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Online since: September 2011
Authors: Hao Jie Lv, Guo Qing Hu, Xing Ye Wang
In fact, temperature dependence of the sensor will be related to thermal and mechanical properties of sensor materials, including Young’s modulus, Poisson’s ratio, Coefficients of Thermal Expansion (CTE), Thermal Conduction (TC).
In addition, the thermal properties of the film, which are different from the bulk, will also contribute to performances of the sensor.
However, temperature distribution will produce thermo-elasticity to affect the deflection w.
Temperature Dependence of Material Parameters For thermal conductivity K, temperature becomes a most important effect factor in heat transfer process.
Ma: Practical handbook of thermophysical properties (Chinese Agricultural Machinery Press., China 1969).
In addition, the thermal properties of the film, which are different from the bulk, will also contribute to performances of the sensor.
However, temperature distribution will produce thermo-elasticity to affect the deflection w.
Temperature Dependence of Material Parameters For thermal conductivity K, temperature becomes a most important effect factor in heat transfer process.
Ma: Practical handbook of thermophysical properties (Chinese Agricultural Machinery Press., China 1969).
Online since: December 2011
Authors: Zhan Qiang Liu, Jin Du
While the chips are forming in machining process, the material undergoes severe plastic deformation which affects the integrity of the machined surface and changes the hardness as well as other mechanical properties of both the chip and the machined surface [3].
The factors that affect the plastic deformation in the machined surface include given machining parameters (depth of cut, feed rate and cutting speed), tool geometries (tool rake angle, tool relief angle, inclinational angle, etc) and workpiece material properties (material strength coefficient and strain-hardening exponent).
Thus, cutting speed indirectly affect the values of surface shear strain.
The microstructure and properties of a nickel base superalloy FGH95, J.Univ.
Microstructure, properties and heat treatment process of powder metallurgy superalloy FGH95, J.
The factors that affect the plastic deformation in the machined surface include given machining parameters (depth of cut, feed rate and cutting speed), tool geometries (tool rake angle, tool relief angle, inclinational angle, etc) and workpiece material properties (material strength coefficient and strain-hardening exponent).
Thus, cutting speed indirectly affect the values of surface shear strain.
The microstructure and properties of a nickel base superalloy FGH95, J.Univ.
Microstructure, properties and heat treatment process of powder metallurgy superalloy FGH95, J.
Online since: October 2002
Authors: Jindřich Musil, J. Vlček, F. Regent, F. Kunc, H. Zeman
Special attention is devoted to
mechanical properties of hard nanocomposite coatings and open problems in their formation and characterization.
Mechanical properties of hard nanocomposite coatings Mechanical properties of nanocomposite coatings are well characterized by their hardness, H, the Young´s modulus E* =E/(1-�2) and elastic recovery We.
Mechanical properties of nanocomposite coatings strongly depend on (i) elements which forms individual phases and (ii) relative content of individual phases in the nanocomposite, see Fig.1.
This is due to the fact that films are formed in a medium which is generated in consequence of action of many factors (process parameters) which are mutually very tigthly coupled.
Macrostress, grain size, film structure, binding energy, grain boundary interaction, other factors or their combinations?
Mechanical properties of hard nanocomposite coatings Mechanical properties of nanocomposite coatings are well characterized by their hardness, H, the Young´s modulus E* =E/(1-�2) and elastic recovery We.
Mechanical properties of nanocomposite coatings strongly depend on (i) elements which forms individual phases and (ii) relative content of individual phases in the nanocomposite, see Fig.1.
This is due to the fact that films are formed in a medium which is generated in consequence of action of many factors (process parameters) which are mutually very tigthly coupled.
Macrostress, grain size, film structure, binding energy, grain boundary interaction, other factors or their combinations?
Online since: August 2013
Authors: Yuan Pan, Tong Zhu, Yuan Hua Xie, Jin Han, Mei Yan You, Tian Yu Chai, Yao Nan Zhu, Yun Heng Cao, Xian Jin Li
The non-thermal means the strong reaction with electrical property that microbial cells show in electromagnetic field, which break chemical bonds that maintain the connect of biological macromolecules, inactivate and denature biomolecules, and break cell walls though some kind of mechanical destruction [5, 12, 13].
The energy, power, actuation duration as well as sludge water ratio and other factors affect the sludge disintegration effect of microwave.
He researched using the uniform design test methods, and found that the influence on sludge SCOD increment rate order of various factors is: moisture content > microwave energy consumption> microwave radiation time.
The factors that affect the sludge pyrolysis were the property of the sludge, the pyrolysis equipment, the using of catalyst and the technological conditions.
The main factors having influence on the result of sludge disintegration by high-pressure homogenization are homogenization pressure, homogenization frequency, and sludge concentration etc.
The energy, power, actuation duration as well as sludge water ratio and other factors affect the sludge disintegration effect of microwave.
He researched using the uniform design test methods, and found that the influence on sludge SCOD increment rate order of various factors is: moisture content > microwave energy consumption> microwave radiation time.
The factors that affect the sludge pyrolysis were the property of the sludge, the pyrolysis equipment, the using of catalyst and the technological conditions.
The main factors having influence on the result of sludge disintegration by high-pressure homogenization are homogenization pressure, homogenization frequency, and sludge concentration etc.
Online since: April 2020
Authors: My Pham, Cong Thuat Dang, Chinh Van Nguyen
In particular, aging and corrosion are the main causes of damage affecting the durability of steel bridges.
Rail material in compliance to China standard GB2585-89, in which mechanical property of rail material is given in Table 1.
The mechanical and physical properties of wooden sleepers are taken from TCVN 1462–86 and TCVN 1072: 1971, and refer to the research of Record [16] (see Table 1).
Table 1 Material properties of the rail bridge.
[16] Record, S.J., The mechanical properties of wood: including a discussion of the factors affecting the mechanical properties, and methods of timber testing. 1914: J.
Rail material in compliance to China standard GB2585-89, in which mechanical property of rail material is given in Table 1.
The mechanical and physical properties of wooden sleepers are taken from TCVN 1462–86 and TCVN 1072: 1971, and refer to the research of Record [16] (see Table 1).
Table 1 Material properties of the rail bridge.
[16] Record, S.J., The mechanical properties of wood: including a discussion of the factors affecting the mechanical properties, and methods of timber testing. 1914: J.
Online since: March 2007
Authors: Meng Kao Yeh, Nyan Hwa Tai, Yan Jyun Lin
Introduction
After Iijima discovered carbon nanotubes (CNTs) by arc discharge method [1], many researches are
attracted by the good mechanical and electrical properties of CNTs and focused on CNTs-related
fields.
Yeh et al. [3] found the effective Young's modulus and effective tensile strength for MWNTs as 953 GPa and 22.3 GPa respectively by deducing experimental mechanical properties of MWNTs/phenolic nanocomposites using modified Halpin-Tsai equation.
Yeh et al. [5] investigated the mechanical properties of the MWNTs/phenolic nanocomposites and observed good adhesion between the MWNTs and the resin from the SEM images of the tensile fracture surface of MWNTs/phenolic nanocomposites.
This is probably due to a better thermal conductivity property of carbon nanotubes.
In this case the nonuniform dispersion of the reinforcement, as shown in Fig. 3, became a dominating factor on the glass transition temperature.
Yeh et al. [3] found the effective Young's modulus and effective tensile strength for MWNTs as 953 GPa and 22.3 GPa respectively by deducing experimental mechanical properties of MWNTs/phenolic nanocomposites using modified Halpin-Tsai equation.
Yeh et al. [5] investigated the mechanical properties of the MWNTs/phenolic nanocomposites and observed good adhesion between the MWNTs and the resin from the SEM images of the tensile fracture surface of MWNTs/phenolic nanocomposites.
This is probably due to a better thermal conductivity property of carbon nanotubes.
In this case the nonuniform dispersion of the reinforcement, as shown in Fig. 3, became a dominating factor on the glass transition temperature.
Online since: December 2010
Authors: Jie Sun
The ultra high performance concrete is a new cement-based composite material with ultra-high mechanical properties, excellent durability and excellent volume stability.
So its quality will directly affect the performance of concrete.
(5) Poor conservation system will affect the improvement and application of the strength of concrete.
Currently, as technical and price factors in the practical engineering, conservation system will not be paid attention to, which will extremely be detrimental to increase the strength of ultra high performance concrete.
So its quality will directly affect the performance of concrete.
(5) Poor conservation system will affect the improvement and application of the strength of concrete.
Currently, as technical and price factors in the practical engineering, conservation system will not be paid attention to, which will extremely be detrimental to increase the strength of ultra high performance concrete.
Online since: August 2017
Authors: Takahiro Matsueda, Tatsurou Nakashima
Aspect ratio of crack is one of key factors of fatigue strength prediction in engineering design and civil structures using fracture mechanics and nondestructive inspection.
Using their geometry approximations, we can evaluate various properties of fatigue phenomena.
Keer, ‘Stress intensity factors for cracks of arbitrary shape near an interfacial boundary’, Engineering Fracture Mechanics, 1987, 21, (1), 27-41
Yagishita, ‘Variation of mixed modes stress intensity factors of an inclined semi-elliptical surface crack’, International Journal of Fracture, 1999, 100, 207–225
Takase, ‘Stress concentration factors for round and flat test specimens with notches’, International Journal of Fatigue, 1995, 17, (3), 163-178.
Using their geometry approximations, we can evaluate various properties of fatigue phenomena.
Keer, ‘Stress intensity factors for cracks of arbitrary shape near an interfacial boundary’, Engineering Fracture Mechanics, 1987, 21, (1), 27-41
Yagishita, ‘Variation of mixed modes stress intensity factors of an inclined semi-elliptical surface crack’, International Journal of Fracture, 1999, 100, 207–225
Takase, ‘Stress concentration factors for round and flat test specimens with notches’, International Journal of Fatigue, 1995, 17, (3), 163-178.
Online since: April 2009
Authors: Nigel A. Stone, Mark A. Gibson, Robert Wilson, G.M. Delphine Cantin, Trevor Kearney, David Ritchie, Merchant Yousuff, Raj. Rajakumar, Kevin Rogers, Sri Lathabai
Following conventional batch annealing, strip samples exhibit properties approaching those of
commercial wrought sheet of an equivalent grade.
Assuming equivalent if not superior properties and performance, then the single most important factor to achieve this will be simply driven by economics.
This can be inferred from reference to mechanical properties such as ductility, tensile stress and elongation to failure for CP Grades 1 to 4 [2].
Comparison of PM derived sheet properties with wrought material.
[2] Boyer, R., Welsch, G. and Collings, E.W. (1998) Materials Properties Handbook: Titanium Alloys, ASM International
Assuming equivalent if not superior properties and performance, then the single most important factor to achieve this will be simply driven by economics.
This can be inferred from reference to mechanical properties such as ductility, tensile stress and elongation to failure for CP Grades 1 to 4 [2].
Comparison of PM derived sheet properties with wrought material.
[2] Boyer, R., Welsch, G. and Collings, E.W. (1998) Materials Properties Handbook: Titanium Alloys, ASM International
Online since: August 2011
Authors: Fang Mei, Man Feng Gong
TBCs are known for the high hardness and remarkable tribological properties, making them suitable for industrial applications [3].
However, the work carried out so far did not consider yet an important aspect of thermal spraying technology, which is surface residual stress, an essential parameter in industrial design, significantly affecting the fatigue life of coated parts [4].
The residual stress in coating caused by some factors, such as phase transition and plastic deformation and so on is small at present and the thermal residual stress is main, that is ascribed to the difference of the physical properties between coatings with substrate material.
Thirdly, the differences should lie corresponding to the thermal physical properties.
Su: Journal of Mechanical Strength Vol. 29(2007), p.233 [9] H.
However, the work carried out so far did not consider yet an important aspect of thermal spraying technology, which is surface residual stress, an essential parameter in industrial design, significantly affecting the fatigue life of coated parts [4].
The residual stress in coating caused by some factors, such as phase transition and plastic deformation and so on is small at present and the thermal residual stress is main, that is ascribed to the difference of the physical properties between coatings with substrate material.
Thirdly, the differences should lie corresponding to the thermal physical properties.
Su: Journal of Mechanical Strength Vol. 29(2007), p.233 [9] H.