 10.
Online since: February 2014
Authors: Khaidzir Hamzah, Sib Krishna Ghoshal, Nur Alia Fauzia Abdullah, Md Rahim Sahar
The effect of silver nanoparticles on the luminescent properties of the samarium-doped sodium tellurite glass is investigated.
Annealing is done to eliminate thermal and mechanical stresses.
The relative enhancement factors of various emission wavelengths are listed in Table 1 and its graph is shown in Fig.2.
Many other factors should be taken into account such as radiative lifetime, luminescence decay, size and shape of NPs, and also by employing suitable theory and models.
“Optical Properties and Spectroscopy of Nanomaterials”.
Annealing is done to eliminate thermal and mechanical stresses.
The relative enhancement factors of various emission wavelengths are listed in Table 1 and its graph is shown in Fig.2.
Many other factors should be taken into account such as radiative lifetime, luminescence decay, size and shape of NPs, and also by employing suitable theory and models.
“Optical Properties and Spectroscopy of Nanomaterials”.
Online since: November 2017
Authors: Igor Barényi, Ján Bezecný
Its appearance is connected with the decrease of mechanical properties, toughness and contraction mainly.
It is proven that important influence on mechanical properties has the size of precipitates besides the amount of IG facettes.
There are not any specific criteria to determine its defectivity and mechanical properties values are crucial.
The presence of shiny rows causes a decrease of mechanical properties (mainly plasticity).
IG cleavage - their presence is connected with an important degradation of plastic and brittle-fracture properties.
It is proven that important influence on mechanical properties has the size of precipitates besides the amount of IG facettes.
There are not any specific criteria to determine its defectivity and mechanical properties values are crucial.
The presence of shiny rows causes a decrease of mechanical properties (mainly plasticity).
IG cleavage - their presence is connected with an important degradation of plastic and brittle-fracture properties.
Online since: July 2014
Authors: Jie Zhao
Compared with soil, rock has better mechanical property conditions, so it is common to see steeper and higher rock slopes without obvious sliding surface.
All these factors above and other influence factors as well as surface condition contribute to the control elements of rock slopes’ stability.
Fig.1 Sliding mode of typical rock slopes Long-term erosion unloading, weathering, underground water as well as blasting in the mountain have impact on the stability of slopes, and this influence is mainly express as affecting the strength parameters of joint combination in different depths.
The dynamic mechanical properties of unloading rock mass mainly reflected in degradation of mechanical constitutive relation, strength attenuation in unloading rock mass, increment of instable rock mass, reduction of rock mechanics parameters, and worsen of groundwater condition.
Research on Rock Mass Properties Near Anchor With Prestressing For TGP’S Permanent Shiplock, J.
All these factors above and other influence factors as well as surface condition contribute to the control elements of rock slopes’ stability.
Fig.1 Sliding mode of typical rock slopes Long-term erosion unloading, weathering, underground water as well as blasting in the mountain have impact on the stability of slopes, and this influence is mainly express as affecting the strength parameters of joint combination in different depths.
The dynamic mechanical properties of unloading rock mass mainly reflected in degradation of mechanical constitutive relation, strength attenuation in unloading rock mass, increment of instable rock mass, reduction of rock mechanics parameters, and worsen of groundwater condition.
Research on Rock Mass Properties Near Anchor With Prestressing For TGP’S Permanent Shiplock, J.
Online since: August 2013
Authors: Bin Li, Yang Wen, Su Fen Dong
Slag powder contents affects on 28d compressive strength of C40 concrete
Fig.2.
Influence of slag powder on drying shrinkage property of concrete Shrinkage is an important reason of concrete crack, and it is also one key factor that affects the concrete structure quality decline.
Fig.5.Slag powder contents affects on C40 concrete seepage height Fig.4.
Slag powder instead of 50% cement, the various performance the properties are relatively high.
[5]Eva Vejmelková,Milena Pavlíková,Zbynek Ker ner,etal.High performance concrete containing lower slag amount:A complex view of mechanical and durability properties[J].Construction and Building Materials,2009(23):2237-2245.
Influence of slag powder on drying shrinkage property of concrete Shrinkage is an important reason of concrete crack, and it is also one key factor that affects the concrete structure quality decline.
Fig.5.Slag powder contents affects on C40 concrete seepage height Fig.4.
Slag powder instead of 50% cement, the various performance the properties are relatively high.
[5]Eva Vejmelková,Milena Pavlíková,Zbynek Ker ner,etal.High performance concrete containing lower slag amount:A complex view of mechanical and durability properties[J].Construction and Building Materials,2009(23):2237-2245.
Online since: May 2014
Authors: Kai Wen Huang, Yu Ting Chang, Ping Tun Teng, Po Chin Liang, Fuh Yu Chang
Sudheer [5] demonstrated the fabrication of cobalt-chromium cardiovascular stent by modulated pulsed Nd:YAG laser and he intended to use it to improve the cutting quality and reduce heat-affected zone (HAZ).
HAZ can modify the metallurgical properties and affect the mechanical properties of the stent material and lead to micro cracks and embrittlement to the material.
Moreover, the concentricity between the tube clamp, the rotating table and the tube was an important factor affecting the processing precision.
The nitinol has great biocompatible, shape-memory and superelastic property which is choose as a self-expanding stent material in the commercial biliary stent market.
A less heat affected zone could be achieved by using nitrogen instead of air as the assisting gas due to weak oxidation effect.
HAZ can modify the metallurgical properties and affect the mechanical properties of the stent material and lead to micro cracks and embrittlement to the material.
Moreover, the concentricity between the tube clamp, the rotating table and the tube was an important factor affecting the processing precision.
The nitinol has great biocompatible, shape-memory and superelastic property which is choose as a self-expanding stent material in the commercial biliary stent market.
A less heat affected zone could be achieved by using nitrogen instead of air as the assisting gas due to weak oxidation effect.
Online since: January 2014
Authors: Can Mei, Xu Dong Fu, Ben Jiao Zhang
On the composition and structure, the soil presents anisotropy, heterogeneity, discontinuity and randomness; on mechanical properties, it shows strong nonlinear, inelastic and viscous.
The relationship between stress and strain of soil is very complex, which is affected by factors such as the stress path, the state of soil, etc [2,3,4].
Due to the nature of the geotechnical materials, it is very difficult to establish an ideal constitutive relation, so that it is always to simplify various conditions to reflect its main properties in the engineering application.
Thus it provided evidence that interaction effect of pile and soil is concerned with these factors, such as pile and soil properties, the load transfer law of piles, stress level, etc.
The area of soil to be weighted was to take comprehensive consideration of soil nature, stress level and other factors, which affect the interaction of piles and soil.
The relationship between stress and strain of soil is very complex, which is affected by factors such as the stress path, the state of soil, etc [2,3,4].
Due to the nature of the geotechnical materials, it is very difficult to establish an ideal constitutive relation, so that it is always to simplify various conditions to reflect its main properties in the engineering application.
Thus it provided evidence that interaction effect of pile and soil is concerned with these factors, such as pile and soil properties, the load transfer law of piles, stress level, etc.
The area of soil to be weighted was to take comprehensive consideration of soil nature, stress level and other factors, which affect the interaction of piles and soil.
BFRP Bars as an Alternative Reinforcement of Concrete Structures - Compatibility and Adhesion Issues
Online since: November 2015
Authors: Andrzej Garbacz, Marek Urbański, Andrzej Łapko
The presented value of elasticity modulus was estimated as a additives composite property taking into account volume fractions of basalt and carbon fibers their properties as well as properties of epoxy matrix.
In the ACI Manual, additionally some rules for selection are formulated: “If some properties of the repair material are greatly different from those of the substrate concrete, such as the coefficient of thermal expansion, other properties should compensate for these differences for the repair to perform successfully; for example, a lower modulus of elasticity to reduce thermal stresses”.
Many of the studies conducted so far show a fairly high complexity of factors and circumstances affecting the adhesion of FRP bars to concrete.
It was assumed that: concrete compressive strength equals fcm = 33MPa, tensile strength fctm = 2.6MPa and BFRP bar properties: tensile strength ff = 1100MPa, compressive strength ffc = 950MPa, tensile modulus Ef = 60GPa.
This model also enable the prediction of behavior the system: HFRP - concrete an checking the compatibility requirements that will not be met either at the stage of selection of HFRP properties or during the use of the concrete member.
In the ACI Manual, additionally some rules for selection are formulated: “If some properties of the repair material are greatly different from those of the substrate concrete, such as the coefficient of thermal expansion, other properties should compensate for these differences for the repair to perform successfully; for example, a lower modulus of elasticity to reduce thermal stresses”.
Many of the studies conducted so far show a fairly high complexity of factors and circumstances affecting the adhesion of FRP bars to concrete.
It was assumed that: concrete compressive strength equals fcm = 33MPa, tensile strength fctm = 2.6MPa and BFRP bar properties: tensile strength ff = 1100MPa, compressive strength ffc = 950MPa, tensile modulus Ef = 60GPa.
This model also enable the prediction of behavior the system: HFRP - concrete an checking the compatibility requirements that will not be met either at the stage of selection of HFRP properties or during the use of the concrete member.