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Online since: January 2011
Authors: Tao Ge, Yong Kang Zhang, Xiao Meng Chu
Introduction
Compared with conventional material Carbon Fiber composites(CFCs) have outstanding properties : low density, high strength, good corrosion resistance etc. therefore CFCs are wildly used in fields of aeronautics, aeronautics, astronautics and military.
Many factors influence the quality of cutting: cutting speed, cutting environment(including temperature, humidity, etc.), assistant gas(including gas type, gas pressure, etc.), laser parameters( laser energy, pulse width, pulse frequency, laser modulus, laser Power distribution, spot diameter, defocused amount, etc.).
HAZ (heat affected zone) indicates the effect of material surface by laser beam radiating.
Laser cutting is a thermal effect of laser on material, so heat affected zone is a very important evaluation index of cutting quality.
If the laser energy is too high, cutting section surface will be carbonation seriously, so section material properties and degree of finish will decrease.
Many factors influence the quality of cutting: cutting speed, cutting environment(including temperature, humidity, etc.), assistant gas(including gas type, gas pressure, etc.), laser parameters( laser energy, pulse width, pulse frequency, laser modulus, laser Power distribution, spot diameter, defocused amount, etc.).
HAZ (heat affected zone) indicates the effect of material surface by laser beam radiating.
Laser cutting is a thermal effect of laser on material, so heat affected zone is a very important evaluation index of cutting quality.
If the laser energy is too high, cutting section surface will be carbonation seriously, so section material properties and degree of finish will decrease.
Online since: June 2011
Authors: Wei Bo Huang, Ping Lu, Jing Zhang, Xu Dong Liu
Adhesion is a significant factor affecting performance of protective coating, which should tightly bond to the concrete substrate to provide long-term protection against corrosive environments.
As for QF-2 coating, it showed a lower decreased rate and kept a good adhesion after the co-action of two double factors exposure.
Study on the Properties of Polyaspartic Polyurea Coated Concrete under Salt Fog Exposure. 3rd international conference on concrete,2008.10,yantai, China
Study on dynamic mechanical behavior of polyaspartic polyurea.
Research on the morphology and properties of polyaspartic ester polyurea with different hard segment contents.
As for QF-2 coating, it showed a lower decreased rate and kept a good adhesion after the co-action of two double factors exposure.
Study on the Properties of Polyaspartic Polyurea Coated Concrete under Salt Fog Exposure. 3rd international conference on concrete,2008.10,yantai, China
Study on dynamic mechanical behavior of polyaspartic polyurea.
Research on the morphology and properties of polyaspartic ester polyurea with different hard segment contents.
Online since: October 2011
Authors: Chun Yuan Liu, Cheng Wei Liu, Yu Lian Guo, Jie Ding
Introduction
In recent years, geotextile bags filling with sand are widely applied in the cofferdam and subgrade engineering, studies of sandbag Cofferdams’ stability are increasingly mature, but these studies usually use circular slide method for analysis, and inadequate considered the influence factors of the sandbag cofferdam’s stability.
Fig 1 Slide of the subgrade Security analysis of the subgrade C, are the main strength quotas to affect the slope’s instability, their variability will cause very big effect on safety evaluation [4].
Using the data got from soil experiment and displacement of embankment monitored on -site, we make back analysis of the soil’s mechanical parameters, main soil layer distribution and physical properties of this section are shown in Table 1.
(2) When checking cofferdam’s stability, properties of geosynthetics and soil layer’s interface are key technical indicators, cofferdam’s stability during construction is affected by construction factors, such as loading rate and construction process.
Fig 1 Slide of the subgrade Security analysis of the subgrade C, are the main strength quotas to affect the slope’s instability, their variability will cause very big effect on safety evaluation [4].
Using the data got from soil experiment and displacement of embankment monitored on -site, we make back analysis of the soil’s mechanical parameters, main soil layer distribution and physical properties of this section are shown in Table 1.
(2) When checking cofferdam’s stability, properties of geosynthetics and soil layer’s interface are key technical indicators, cofferdam’s stability during construction is affected by construction factors, such as loading rate and construction process.
Online since: October 2014
Authors: Qi You Cheng, Jian Ping Huang, Ai Min Ling, Zhi Zhuang Feng
Therefore, it is important to understand the effects of resin content on the mechanical properties of composites.
The results show that the resin content has a great effect on the mechanical properties of carbon fabric/epoxy composites.
The investigation mentioned indicated that the resin content influence several mechanical properties, e.g., longitudinal compressive modulus and strength, transverse tensile modulus and strength, and bending and shear properties.
is a load multiplier or buckling factor.
Effect of the Resin Content on the mechanical Properties of Carbon Fabric/Epocy Composites[J].FIBERCOMPOSITES, 2003,[3]:15-17.
The results show that the resin content has a great effect on the mechanical properties of carbon fabric/epoxy composites.
The investigation mentioned indicated that the resin content influence several mechanical properties, e.g., longitudinal compressive modulus and strength, transverse tensile modulus and strength, and bending and shear properties.
is a load multiplier or buckling factor.
Effect of the Resin Content on the mechanical Properties of Carbon Fabric/Epocy Composites[J].FIBERCOMPOSITES, 2003,[3]:15-17.
Online since: September 2014
Authors: Xiao Ping Wang, Kai Lu, Zhong Lan Luo
By touching the object in the 2D screen, users can change some properties of the corresponding object in the 3D virtual world. 3D object picking is widely studied and applied in the following three situations: 1) the target object is significantly occluded; 2) the target object has small size; 3) and the target object is in a dynamically changing location.
In order to reduce the influence of human factors to the experimental results, the one thousand times of pickup operation are divided into 10 groups evenly.
Many previous studies [8-10] have shown that the picking accuracy is the main factor to evaluate a 3D object picking Technique.
Proceedings of ASME 2013 International Mechanical Engineering Congress and Exposition.
American Society of Mechanical Engineers, 2013: V005T05A053-V005T05A053
In order to reduce the influence of human factors to the experimental results, the one thousand times of pickup operation are divided into 10 groups evenly.
Many previous studies [8-10] have shown that the picking accuracy is the main factor to evaluate a 3D object picking Technique.
Proceedings of ASME 2013 International Mechanical Engineering Congress and Exposition.
American Society of Mechanical Engineers, 2013: V005T05A053-V005T05A053
Online since: June 2015
Authors: Sergio Neves Monteiro, Afonso Rangel Garcez de Azevedo, Jonas Alexandre, Olivia del Puppo Pereira Fernandes, Geruza Rafaela de Oliveira, José Jefferson da Silva Nascimento, Flavio de Andrade Silva
Temperature and moisture substantially affect the water elimination procedure, occurring in the drying stage, of ceramic blocks used in building construction.
The following conditions are associated with the model: · Constant thermo-physical properties; · No internal source of energy; · Homogeneous and isotropic body; · Uniform properties at the beginning of the drying process; · 3-D axial symmetry around the center; · Convective boundary conditions on the body surface; · No volume variation throughout the process; The general differential equation that describes the diffusion in the body shown in Fig. 1, with dimensions 2R1 x 2R2 x 2R3, is: (1) where is the nabla operator.
The main properties needed for the simulation were presented by Pereira et al [11] and shown in Table 1.
In order to attend these conditions, several factors, such as drying velocity, air temperature, atmosphere relative humidity, area/volume ratio of the block and material porosity should be controlled.
· In spite of considering the same heat transfer coefficient for all faces of the block, a control of the thermal properties and drying parameters was successful in achieving a ceramic product with required quality
The following conditions are associated with the model: · Constant thermo-physical properties; · No internal source of energy; · Homogeneous and isotropic body; · Uniform properties at the beginning of the drying process; · 3-D axial symmetry around the center; · Convective boundary conditions on the body surface; · No volume variation throughout the process; The general differential equation that describes the diffusion in the body shown in Fig. 1, with dimensions 2R1 x 2R2 x 2R3, is: (1) where is the nabla operator.
The main properties needed for the simulation were presented by Pereira et al [11] and shown in Table 1.
In order to attend these conditions, several factors, such as drying velocity, air temperature, atmosphere relative humidity, area/volume ratio of the block and material porosity should be controlled.
· In spite of considering the same heat transfer coefficient for all faces of the block, a control of the thermal properties and drying parameters was successful in achieving a ceramic product with required quality
Online since: December 2006
Authors: Soon Bok Lee, Kyoung Wook Paik, Jin Hyoung Park, Chang Kyu Chung
Among many factors that influence the reliability of a flip-chip assembly using NCF
interconnections, the most effective parameters are often the coefficient of thermal expansion
(CTE), the modulus (E), and the glass transition temperatures (Tg).
Of these factors, the effect of Tg on thermal deformation and device reliability is significant; however, it has not been shown clearly what effect Tg has on the reliability of NCF.
The material properties of a NCF between the chip and a PCB have enormous effects on thermal fatigue.
Of these factors, the effect of Tg on thermal deformation and device reliability is significant; however, it has not been shown clearly what effect Tg has on the reliability of NCF.
This delamination is mainly affected by the shear strain at the edge of the chip.
Of these factors, the effect of Tg on thermal deformation and device reliability is significant; however, it has not been shown clearly what effect Tg has on the reliability of NCF.
The material properties of a NCF between the chip and a PCB have enormous effects on thermal fatigue.
Of these factors, the effect of Tg on thermal deformation and device reliability is significant; however, it has not been shown clearly what effect Tg has on the reliability of NCF.
This delamination is mainly affected by the shear strain at the edge of the chip.
Online since: November 2020
Authors: Sadegh Sadeghzadeh, Mohammad Mahinzare
By implementing the modified couple stress theory and also molecular dynamics, Mohammadi et al. [38] have investigated the properties of a micro conical shell resting on a Winkler foundation.
These properties of NSGT have motivated the researchers to apply it to many problems which were studied before by other theories.
Table 1 summarizes the material properties of the considered FG material.
The excitation of a rotating nanoshell seriously affects its resonance.
Agwa, Analysis of size-dependent mechanical properties of CNTs mass sensor using energy equivalent model, Sensors and Actuators A: Physical 246 (2016) pp. 9-17
These properties of NSGT have motivated the researchers to apply it to many problems which were studied before by other theories.
Table 1 summarizes the material properties of the considered FG material.
The excitation of a rotating nanoshell seriously affects its resonance.
Agwa, Analysis of size-dependent mechanical properties of CNTs mass sensor using energy equivalent model, Sensors and Actuators A: Physical 246 (2016) pp. 9-17
Online since: December 2013
Authors: Michal Petrů, Ondřej Novák, Petr Lepšík
Polymer solutions due to their chemical and physical properties requires for efficient spinning with different intensity of the charge.
The authors introduced an electric field concentration factor (EFCF).
This factor is defined as a degree of the convergence and divergence of jets to the spinning axis.
This affects the potential distribution, resulting maximum intensity of electric field and therefore the efficiency of the production line.
Simanjuntak, “Finite element method model of the mechanical behavior of Jatropha curcas L. seed under compression loading,” Biosystems Engineering, Vol. 111, No. 4, 2012, pp. 412-421
The authors introduced an electric field concentration factor (EFCF).
This factor is defined as a degree of the convergence and divergence of jets to the spinning axis.
This affects the potential distribution, resulting maximum intensity of electric field and therefore the efficiency of the production line.
Simanjuntak, “Finite element method model of the mechanical behavior of Jatropha curcas L. seed under compression loading,” Biosystems Engineering, Vol. 111, No. 4, 2012, pp. 412-421
Online since: February 2014
Authors: Peng Wang, Ping Liao, Li Li Yue, Yue Song Wu
Numerical simulation results show that heat is the major factor that affects blade radial deformation.
Paper [3,4] manifested that radial deformation is the major influence factor of tip clearance design and control technology.
Radial deformation of a simple rotor blade had been discussed on nonlinear cascade in [8], results showed that heat was the major factor that contributed to blade body radial deformation.
Material properties are shown in Table 1.
Table 1 Material properties of turbine blade material properties value unit density 7780 kg·m-3 Specific heat capacity 663 J·(kg·K)-1 coefficient of heat conduction 29.1(400℃) W·(m·K)-1 coefficient of linear expansion 11.49(400℃) a×106 Poisson's ratio 0.3 elasticity modulus 205 GPa allowable tensile stress 457(400℃) GPa Fig. 3(a) Blade radial deformation Fig. 3(b) Blade Von Mises stress As shown in Fig. 3(a), blade radial deformation increases gradually along the blade height from bottom to top and the maximum deformation is 0.0815mm, which is located at the top suction surface.
Paper [3,4] manifested that radial deformation is the major influence factor of tip clearance design and control technology.
Radial deformation of a simple rotor blade had been discussed on nonlinear cascade in [8], results showed that heat was the major factor that contributed to blade body radial deformation.
Material properties are shown in Table 1.
Table 1 Material properties of turbine blade material properties value unit density 7780 kg·m-3 Specific heat capacity 663 J·(kg·K)-1 coefficient of heat conduction 29.1(400℃) W·(m·K)-1 coefficient of linear expansion 11.49(400℃) a×106 Poisson's ratio 0.3 elasticity modulus 205 GPa allowable tensile stress 457(400℃) GPa Fig. 3(a) Blade radial deformation Fig. 3(b) Blade Von Mises stress As shown in Fig. 3(a), blade radial deformation increases gradually along the blade height from bottom to top and the maximum deformation is 0.0815mm, which is located at the top suction surface.