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Online since: September 2011
Authors: Ren He Wang, Hao Cui, Dong Wei Li
We can get the basic physical and mechanical performance parameters of the sample: the uniaxial compressive strength and elastic modulus and stress-strain curve, etc.
With reference to the coal industry standard of the artificially frozen soil physical and mechanical performance test (MT/T593.4 1996); 3.
Study on mechanical properties of frozen rocks The cretaceous strata frozen rocks stress-strain curve is the relationship curve of the vertical load (the axial stress σ) and vertical compression deformation ε.
As some of the soil samples contained sandwich, some test result laws were not obvious.The elastic modulus of rock samples had business with the soil properties, and stress-strain curves of the sample loading process, and many other factors.
Experimental research on the mechanical parameters of frozen pipes under low temperature [J].
With reference to the coal industry standard of the artificially frozen soil physical and mechanical performance test (MT/T593.4 1996); 3.
Study on mechanical properties of frozen rocks The cretaceous strata frozen rocks stress-strain curve is the relationship curve of the vertical load (the axial stress σ) and vertical compression deformation ε.
As some of the soil samples contained sandwich, some test result laws were not obvious.The elastic modulus of rock samples had business with the soil properties, and stress-strain curves of the sample loading process, and many other factors.
Experimental research on the mechanical parameters of frozen pipes under low temperature [J].
Online since: August 2013
Authors: Xiao Guang Yu, Jian Chen
Industrial dust emissions is one of the main factors of cause air pollution [1].
Determining the distance between the filter bag hole is the mainly content in the design of filter plate, which in relation to the length of the filter bag, the diameter of the bag, filtration velocity, dust properties and other factors.
But if holes arranged depopulation, it will increase the size of the equipment, increase production costs, affecting the transport of equipment, installation and waste of materials.
But they don't bear loads, it just to meet on the process and some properties of some special requirements, so to simplify handling, these structures should not be consider [4].
Counting up displacements, stresses and safety factor data get Table 3-4.
Determining the distance between the filter bag hole is the mainly content in the design of filter plate, which in relation to the length of the filter bag, the diameter of the bag, filtration velocity, dust properties and other factors.
But if holes arranged depopulation, it will increase the size of the equipment, increase production costs, affecting the transport of equipment, installation and waste of materials.
But they don't bear loads, it just to meet on the process and some properties of some special requirements, so to simplify handling, these structures should not be consider [4].
Counting up displacements, stresses and safety factor data get Table 3-4.
Online since: February 2018
Authors: Xiao Zhang, Xin Xing Zhou
Moreover, foaming and nucleation and growth mechanisms is closely related to the thermal and mechanical properties of SPU.
Zou et al [11] investigated the effect of hard segments on the thermal and mechanical properties of polyurethane foams.
The morphology results matched well with mechanical properties results.
As described elsewhere, the SPU with the hydroxyl groups enriched on their surface and improved their mechanical properties.
Kaur, Mechanical and thermal properties of castor oil-based polyurethane adhesive: effect of TiO2, filler, Advances in Polymer Technology. 35 (2016) 1082-1089.DOI: 10.1002/adv.21637
Zou et al [11] investigated the effect of hard segments on the thermal and mechanical properties of polyurethane foams.
The morphology results matched well with mechanical properties results.
As described elsewhere, the SPU with the hydroxyl groups enriched on their surface and improved their mechanical properties.
Kaur, Mechanical and thermal properties of castor oil-based polyurethane adhesive: effect of TiO2, filler, Advances in Polymer Technology. 35 (2016) 1082-1089.DOI: 10.1002/adv.21637
Online since: March 2007
Authors: Hyoung Seop Kim
It is based on recent modelling that appears to provide a
conclusive description of the phenomenology and the mechanisms underlying the mechanical
properties of NCMs.
Mechanical properties of NCMs have been recently reviewed [4].
It is based on recent modelling that appears to provide a conclusive description of the phenomenology and the mechanisms underlying the mechanical properties of NCMs.
The deformation mechanism map is meaningful in that mechanical properties related with grain size and strain rate can be explained.
One of the main factors governing deformation mechanisms is temperature.
Mechanical properties of NCMs have been recently reviewed [4].
It is based on recent modelling that appears to provide a conclusive description of the phenomenology and the mechanisms underlying the mechanical properties of NCMs.
The deformation mechanism map is meaningful in that mechanical properties related with grain size and strain rate can be explained.
One of the main factors governing deformation mechanisms is temperature.
Online since: August 2014
Authors: Traian Fleșer, Marius Pop-Calimanu, Cristian Ciucă, Radu Cojocaru, Petronela Lucia Ciorpac
In order to determine the mechanical properties of the AA2124/SiC/25p-T4 composite material after FSW welding, static tensile test was performed.
Fig. 4 XRD patterns of the base material and stirred zone The effect of the process parameters on the mechanical properties of the weld Microhardness measurements.
The mechanical properties of the welded joint are close to the base material.
Balasubramanian, Effect of Heat Input on Mechanical and Metallurgical Properties of Friction Stir Welded AA6061-10% SiCp MMMCs, JMEP, 21 (2012) 2417-2428
Azizieh, Evaluation of microstructure and mechanical properties in friction stir welded A356+15%SiCp cast composite, Mater Lett, 60 (2006) 565–568
Fig. 4 XRD patterns of the base material and stirred zone The effect of the process parameters on the mechanical properties of the weld Microhardness measurements.
The mechanical properties of the welded joint are close to the base material.
Balasubramanian, Effect of Heat Input on Mechanical and Metallurgical Properties of Friction Stir Welded AA6061-10% SiCp MMMCs, JMEP, 21 (2012) 2417-2428
Azizieh, Evaluation of microstructure and mechanical properties in friction stir welded A356+15%SiCp cast composite, Mater Lett, 60 (2006) 565–568
Online since: January 2014
Authors: Zheng Tang Liu, Xing Sen Che
Up to now, some optical, electrical, mechanical and structural properties have already been reported for a-Ge1-xCx:H films prepared by using different techniques, such as chemical vapor deposition [7-9], plasma deposition processing [10, 11], all of which can get a high quality film.
As an absorber layer applied for a tandem solar cell, it is important and meaningful to investigate the optical and chemical bonding properties of a-Ge1-xCx:H films.
As is known that the change in the optical properties of the films mainly depends on the composition and structure of the films and all the samples fabricated have amorphous structure.
Therefore, the optical gap of the a-Ge1-xCx:H films are mainly affected by the composition and atomic bonding character of the films.
Although the content of hydrogen in the films can not be obtained by XPS, the relative atomic concentration of C, Ge and O in the films is unaffected and obtained from the computation of the sensitivity factors and peak areas of C1s, Ge3d and O1s.
As an absorber layer applied for a tandem solar cell, it is important and meaningful to investigate the optical and chemical bonding properties of a-Ge1-xCx:H films.
As is known that the change in the optical properties of the films mainly depends on the composition and structure of the films and all the samples fabricated have amorphous structure.
Therefore, the optical gap of the a-Ge1-xCx:H films are mainly affected by the composition and atomic bonding character of the films.
Although the content of hydrogen in the films can not be obtained by XPS, the relative atomic concentration of C, Ge and O in the films is unaffected and obtained from the computation of the sensitivity factors and peak areas of C1s, Ge3d and O1s.
Online since: November 2012
Authors: Xiu Ping Yang, Lei Zhang, Ying Xin
Finite element analysis of bicycle saddle based on ergonomics
Ying Xin1, a, Xiuping Yang 2,b and Lei Zhang3,c
1Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems,Tianjin University of Technology Tianjin 300384,China
2School of Mechanical Engineering,Tianjin University of Technology Tianjin 300384,China
3School of Fine Arts,Tianjin University of Technology Tianjin 300384,China
axinying913@163.com, byhp420@sina.com, czhanglei_885@sina.com
Keywords: Finite element method, Man-machine engineering, Bicycle-saddle.
Seating comfort is an important factor for bicycle-rider.
It was shown that riding on discomfort saddle could affect the blood circulation system, genitourinary system of human, and harm to their health.
The main purpose of the present work is to introduce a fairly detailed finite- element model for a seated human and for a generic bicycle saddle to carry out a preliminary computational finite element analysis of the seated-human/saddle interactions in order to help identify the factors which affect seating comfort/discomfort.
Table 1 Inertial parameters of human body's rigid link Fig.1 Multi-rigid body Fig.2 Finite element model Finite element analysis of seated human/saddle Igs file was imported into the finite element analysis software, ansys, then the relevant material properties of human body and the saddle were given.
Seating comfort is an important factor for bicycle-rider.
It was shown that riding on discomfort saddle could affect the blood circulation system, genitourinary system of human, and harm to their health.
The main purpose of the present work is to introduce a fairly detailed finite- element model for a seated human and for a generic bicycle saddle to carry out a preliminary computational finite element analysis of the seated-human/saddle interactions in order to help identify the factors which affect seating comfort/discomfort.
Table 1 Inertial parameters of human body's rigid link Fig.1 Multi-rigid body Fig.2 Finite element model Finite element analysis of seated human/saddle Igs file was imported into the finite element analysis software, ansys, then the relevant material properties of human body and the saddle were given.
Online since: January 2014
Authors: Jian Yang Xue, Jian Peng Lin, Hui Ma
However, the mechanical property, durability and deformation performance of recycled concrete structure are lower than those of original concrete structure since the source of recycled aggregate is uncertain.
Tab.2 summarizes measured mechanical properties of structural steel and reinforcement.
The displacement ductility factor is listed in Tab. 4
At the initial stage, the stiffness degeneration of the specimens is not affected by the increase of volumetric stirrup ratio.
Research on physical and mechanical properties of recycled concrete affected by water absorption of recycled aggregate[D].
Tab.2 summarizes measured mechanical properties of structural steel and reinforcement.
The displacement ductility factor is listed in Tab. 4
At the initial stage, the stiffness degeneration of the specimens is not affected by the increase of volumetric stirrup ratio.
Research on physical and mechanical properties of recycled concrete affected by water absorption of recycled aggregate[D].
Online since: February 2018
Authors: A. Meoni, F. Ubertini, Antonella D'Alessandro
In particular, the use of carbon nanofillers into the matrix of construction materials can provide enhanced properties to the material in both of mechanical and electrical performance.
Appropriate nanosized additives can be inserted into structural reinforced concrete (RC) as fillers, providing enhanced chemical, physical, mechanical and electrical properties.
Among available fillers, carbon-based ones appear particularly suitable, due to their enhanced mechanical and electrical properties.
They possess remarkable mechanical and electrical properties which make them suitable to cast smart composites for constructions.
Those particles were chosen for their enhanced mechanical and electrical properties which make them possible candidates for the realization of smart sensors for the monitoring of structures.
Appropriate nanosized additives can be inserted into structural reinforced concrete (RC) as fillers, providing enhanced chemical, physical, mechanical and electrical properties.
Among available fillers, carbon-based ones appear particularly suitable, due to their enhanced mechanical and electrical properties.
They possess remarkable mechanical and electrical properties which make them suitable to cast smart composites for constructions.
Those particles were chosen for their enhanced mechanical and electrical properties which make them possible candidates for the realization of smart sensors for the monitoring of structures.
Online since: August 2013
Authors: Ting Ting Ji, Hai Jun Wang, Qian Tao Huo, De Rao Ding
The key factors to reach 4000A output
As one of the important components of the shunt excitation system, the thyristor rectifier device its single cabinet output current capacity determines the overall performance and configuration.
How to realize 4000A output needs an overall consideration of the following three factors: (1) Radiator thermal resistance.
It is well known that the air pressure is the main factor affecting the air speed.
The 3240 epoxy board has good mechanical properties in the medium temperature, good electrical performance and stability under high humidity and F class insulation temperature (155 °C), so we choose epoxy board as the isolation for the radiator.
PC board has a high light transmittance, high impact toughness and high mechanical strength, good electrical insulating properties, very good dimensional stability and heat deformation capacity, which is commonly used as shield or mask in the electrical switchgear.
How to realize 4000A output needs an overall consideration of the following three factors: (1) Radiator thermal resistance.
It is well known that the air pressure is the main factor affecting the air speed.
The 3240 epoxy board has good mechanical properties in the medium temperature, good electrical performance and stability under high humidity and F class insulation temperature (155 °C), so we choose epoxy board as the isolation for the radiator.
PC board has a high light transmittance, high impact toughness and high mechanical strength, good electrical insulating properties, very good dimensional stability and heat deformation capacity, which is commonly used as shield or mask in the electrical switchgear.