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Online since: October 2012
Authors: Hui Peng, Shi Yong Mao, Shuai Liu, Qin Long Yan, Shao Lin Liu, Chong Yang Zheng
Influencing Factors and Control Method of the Stripping Time of Lining
The decision whether the template can be demolished or not need to be made in two steps.
The factors which influence on judging are as follows: the fallen, sinking, freeze-thaw damage, mechanical damage, water loss, discoloration, durability of change and so on.
(3)The stripping time should also be determined by factors that temperature in the hole influences growth of concrete intensity and cross-section form, span and exterior load of tunnel, and so on.
At the same time, the factors which affect steel trolley time such as overfilling in the top of tunnel, temperature stress etc. are analyzed by synthesis to ensure the concrete quality and construction safety, considering reserve a certain security reserving, taking insurance coefficient K is 1.25, so the stripping strength: σstrip = K σ max = 1.25 x 0.034 = 0.0425 MPa.[4] Determination of the Stripping Time.
According to the calculation above and taking all factors into account, the stripping time of side and roof arch steel trolley is determined as 12h.
The factors which influence on judging are as follows: the fallen, sinking, freeze-thaw damage, mechanical damage, water loss, discoloration, durability of change and so on.
(3)The stripping time should also be determined by factors that temperature in the hole influences growth of concrete intensity and cross-section form, span and exterior load of tunnel, and so on.
At the same time, the factors which affect steel trolley time such as overfilling in the top of tunnel, temperature stress etc. are analyzed by synthesis to ensure the concrete quality and construction safety, considering reserve a certain security reserving, taking insurance coefficient K is 1.25, so the stripping strength: σstrip = K σ max = 1.25 x 0.034 = 0.0425 MPa.[4] Determination of the Stripping Time.
According to the calculation above and taking all factors into account, the stripping time of side and roof arch steel trolley is determined as 12h.
Online since: June 2015
Authors: Sergio Neves Monteiro, Veronica Scarpini Candido, Carlos Mauricio Fontes Vieira, Juliana Simões Chagas Licurgo
The reduction in porosity contributes to improve the technological properties by reducing the water absorption and increasing the mechanical strength [7].
Until recent years the commercialization was not much affected whether the bricks comply or not with specifications.
Therefore, the objective of this work was to improve the technological properties of a local clay ceramic incorporated with glass polishing sludge and the fired at 900°C.
This promising result can also be attributed to the fluxing action of the GPS, which reduces the porosity and, consequently, improves the mechanical properties [7].
These factors are associated with the modern concept of a sustainable development that, in addition to the aforementioned advantages, also saves the clay as an important natural resource.
Until recent years the commercialization was not much affected whether the bricks comply or not with specifications.
Therefore, the objective of this work was to improve the technological properties of a local clay ceramic incorporated with glass polishing sludge and the fired at 900°C.
This promising result can also be attributed to the fluxing action of the GPS, which reduces the porosity and, consequently, improves the mechanical properties [7].
These factors are associated with the modern concept of a sustainable development that, in addition to the aforementioned advantages, also saves the clay as an important natural resource.
Online since: October 2015
Authors: Ján Duplák, Anton Panda, Miroslav Kormoš, Juraj Ružbarský
Technical science defines a lot of different factors, that they may be cause of shorter cutting tool lifetime.
For increase cutting tool durability is necessary maximally possible elimination of these factors.
The steel grade and the manufacturing processes used prior to surface induction-hardening dictate the properties in the unaffected area, which means that a combination of properties can be achieved in one component.
Material for workpieces is from specific material list with guaranteed chemical structure and mechanical properties - see Tables 1 and 2.
Zelenak et al, Comparison of mechanical properties of surface layers with use of nanoindentation and microindentation tests, Metalurgija 51/3 (2012) 309-312
For increase cutting tool durability is necessary maximally possible elimination of these factors.
The steel grade and the manufacturing processes used prior to surface induction-hardening dictate the properties in the unaffected area, which means that a combination of properties can be achieved in one component.
Material for workpieces is from specific material list with guaranteed chemical structure and mechanical properties - see Tables 1 and 2.
Zelenak et al, Comparison of mechanical properties of surface layers with use of nanoindentation and microindentation tests, Metalurgija 51/3 (2012) 309-312
Online since: July 2011
Authors: Mei Ling Tian, Jin Bao Wang, Xiao Qiao He, Yu Zhou Sun
Vibration properties of multi-layered graphene sheets
Meiling Tian1,a, Jinbao Wang1,b, Xiaoqiao He2,c, Yuzhou Sun3,d
1 School of Naval Architecture & Civil Engineering, Zhejiang Ocean University,
Zhoushan, 316000 China
2 Department of Building and Construction, City University of Hong Kong,
Tat Chee Avenue, Kowloon, Hong Kong
3 School of Civil Engineering and Architecture, Zhongyuan University of Technology,
Zhengzhou 450007 China
aeileen@zjou.edu.cn , bGamswang@yahoo.com.cn ,
cbcxqhe@cityu.edu.hk , dyuzhousun@yahoo.com.cn
Keywords: graphene sheet; vibration properties; van der Waals interaction
Abstract: Based on an explicit formula used for describing the van der Waals (vdW) interaction between any two layers of multi-layered graphene sheets (MLGSs), the vibration properties of five- and eight-layered graphene sheets are analyzed with considering the influence of vdW interaction on the natural frequences.
Successful production and unique physical properties of graphene sheets have stimulated great interest in exploration of possible applications.
Since 2004, many works have focused on studying the potential optical, electronic and mechanical properties and so on.
Bunch et al. [10] reported the fundamental frequencies and the quality factors of graphene resonators fabricated from single- and multi-layer graphene sheets by mechanically exfoliating thin sheets from graphite suspended over a SiO2 trench.
In this paper, the vibration properties of five- and eight-layered graphene sheets are analyzed with considering the influence of vdW interaction on the natural frequences using a continuum mechanical model.
Successful production and unique physical properties of graphene sheets have stimulated great interest in exploration of possible applications.
Since 2004, many works have focused on studying the potential optical, electronic and mechanical properties and so on.
Bunch et al. [10] reported the fundamental frequencies and the quality factors of graphene resonators fabricated from single- and multi-layer graphene sheets by mechanically exfoliating thin sheets from graphite suspended over a SiO2 trench.
In this paper, the vibration properties of five- and eight-layered graphene sheets are analyzed with considering the influence of vdW interaction on the natural frequences using a continuum mechanical model.
Online since: August 2016
Authors: Bozena Dohnalkova
The low resistance to actuation of corrosion factors is another disadvantage. [7]
This paper presents just a part of laboratory testing of project devoted to finding an optimum solidification formula with use of cement for hazardous waste – neutralization sludge – by monitoring a short-term properties of the solidification process product in time and by studying the micro structure of the solidification process product.
Subsequently the identification of waste properties was carried in accordance with Regulation no. 294/2005 .
Very important will be the monitoring of the properties in time because as it was shown in compressive strength monitoring after 28 days and 60 days, that compressive strength decreased with time at most of formulas, which can signify the degradation of some properties of test specimen in time.
[4] MALVIYA, R.; CHAUDHARY, R.: Factors affecting hazardous waste solidification/stabilization: A review, Journal of Hazardous Materials 137. 2006, pp.267-276
Factors affecting hazardous waste solidification/stabilization: A review, J.
Subsequently the identification of waste properties was carried in accordance with Regulation no. 294/2005 .
Very important will be the monitoring of the properties in time because as it was shown in compressive strength monitoring after 28 days and 60 days, that compressive strength decreased with time at most of formulas, which can signify the degradation of some properties of test specimen in time.
[4] MALVIYA, R.; CHAUDHARY, R.: Factors affecting hazardous waste solidification/stabilization: A review, Journal of Hazardous Materials 137. 2006, pp.267-276
Factors affecting hazardous waste solidification/stabilization: A review, J.
Online since: February 2013
Authors: Zeng Hong Wang, Chong Hui Zhu
Cement soil strength properties [D].
Unconfined compression strength of cement soil factors affecting indoor experimental study [J].Geotechnical Investigation &Surveying, 2005, (3), 8-10
Study on engineering properties of cement-stabilized soil [J].
Experimental study on mechanical properties of cement soil [J].Railway construction, 2001, 8, 31-32
Experimental study on properties of cement soil [J].
Unconfined compression strength of cement soil factors affecting indoor experimental study [J].Geotechnical Investigation &Surveying, 2005, (3), 8-10
Study on engineering properties of cement-stabilized soil [J].
Experimental study on mechanical properties of cement soil [J].Railway construction, 2001, 8, 31-32
Experimental study on properties of cement soil [J].
Online since: May 2016
Authors: Xin Luo
Charpy impact test is very sensitive to mechanical processing technologies and product defects.
The center of percussion is different from the designed center of strike and this difference can affect the vibration energy on the pendulum.
Charpy impact test is the most widely used method to test the dynamic properties of materials.
Energy that is lost through other factors is not intended to be included in the measured Charpy energy.
The pendulum vibration energy is one of the important factors affecting the measuring accuracy of the impact absorbing energy, so reducing the vibrational energy of the pendulum can be used to improve the measurement accuracy of the Charpy impact test.
The center of percussion is different from the designed center of strike and this difference can affect the vibration energy on the pendulum.
Charpy impact test is the most widely used method to test the dynamic properties of materials.
Energy that is lost through other factors is not intended to be included in the measured Charpy energy.
The pendulum vibration energy is one of the important factors affecting the measuring accuracy of the impact absorbing energy, so reducing the vibrational energy of the pendulum can be used to improve the measurement accuracy of the Charpy impact test.
Online since: May 2011
Authors: Xin Yi Huang, Yan Li
The results show that impact factors of the bridge increase as surface roughness deteriorated; the impact factor varies obviously for the different component; the tension impact factor of the short suspender is larger than that of long ones; damping ratio of structure has little effect on the impact factors.
Impact Factors of Displacement and Cable Tension.
Fig.6 Impact factors of the arch ribs in mid span Fig.7 Impact factors of main girder in mid span From Fig.8 can be seen that the resonant frequencies rather approach to the 3rd, 5th and 9th bending vibration mode of the bridge, while at other velocities the resonant frequencies deviate those causing the deflection impact factors descending greatly.
Fig.10 Impact factors of axial force of cable 1 Fig.11 Impact factors of axial force of cable 8 Conclusions The dynamic properties for a crescent-shape heterotypic CFST bridge due to moving vehicle are investigated.
Mechanical vibration-Road surface profiles Reporting of measured data.
Impact Factors of Displacement and Cable Tension.
Fig.6 Impact factors of the arch ribs in mid span Fig.7 Impact factors of main girder in mid span From Fig.8 can be seen that the resonant frequencies rather approach to the 3rd, 5th and 9th bending vibration mode of the bridge, while at other velocities the resonant frequencies deviate those causing the deflection impact factors descending greatly.
Fig.10 Impact factors of axial force of cable 1 Fig.11 Impact factors of axial force of cable 8 Conclusions The dynamic properties for a crescent-shape heterotypic CFST bridge due to moving vehicle are investigated.
Mechanical vibration-Road surface profiles Reporting of measured data.
Online since: December 2013
Authors: M.M.H. Megat Ahmad, Md Radzai bin Said, Mohd Yuhazri bin Yaakob, H. Sihombing, U. Nirmal, Teng Teng Tan Jennise
By applying appropriate manufacturing technique for laminated composite, the curing condition of the laminate is one of the factors that will influence the properties of composite.
Mechanical and physical properties may be different when the laminated composite is cured at different angle position.
The behavior of the load bearing composite under the tensile load is mainly dependent on the factors of stiffness and strength of the fibers [12].
From the data, SN4 (45˚) did not gave a good mechanical properties for the laminated composite to be cured at this angle as the behaviour of the composite will be changed sharply than control sample.
Kumar, Mercerization of flax fiber improves the mechanical properties of fiber-reinforced composites, Int.
Mechanical and physical properties may be different when the laminated composite is cured at different angle position.
The behavior of the load bearing composite under the tensile load is mainly dependent on the factors of stiffness and strength of the fibers [12].
From the data, SN4 (45˚) did not gave a good mechanical properties for the laminated composite to be cured at this angle as the behaviour of the composite will be changed sharply than control sample.
Kumar, Mercerization of flax fiber improves the mechanical properties of fiber-reinforced composites, Int.
Online since: September 2020
Authors: Minh Tai Le, Van Vinh Hoang, Pham Son Minh
Accordingly, in this paper, the parameters affecting product quality are analyzed.
Control factors and process-parameter levels.
The effect of control factors on S/N ratio and their respective levels are shown in Table 6.
Based on Fig. 2, the optimal level of control factors is A3B2C3D3E1F1.
Influence of mechanical properties of the sheet material on formability in single point incremental forming, CIRP Ann-Manuf.
Control factors and process-parameter levels.
The effect of control factors on S/N ratio and their respective levels are shown in Table 6.
Based on Fig. 2, the optimal level of control factors is A3B2C3D3E1F1.
Influence of mechanical properties of the sheet material on formability in single point incremental forming, CIRP Ann-Manuf.