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Online since: June 2019
Authors: Rudolf Hela, Karel Mikulica
Introduction
If we want to extend the life of any product, we must take care of it, maintain a maintenance plan, and avoid unnecessarily affecting the degradation.
Lithium silicate reacts with calcium hydroxide in the concrete to form a solid, insoluble calcium silicate structure that causes greater concrete density and greater resistance to mechanical grinding and therefore dustiness. [3] Materials and Methods The advantages of sealants are increased resistance to frost, reduced water infiltration and aggressive chemicals such as chlorides.
There is usually a lack of verification of laboratory results under site conditions and the quality of the concrete and the covering layer should not be reduced. [1] As noted above for comparing the properties of selected lithium silicate-based curing coatings, we have chosen the widely abrasive abrasion method according to Böhm to evaluate the measu red values according to two standards.
This method may not be accurate because a human factor enters the measurement, where we may not always be able to measure a given thickness loss at the same location, so there are much greater differences.
Lithium silicate reacts with calcium hydroxide in the concrete to form a solid, insoluble calcium silicate structure that causes greater concrete density and greater resistance to mechanical grinding and therefore dustiness. [3] Materials and Methods The advantages of sealants are increased resistance to frost, reduced water infiltration and aggressive chemicals such as chlorides.
There is usually a lack of verification of laboratory results under site conditions and the quality of the concrete and the covering layer should not be reduced. [1] As noted above for comparing the properties of selected lithium silicate-based curing coatings, we have chosen the widely abrasive abrasion method according to Böhm to evaluate the measu red values according to two standards.
This method may not be accurate because a human factor enters the measurement, where we may not always be able to measure a given thickness loss at the same location, so there are much greater differences.
Online since: September 2013
Authors: David John Smith, Matthew J. Peel, Danie G. Hattingh, Thomas Connolley, Greame Horne, Shu Yan Zhang, Joe Kelleher, Michael Hart
Specifically, the elastic follow-up
factor is the ratio of plastic strain to the corresponding elastic strain reduction.
This affected both the overall length of the specimen and gripping arrangements, and the maximum cross-sectional area to allow sufficient stress to be applied.
The as-received material had the following material properties: Young's modulus, 72 GPa; Poisson's ratio 0.33; and yield stress, 145 MPa... 150 mm . 3 mm . 100 mm . 22 mm .
This reduction, although in the order of 30 MPa, is over a sufficiently small area not to affect the macro-scale response.
The elastic follow-up factor is approximately 2 before net section yielding occurred.
This affected both the overall length of the specimen and gripping arrangements, and the maximum cross-sectional area to allow sufficient stress to be applied.
The as-received material had the following material properties: Young's modulus, 72 GPa; Poisson's ratio 0.33; and yield stress, 145 MPa... 150 mm . 3 mm . 100 mm . 22 mm .
This reduction, although in the order of 30 MPa, is over a sufficiently small area not to affect the macro-scale response.
The elastic follow-up factor is approximately 2 before net section yielding occurred.
Online since: June 2014
Authors: Ying Jeh Huang, Ming Wei Shao
Result and Discussion
Comparison of physicochemical property.
1.
Although combustion efficiency and performance of internal combustion engine may be slightly affected, this situation can be ignored, and might be found in some advanced electronic combustion boilers.
In the future commercial use, improvement of safety of relevant storage devices and conveying equipment should be considered, and due to similar properties, no modification is made to any elements, and the periodic maintenance of internal combustion engine will not be adjusted.
The Key-Factor Modulation of Waste Tire Pyrolysis in Resource Chemical Plant for Recovered Fuel Production: Advanced Materials Research Vol. 852 (2014), p.768 [2] Wu, M.T.: A Study on Distribution Analysis and Reuse of Waste Tires, National Taipei University of Technology, Institute of Environmental Engineering and Management. (2011) [3] Tsai, H.H. : The Study of the Relationship between Exhaust Emission and Fuel Spray Combustion Characteristics of Tire Pyrolysis Oil in Diesel Engine (2012) [4] Kuo, C.H.: A Study on Combustion Characteristics of Tire Pyrolysis Oil in Diesel Engine, National Chung Cheng University, Institute of Mechanical Engineering. (2010) [5] Chang, Y.W.
A: Study on Gas Contamination from Combustion of Mixed Biomass Oil in Diesel Engine, National Chung Cheng University, Institute of Mechanical Engineering. (2009) [6] K.
Although combustion efficiency and performance of internal combustion engine may be slightly affected, this situation can be ignored, and might be found in some advanced electronic combustion boilers.
In the future commercial use, improvement of safety of relevant storage devices and conveying equipment should be considered, and due to similar properties, no modification is made to any elements, and the periodic maintenance of internal combustion engine will not be adjusted.
The Key-Factor Modulation of Waste Tire Pyrolysis in Resource Chemical Plant for Recovered Fuel Production: Advanced Materials Research Vol. 852 (2014), p.768 [2] Wu, M.T.: A Study on Distribution Analysis and Reuse of Waste Tires, National Taipei University of Technology, Institute of Environmental Engineering and Management. (2011) [3] Tsai, H.H. : The Study of the Relationship between Exhaust Emission and Fuel Spray Combustion Characteristics of Tire Pyrolysis Oil in Diesel Engine (2012) [4] Kuo, C.H.: A Study on Combustion Characteristics of Tire Pyrolysis Oil in Diesel Engine, National Chung Cheng University, Institute of Mechanical Engineering. (2010) [5] Chang, Y.W.
A: Study on Gas Contamination from Combustion of Mixed Biomass Oil in Diesel Engine, National Chung Cheng University, Institute of Mechanical Engineering. (2009) [6] K.
Online since: March 2011
Authors: Xiao Lun Liu, Wei Sun, Song Ding, Jian Fang Liu, Yu Ying Wang, Bin Jiang
A mechanical transmission was driven by the three chains (Figure 1).
Conclusion Through the test of noise comparision, noise mechanism of bush roller chains was studied, a method was proposed to reduce noise of bush roller chains, and low noise properties of duplex bush roller chains with split rollers were further verified and the following conclusions were made: 1.
All the factors that enhanced impact momentum had a positive effect on the noise. 2.
Mechanical Design, 1994, 11 (3): 22-24
ASME Journal of Mechanical Design, 1996, 118(4): 538-543.
Conclusion Through the test of noise comparision, noise mechanism of bush roller chains was studied, a method was proposed to reduce noise of bush roller chains, and low noise properties of duplex bush roller chains with split rollers were further verified and the following conclusions were made: 1.
All the factors that enhanced impact momentum had a positive effect on the noise. 2.
Mechanical Design, 1994, 11 (3): 22-24
ASME Journal of Mechanical Design, 1996, 118(4): 538-543.
Online since: December 2012
Authors: Guan Jun Bao, Peng Cheng Huang, Qing Hua Yang, Li Bin Zhang
When the joint damping coefficient is increasing, this value will also increase.
1 Introduction
Different actions of mechanical hand (finger) are achieved by combining different movement of each driving joint.
The former is mechanical structure and driven by motor, while the latter combines flexible and pneumatic actuator.
Consequently, in recent 20 years, researchers gradually focus on the mechanical hand (finger) driven by this kind of actuator.
But its bending property is affected by parameters of rigid structure, property and parameters of FPA and some other factors.
Conf. on Micro Electro Mechanical Systems.
The former is mechanical structure and driven by motor, while the latter combines flexible and pneumatic actuator.
Consequently, in recent 20 years, researchers gradually focus on the mechanical hand (finger) driven by this kind of actuator.
But its bending property is affected by parameters of rigid structure, property and parameters of FPA and some other factors.
Conf. on Micro Electro Mechanical Systems.
Online since: June 2013
Authors: Nicolae Bâlc, Gheorghe Achimas, Florica Mioara Serban, Cristea Ciprian
One of the factors that affect the quality of bent parts is springback.
The amount of springback depends on many factors including the material properties (Young’s modulus, Poisson’s ratio, strength coefficient, yield stress, strain hardening and anisotropy coefficients), bending operation (tooling geometry, pad force, clearance, initial bend angle and bend radius, contact friction condition etc).
The drawback of the analytical models is that they are formulated with significant simplifications of process conditions and material properties which can considerably affect the accuracy of the results.
Table 1 Mechanical parameters determined by uniaxial tensile tests Denomination Experimental value Young's modulus E=2,1*105 [N/mm2] Poisson's ratio ν = 0,3 Coefficients of Swift's hardening law (see Eq.(2)) K=532 [N/mm2] ε0=0.00778 n=0,258 The finite element mesh used to discretize the raw part had: 26 equidistant nodes and 25 finite elements B21 (Beam elements with two nodes).
Takuda, Finite-element simulation of springback in sheet metal forming using local interpolation for tool surfaces, International Journal of Mechanical Sciences 50 (2008) 175–192
The amount of springback depends on many factors including the material properties (Young’s modulus, Poisson’s ratio, strength coefficient, yield stress, strain hardening and anisotropy coefficients), bending operation (tooling geometry, pad force, clearance, initial bend angle and bend radius, contact friction condition etc).
The drawback of the analytical models is that they are formulated with significant simplifications of process conditions and material properties which can considerably affect the accuracy of the results.
Table 1 Mechanical parameters determined by uniaxial tensile tests Denomination Experimental value Young's modulus E=2,1*105 [N/mm2] Poisson's ratio ν = 0,3 Coefficients of Swift's hardening law (see Eq.(2)) K=532 [N/mm2] ε0=0.00778 n=0,258 The finite element mesh used to discretize the raw part had: 26 equidistant nodes and 25 finite elements B21 (Beam elements with two nodes).
Takuda, Finite-element simulation of springback in sheet metal forming using local interpolation for tool surfaces, International Journal of Mechanical Sciences 50 (2008) 175–192
Online since: April 2011
Authors: Aude Boudelier, Mathieu Ritou, Sebastien Garnier, Benoît Furet
These operations are often difficult due to composite mechanical and thermal properties: heterogeneity, anisotropy and low thermal conductivity [1,2].
The predominant factor influencing Sa-parameter is grits size.
Consequently, mechanical properties of the material are affected and chips removal becomes easier.
This value depends also on other factors such as material bulking.
Grit size and feed per revolution are also key factors to assure required surface roughness and improve productivity, respectively.
The predominant factor influencing Sa-parameter is grits size.
Consequently, mechanical properties of the material are affected and chips removal becomes easier.
This value depends also on other factors such as material bulking.
Grit size and feed per revolution are also key factors to assure required surface roughness and improve productivity, respectively.
Online since: April 2015
Authors: Abdelkhalak El Hami, Bouchaib Radi
In this work, we will be limited to the parameters on the properties of materials and the load.
A variation of these parameters can affect the stability of the process and the emergence of some plastic instability.
Second, it assumes that the FLC varies according to normal which can give us an idea on the variation of this probability in the case or the location and shape of the FLC is affected.
Reliability Analysis of a mechanical contact between deformable solids.
I J Mechanical Sciences 2005; 47:333–358
A variation of these parameters can affect the stability of the process and the emergence of some plastic instability.
Second, it assumes that the FLC varies according to normal which can give us an idea on the variation of this probability in the case or the location and shape of the FLC is affected.
Reliability Analysis of a mechanical contact between deformable solids.
I J Mechanical Sciences 2005; 47:333–358
Online since: May 2016
Authors: Qing Jian Liu, Yong Wang, Yu Long Wang, Jiang Deng, Jin Hai Huo, Zhi Qiang Yu, Wang Tai Yong
Considering a weighting factor and taking integrated natural frequency of the column as an optimization objective, the mass of the column as a constraint, an optimization equation is established.
For finite element analysis, all the materials have the properties: young’s modulus, Poisson’s ratio, and density .the vibration mode shapes associated with the frequencies of the column were obtained from modal analysis.
Currently, information on how the response of a structure is affected by changes of the variables that define its shape plays an important role in structural shape optimization.
Dynamics simulation analysis of column for large-scale NC gear hobbing machines [J], Chinese Journal of Mechanical Engineering, 2013,24(11)1473~1478
Study on method for weak link identification of dynamic stiffness of a machine tool and optimization design[J], Journal of Mechanical Engineering, 49(2013)11~17
For finite element analysis, all the materials have the properties: young’s modulus, Poisson’s ratio, and density .the vibration mode shapes associated with the frequencies of the column were obtained from modal analysis.
Currently, information on how the response of a structure is affected by changes of the variables that define its shape plays an important role in structural shape optimization.
Dynamics simulation analysis of column for large-scale NC gear hobbing machines [J], Chinese Journal of Mechanical Engineering, 2013,24(11)1473~1478
Study on method for weak link identification of dynamic stiffness of a machine tool and optimization design[J], Journal of Mechanical Engineering, 49(2013)11~17
Online since: April 2011
Authors: Yong Xing Tong, Le Gu, Li Qin Wang, Bo Peng
The results showed that the properties of different ceramic materials cause the difference in wear behaviors.
Introduction Structural ceramics have useful tribological properties, such as low density, high corrosion resistance, low coefficient of friction, low thermal expansion and high hardness over a wide range of temperature.
The friction and wear properties of the ceramics against bearing steel under vacuum environments have not yet carried out in detail.
All these factors resulted in very high temperatures on the rubbing surfaces, especially on the rubbing ceramic surface, which caused the ceramics grains to melt.
The results showed that the properties of the counter material cause the difference in friction and wear characteristics.
Introduction Structural ceramics have useful tribological properties, such as low density, high corrosion resistance, low coefficient of friction, low thermal expansion and high hardness over a wide range of temperature.
The friction and wear properties of the ceramics against bearing steel under vacuum environments have not yet carried out in detail.
All these factors resulted in very high temperatures on the rubbing surfaces, especially on the rubbing ceramic surface, which caused the ceramics grains to melt.
The results showed that the properties of the counter material cause the difference in friction and wear characteristics.