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Online since: November 2015
Authors: Xiao Hong Zhou, Lei Zhang, Zhu Zhan
And the mechanical property of the silicone layered with the fabric was also measured.
Nevertheless the polyester fiber has been the structure of micro fiber and its surface is inert, not only causing interface properties of polyester fabric and rubber matrix lowly, but also they affected the polyester fabric as skeleton material mechanical performance.
The properties of silicone rubber are shown in Table 2.
In Table 5, mechanical properties of silicone layered with high-performance polyester fabric processed by the cold plasma treated are increased significantly.
Wei, The composite properties of Atmospheric pressure plasma processing aroma fiber and rubber [J].
Online since: October 2010
Authors: Bo Xu, Sheng Juan Li, Shu Lin Wang, Lai Qiang Li
We first prepared modified electrode material by dry roller vibration milling method and investigated the properties of electrode materials prepared by different manufacturing techniques and their microstructure evolution.
The analysis showed the impression of surface area, pore volume and pore size along with three factors.
For pore size none of three factors affected distinctly.
Table 1 Level of Factors in Experiments Factor Lever A B C Milling time ,t [h] Additive [15%] Excited frequency, f [rpm] 1 1 Graphite 700 2 3 MnO2 800 3 5 Boric acid 900 Fig.5 Sketch of porous structure of electrode material:a-MnO2 electrode; b-Activated carbon Conclusion We used for the first time the roller vibration milling to prepare active carbon (AC) nano-particles in dry mode and at room temperature.
On the other hand, we analyzed different preparation factors by orthogonal experiment and found the porous MnO2 is desirable additive of active carbon.
Online since: January 2011
Authors: Wei Guo Guo, Xiao Qiong Zhang, J. Su
In this study, several different types of mechanical tests are carried out.
It has been known that the final degree of orientation strongly affects both the optical and mechanical properties of the polymer.
To check mechanical isotropic behavior of DM-3, the quasi-static unixial compression tests were carried out.
The samples possess two stress concentration factors (Kt), they are 2.0 and 3.0 respectively.
This naturally leads DM-3 to have an anisotropic property, as seen in Fig 2.
Online since: March 2010
Authors: Ying Chun Liang, Qing Shun Bai, Kai Yang, W.Q. Chen
The three-dimensional coupled thermal-mechanical finite element model is adopted to determine the effects of varying depth of cut on cutting temperature considering size effects.
Cutting temperature distributions and heat generation at the tool-chip interface in metal machining have been recognized to be the major factors affecting the tool performance and the workpiece geometry or properties.
The thermo mechanical properties for the workpiece material are given in Table.1.
The global distribution of transient temperature T in a 3D coupled thermo-mechanical Table 1 Thermo mechanical properties of workpiece Material Density ρ (g/cm3) Modulus of elasticity E (GPa) Poisson's ratio Specific heat capacity C (J/g﹒ºC) Thermal conductivity κ (W/m﹒K) Thermal expansion α (µm/m﹒ºC) AL 2024-T6 2.78 73.1 0.33 0.875 121 23.2 analysis, is given by t T CQ z T y T x T ∂ ∂ =+ ∂ ∂ + ∂ ∂ + ∂ ∂ ρ κ &) ( 2 2 2 2 2 2 (2) Where Q& is the rate of specific volumetric heat flux and t the time.
The variations of temperature distributions are consistent with the simulation results. 0.5mm No chips occur Tool Rotation Workpiece v Temperature analysia area 0.5mm Interrupted chip 0.5mm Continuous chip a)ap=1.5µm b) ap=5µm c) ap=20µm Fig. 5 The IR image of temperature distribution considering various depth of cut Conclusions A new coupled thermo-mechanical finite element model was developed for micro-end-milling of aluminum alloy Al2024-T6.
Online since: November 2015
Authors: Stefan Velicu, Paul Liviu Păunescu, Ionel Păunescu
Among them we can mention: manifestation of breakage of fine particles in the vicinity of the free surface of screw outer zone, energy state and multiplication of dislocations in various superficial zones, influence of surface roughness on the resistance to wear, influence of oxide films and special coatings or of liquid environment on certain physical and mechanical properties of the superficial layer.
The following elements can be observed: A – upper element, B – lower element, ; a – zone of plastic deformation; b – zone with destroyed structure, c - zone of elastic deformation, 1- lubricating material interposed between elements A and B, 3 - microscopic particles produced in the process of wear; 4 – areas on the upper and lower element respectively that will enter directly in interaction; 5 – area with heavily modified physical and mechanical properties; 6 – representation of the limits of variation of the momentary speed values of various areas of fluid [1].
The quality of the oil in a compressor [12] can be affected by three main factors, namely: a) wear: solid microscopic particles of oil and particles detached from moving parts can cause the wear of the component elements, reducing the life of the compressor; b) chemical properties: abnormal viscosity because of oil temperature changes caused by moisture or high levels of acidity, resulting from internal chemical reactions (alteration of refrigerant or hydrolysis of oil).
The dimensions of the layers shown in figure no. 4 depend on a number of factors of the metal that constitute the compressor components and also of a number of factors exterior to the system.
Conclusions The most detailed knowledge of the superficial layer structure of the metallic elements of a compressor allows identifying the mechanisms that explain the response of the material to the generally destructive action of some exterior factors such as the mechanical, chemical or thermal factors.
Online since: December 2014
Authors: Michal Hatala, Ján Duplák, Marek Kočiško, Miroslav Mičko, Miroslav Kormoš, Mohammed J.A. Alowa
Specification cutting tools durability made of cutting ceramic in machining process of steel 80MoCrV4016 is very important for economics of small and medium-sized enterprises, because cutting tool durability is factor that significantly affects the budget of these enterprises.
Material for workpieces is from specific material list with guaranteed chemical structure and mechanical properties.
Tab. 1 Chemical structure of 80MOCRV4016 Chemical structure [%] C Mn Si Cr Mo V ≤ 0,85 ≤ 0,35 ≤ 0,25 3,75-4,25 4,00-4,50 0,90-1,10 Tab. 2 Mechanical properties of 80MOCRV4016 Mechanical properties of C45 Rm [MPa] A5 [%] HB Rp0,2 [Mpa] 735 28 199 410 Technological conditions used for experiments vc = 20 - 700 m.min-1; ap = 0,2 mm; f = 0,1 mm ; re= 0,8mm; kr=80°; k´r=10°; VB = 0,3 mm; Fig. 5 The turning process with cutting tool made of Al2O3 Fig. 6 T-vc dependence for Al2O3 in logarithmic scale Fig. 7 T-vc dependence for Al2O3 + ZrO2 in logarithmic scale Fig. 8 T-vc dependence for Al2O3 + TiCN in logarithmic scale Conclusion Every technological operation in engineering is characterized by different specific factors.
Material for cutting tools defines their machining properties.
Testing properties of those materials are very important, because their properties may be different than properties defined in standards ISO.
Online since: June 2010
Authors: Maria Vallet-Regí, Miguel Manzano, M. Vila
These materials are not only useful because of their structural, chemical, physical or mechanical properties; they can also perform an action within a process.
The tube diameter and wrapping angle, by means of their chirality, affect its conductance, density, lattice structure, and other properties.
Also, it has been important the research in covalent binding of biologically active molecules, as the functionalization during the processes has to be maintained. 2.1 Mechanical Reinforcement Significant changes can be induced in the mechanical properties of materials by the introduction of a small amount of CNTs.
An effort of improving the mechanical properties of these coatings is being done.
Textural properties of pure SBA-15 and 2-0, 2-20 and 2-90 composite materials.
Online since: January 2012
Authors: Shi Guo Du, Hai Ping Cui, Ming Qiu Wang, Jun Yan
The effect of these factors such as time and copper salt concentration on the film component and surface resistivity was analyzed.
Being plated with non crystal alloy film, plastic materials have better chemical and mechanical properties of nonmetal materials, and can be uses as good ornaments; what’s more, the process raises the electro conductibility, which enables nonmetal materials to shield electromagnetic waves.
The reason is that the solution concentration affects the metal deposition rate. 3) As the deposition time increases, the electromagnetic shielding property of Ni-Cu-P alloy film tends to increase.
Acknowledgements This work was financially supported by the Defensive Pre-research Foundation and Science Research Foundation of Shijiazhuang Mechanical Engineering College (JCB1006).
(Mechanical Industries Publications, China 1998) [2] K.
Online since: February 2018
Authors: Inese Ziemele, Inese Šroma, Annija Kakarāne
Physical comfort in a sportswear style and the factors influencing it were determined first by determining the typical movements of an athlete in the tested sportswear style.
Consequently, the physiological comfort will depend on the above factors [1].
Fig. 1 shows the interaction between physical and physiological factors that affect the physical and physiological comfort of a person.
To provide psychophysiological comfort throughout the training the fabrics chosen for sportswear, especially for professional sports clothing, should be fast-drying and with good thermal and moisture vapour transmission properties, namely, the fabrics and their layers should be “breathable”.
Than the determination of physical, mechanical properties of fabrics and their layers in accordance with standardized methods are performed.
Online since: December 2011
Authors: Ming Yan, Yu Cai Wu, Jing Chao Chen, Xiao Long Zhou
The metallographical microstructure analysis of CuSn alloy under hot processing state (Φ20mm) and cold drawing state indicates that CuSn alloy does not have the second-phase precipitation during preparation and processing, and the performance of contact wires only is related with sizes of alloy crystal grains, processing hardening capacity and other factors.
The intermediate phase exists and lattice distortion becomes large, but they will not affect on conductivity and the Solid solution strengthening effect is good .
The Microstructure Corresponding Alloy Material Performance See table 1 for mechanical property and electrical performance of Cu-Sn contact wire under hot processing state at different time periods.
Under the optimized hot processing process conditions, Cu-Sn contact wires do not have precipitated phase, and the tin element is completely solid soluble in the copper substrate and forms steady microstructure, which decides steady performance of contact wires; moreover, Properties can meet the demand of customers.
0.02318- 0.02322 Qualified See table 2 for mechanical property and electrical performance of Cu-Sn contact wire under cold processing state at different time periods.
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