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Online since: May 2016
Authors: Martin Moravcik, Lukas Krkoska
It can also cover the other structural effects for example the temperature influence which can significantly affect to the later structural behavior.
For the stress analysis of such non-homogenous structures where the basic concrete properties and the structural scheme were varying on the structure within the time (e.g. cantilever construction method) is particularly recommended Annex KK.101, of the Eurocode 2 approach [4].
As the main purpose of the laboratory tests were acquiring the real values of the concrete basic mechanical properties and to verify the time development magnitude of time dependent strains due to the concrete creep and shrinkage effects.
The basic mechanical parameters of concrete were gained for the 7, 14 and 28 days age of concrete.
Temperature and relative humidity are important environmental factors which are affecting to the axial stresses distribution.
Online since: July 2011
Authors: Jia Liang Guan, Y.C. Wu, Z.D. Chen, H.W. Lu, X.H. Xiao
The experiments prove surface quality of the work piece was guaranteed by ELID grinding, and which was also greatly affected by some parameters in lapping and polishing such as pressure, rotational speed.
A precision mirror surface roughness of Ra 11nm was obtained after ELID precision grinding and traditional mechanical lapping experiments.
The temperature of grinding zone is higher than ordinary steel which is the causation of low thermal conductivity. 3) The wheel easily adhesion plug The grinding wheel abrasive wear is serious in the high temperature and big force of grinding; grindings are easy to adhere to the wheel, which make the grinding effect of abrasive incapable. 4) Difficult to guarantee the quality of grinding surface In grinding, these factors listed and the easily passivation wheel make the high-temperature alloy surface stress larger, easily burn, alligator crack, the surface integrity is difficult to guarantee[1].
The chemical constitution and mechanical property of W-Mo alloy is listed in Table 1.
Table 1 The chemical constitution and mechanical property of W-Mo alloy Material Chemical constitution Mechanical property W-Mo alloy W Mo Ni Fe σb σ0.2 HB 80 15 2.5 2.5 680N[mm2] 650N[mm2] 210 Table 2 The experimental installation ELID grinding condition Machine MSG-612CNC-FA grinding machine Wheel Cast iron bonded diamonds wheel (W36, W10, W5, W1.5) Power source Special dc pulse supply Grinding fluid Special grinding fluid[5] Polishing condition Producing machine Conversion speed regulation optics biaxial polishing machine Polishing pad Thin blanketing or cotton fabric Polishing fluid Ⅰ White alundum(grain size W1)+40 times coal oil + little animal oil and seed oil Ⅱ Diamond(grain size W0.5)+ 45 times coal oil + lubricant grease and seed oil Measure machine HALIANG2205 surface roughness admeasuring apparatus
Online since: September 2006
Authors: Igor S. Golovin
Therefore the next stage of HDM development is to consider their damping capacity in connection with other mechanical properties.
As another combination of properties the loss coefficient (Q -1) vs.
As a rule-of-thumb, the mechanism responsible for damping should not be identical to the mechanism controlling their mechanical properties like yield strength.
Levin, Elastic and damping properties of metallic materials, Metallurgiya, Moscow, 1987 (in Russian)
Golovin, in: Quasicrystals, Structure and Physical Properties, ed. by H.
Online since: February 2019
Authors: Koji Mimura, Tsutomu Umeda
The formation of shear bands is an unstable phenomenon that is greatly affected by the initial imperfection.
In this model, on the other hand, the temperature or the strain rate also affects the yield behavior considerably.
The mechanical properties of those materials are greatly different from those of crystalline metals, whose elementary process comes from the dislocation movement.
This model also implies that the strain rate affects the fracture behavior and the stress–strain relationship.
Yishikawa, Journal of the Japan Society of Mechanical Engineers. 79-808 (2013) 1807-1817 (in Japanese)
Online since: November 2010
Authors: Kai Xue, Jia Tai Zhang, Qiu Hong Li, Ping Wang
It is single-piece production, so the various factors affecting the precision need be fully considered during designing.
In order to stimulating the mechanical behavior and stress distribution of screws to the greatest extent, the connection parts between the U frame and the screw or the nut are set touch and connect, and then the nonlinear contact model is analyzed [3,4].
The relevant material parameters for the U frame of the simulation turntable is shown as in table 1, and in the table the connecting screws are M12 standard steel screws which mechanical property is 8.8.
While assurance factor is selected 1.5, admissible stress is 154Mpa.
Vol. 34(4) (2007), p. 23 [2] Xia Wei-ming, Zhang xiang, Yang Xiao-jun: Machinery Design & Manufacture, No.7 (2009), p. 42 [3] Raju Sethuraman, T.Sasi Kumar: Jounal of Mechanical Design.
Online since: September 2022
Authors: Hong Liang Hou, Xiang Xue, Su Na Cha, Yasir Abbas, Zhi Yong Zhao, Shao Jun Wu
Afterward, the electrothermal, mechanical properties, and performance stability of these carbon nanotube films were investigated, along with mechanism analysis.
Stability of mechanical properties Previously, investigation of mechanical properties of CNTFs did not tend to be taken into consideration after repeated electrical heating, under the circumstances, mechanical measurements of CNTFs treated by various ways were performed and the variation trend was revealed before and after repeated electrical heating.
Therefore, a similar promotion of mechanical properties of the CNTFs by densification treatments was observed in Fig. 11 and 12, and property stability was also received, which was one of the practical conditions for CNTF as a heater application, especially it is very important for the CNTF-Sa with significantly elevated electrothermal properties, which did not exhibit degradation of mechanical properties after electrical heating compared to the CNTF-Sa before electrical heating and the CNTFs treated by other methods.
Graupner, et al., Effect of SOCl2 Treatment on Electrical and Mechanical Properties of Single-Wall Carbon Nanotube Networks, J.
Inoue, Fabrication and mechanical properties of carbon nanotube yarns spun from ultralong multi-walled carbon nanotube arrays, Carbon. 50 (2012) 4579-4587
Online since: July 2014
Authors: Li Li Xiong, Ni Hu, Hao Li
Both of them involve unsafe factors, such as human, objects, environment.
The focuses on hazard analysis are analyzing risk source I with active mechanical properties, such as foundation settlement, load, and explosion, designing, calculating, and setting up temporary structures and other safety precautions, to guarantee construction safety.
Foundation pit engineering emergency plan Since foundation pit construction is extremely complicated with many factors affecting safety, appropriate emergency measures must be ready to cope with adverse circumstance.
In addition, the competent government departments should further strengthen supervision and improve relevant examination system from the source to eliminate unsafe factors in safety special construction.
Online since: July 2011
Authors: Shu Ming Xing, Pei Wei Bao, Shi Bo Bin
Study on Distribution of TiC Particles in Molten Steel under Electromagnetic Stirring Condition Bin Shibo1,a,Xing Shuming1,b and Bao Peiwei1,c 1School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong university, China a09116335@bjtu.edu.cn,bsmxing@bjtu.edu.cn,c pwbao@bjtu.edu.cn Keywords: Electromagnetic stirring; Unit stirring power; Reinforcement; Distribution Abstract.
The influencing factors on distribution such as the unit stirring power(P), the styles of TiC particles addition and the methods of surface pretreatment had been studied in our experiments.
However, the heterogeneous distribution of reinforcement directly affects the composite’s organizational structure and usability[4].
Table 2 Distribution effect of TiC particles in steel matrix Distribution effect P(KW/Kg) U (mm) (mm) Influencing factors Decreasing tendency of P 7.0 1.81 3.27 3.20 6.0 1.46 3.45 5.0 1.13 3.31 4.0 1.35 3.55 Increasing tendency of P 4.0 1.22 3.86 5.0 1.58 3.45 6.0 1.43 3.50 7.0 1.55 3.65 Styles of addition Impendency addition 2.63 4.12 precastblock addition 1.36 4.17 Bottom injection addition 1.15 3.32 Influencing factors on particles distribution Effect of stirring power on distribution Fig.1 is the metallographic structure of PRSMC with P showing decreasing tendency, and Fig.2 shows the case of P increasing.
:Special Casting and Non-ferrous Alloy Vol.28(2008),p.581 [9] Han zhicheng.: Journal of North China University of Technology Vol.6(1994),p.34 [10] TAKAMICHI IIDA, RODERICK I.L.GUTHRIE(coauthors).Xian aiping, Wang lianwen(translators), physical properties of liquid metal.
Online since: October 2011
Authors: Zhi Qing Zhang, Kui Hua Wang, Wen Bing Wu, Deng Hui Wu
At last, by using parametric study method, the influence of sediment properties on complex impedance at rock-socketed pile head is studied.
It is shown that sediment properties have significant influence on complex impedance at the head of rock-socketed pile.
Introduction In the construction process of rock-socketed pile constructed by mechanical borehole method, the quality of pile toe embedded into bedrock is an important factor.
On the one hand this quality is due to the bedrock properties and the embedded depth of pile toe into bedrock, on the other hand this quality is controlled by the sediment properties under the pile toe.
Then, the influence of sediment properties on complex impedance is carefully investigated by using parametric study method.
Online since: July 2011
Authors: Ping Jie Cheng, Han Zhou Hu, Shu Guang Hu
In the general atmosphere, the most important factor affecting concrete durability is chemical action.
(2)[2] Where: 𝑘𝑗 is the corner correction factor; 𝑘𝑐𝑜2 is the C02 concentration factor; 𝑘𝑝 is the casting surface correction factor; 𝑘𝑠 is working stress coefficient; T is temperature (℃{TTP}8451 ): RH is relative humidity (%).
The above two equations are both raised by Niu Di-Tao, on consideration of factors, (2) is more detailed and applicability better than (1).
Although fcuk is a mechanical indicator, and is not closely linked with the physical and chemical process of concrete carbonation, but the compressive strength is the comprehensive reflection of the water-cement ratio, admixtures, curing conditions, construction quality and other factors and easy to measure, therefore, it is an effective and practical method to predict the carbonation depth with fcuk
The mechanical properties of steel rust [1].
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