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Online since: May 2011
Authors: Cheng Long Zhang, Ping Fa Feng, Zhi Jun Wu, Ding Wen Yu
It is also concluded that the effective cutting depth of diamond particles is the main factor for surface roughness in RUD of K9 glass.
However, it is one of the most difficult-to-machine materials due to its mechanical characteristics.
Illustration of the movement properties of rotary ultrasonic drilling: (a) The hybrid motion of the diamond particle; (b) z-axial direction movement principle.
As displayed in Fig. 2 (b), the effective machining depth of diamond particle in RUD is higher than the performance of diamond drilling at the same machining conditions that is inferred that the movement features of diamond particles in RUD process affect the machined surface quality.
It can be concluded that the effective cutting depth of diamond particles is the main factor for surface roughness in RUD of K9 glass.
Online since: August 2013
Authors: Li Bao An, Shao Hua Zhen, Chun Rui Chang
Simulation on the Dielectrophoretic Assembly of Carbon Nanotubes Shaohua Zhen1,a, Libao An1,b,*, Chunrui Chang2,c 1College of Mechanical Engineering, Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, Hebei United University, Tangshan, Hebei 063009, China 2College of Science, Hebei United University, Tangshan, Hebei 063009, China azhen_shaohua@163.com, blan@heuu.edu.cn, cchangchunrui@heuu.edu.cn *Corresponding author keywords: Carbon nanotubes, Dielectrophoresis, Assembly, Simulation.
Introduction Since their discovery in 1991, carbon nanotubes (CNTs) have attracted great research interests due to their unique one-dimensional structure and outstanding properties [1].
The DEP force due to the nonuniform electric field can be expressed by [15] , (1) , (2) where r is the radius of the particle; l is the longest dimension of the particle; εp is the permittivity of the particle; εm is the permittivity of the medium; KA is the Clausius-Mossotti factor which is related to the complex permittivity of both the particle and the medium.
The alignment of CNTs will be affected due to the existence of floating electrodes.
In the quadruple electrode structure, because the floating electrodes alter the electric field distribution, the alignment of CNTs will be affected.
Online since: September 2013
Authors: Hui Xu, Guo Bin Li, Qian Qian Shang
The former two are wall resistance, and the resistance caused by vegetation is used for affecting the water body along the depth direction.
Resistance coefficient of submerged plants decreases in nonlinearity mode as submerging degree increases, the bigger plant density, the faster decrease speed is, but degenerative speed gradually decelerates and roughness factor coefficient trends to be a constant; the contribution that side-wall has on roughness factor gradually increases when submerging degree is big enough and roughness factor coefficient will tend to be stable.
The appearance position of maximum value of turbulence intensity is affected both by plant density and plant relative height .
The research mainly adopts project effect as guidance, but systematically mechanical theory research and mathematical model simulation technique research are rare.
[19] Turbulence Intensity Maximum and its Influence Factors in Submerged River Flow with Plant.
Online since: May 2014
Authors: Elio Chiappini, Stefano Tirelli, Michele Monno, Matteo Strano, Quirico Semeraro
The considered input factors are: type of cooling method, cutting speed and feed rate.
Introduction and state of the art Titanium alloys present many interesting mechanical properties (such as very high strength to weight ratio, high toughness, biocompatibility and good corrosion resistance) that promote the use of these materials not only in the aerospace industry, but also for bio-medical applications and for the chemical and oil & gas industries.
The ANOVA test has been used as the statistical method to determine if each investigated factor significantly affects the measured responses.
All factors and interaction are significant, with the exception of the interaction ln(f)*ln(t cum).
Segmentation frequency values range from about 3500 Hz to 7000 Hz, with cutting speed and feed rate being the significant factors.
Online since: December 2012
Authors: Salwa Tashkandi, Sinnappoo Kanesalingam, Amit Jadhav, Li Jing Wang
Thermal comfort properties of textile fabrics are influenced by a range of fibre, yarn and fabric properties [2-5].
Results and Discussion Physical Properties of Knitted Fabrics.
Experimental results showed that knit structure, fibre composition and other fabric properties affect the thermal comfort performance.
Havenith, Thermal insulation and clothing area factors of typical arabian gulf clothing ensembles for males and females: Measurements using thermal manikins, Applied ergonomics, 39(3), (2008), p. 407
Ng, Study of three-dimensional spacer fabrics:: Physical and mechanical properties, Journal of materials processing technology, 206(1), (2008), p. 359
Online since: August 2020
Authors: Majid S. Mohammed, Mohammed L. Ahmed, Ziadoon M. Ali, Akram S. Mahmoud
Introduction Recently, many researchers have been conducted many researches deal with the sustainable materials or how to reduce the wastes in the world, such as using the polyethylene terephthalate PET wastes in concrete to enhance the mechanical properties of the concrete as well as produce an eco-friendly concrete [1,2].
Its chemical and physical properties and its compositions are given in Tables 1.
Table 1: Chemical and physical properties of tested cement Oxide Composition Abbreviation By weight% Limitations of specification Lime CaO 60.6 - Silica SiO2 22.4 - Alumina Al2O3 3.02 - Iron oxide Fe2O3 5.24 - Sulphate SO3 2.34 ≤ 5% Magnesia MgO 2.3 ≤ 2.8% for C3A ≥5% Loss on Ignition L.O.I. 2.27 ≤ 4% Lime saturation Factor L.S.F. 0.98 0.66-1.02 Insoluble residue I.R. 0.78 ≤ 1.5% Main compounds (Bogues eq.)
Loza Yañez, “Effects on mechanical properties of recycled PET in cement-based composites,” International Journal of Polymer Science, vol. 2013, no. 1, pp. 1–7, 2013
Roman, “Mechanical properties of recycled PET fibers in concrete,” Materials Research, vol. 15, no. 4, pp. 679–686, 2012
Online since: January 2022
Authors: Vivian Loftness, Kent A. Harries, Erica Cochran Hameen, Lola Ben-Alon
· What factors affect the motivation of end users to use earthen building materials and methods in the construction or renovations of their homes?
Specified machinery included mechanical mixer, block compressing machine, tractor, rammer, and excavator for sight leveling.
This result corresponds with the answers of the homeowners respondents, who rated indoor air quality, following by environmental factors (global climate change and resource depletion) as the most significant motivating factors in their choice of earthen materials.
In contrast, the least significant factors motivating homeowners (according to both experts and homeowners) are affordability and reduced utility bills.
Codes and standards development for nonconventional and vernacular materials, Nonconventional and Vernacular Construction Materials: Characterisation, Properties and Applications. https://doi.org/10.1016/B978-0-08-102704-2.00004-4 [4] Heathcote, K., 2011.
Online since: July 2015
Authors: Toshihiko Kuwabara, Masazumi Saito, Chiharu Sekiguchi
The general trend of the DH appeared to be affected by the average r-value, or equivalently by the texture, of the materials.
Introduction Anisotropic yield functions are one of the most dominant factors that enhance the predictive accuracy of material deformation behavior and defects in sheet metal forming simulations [1, 2].
Mechanical properties of the test materials Material Tensile direction [°] [MPa] c* [MPa] n* a* r-value** Material A ‎[8] 0 (RD) 164 574 0.273 0.008 2.27 45 173 574 0.272 0.008 1.77 2.1 90 (TD) 170 564 0.273 0.009 2.65 Material B 0 (RD) 155 624 0.332 0.014 1.92 45 164 636 0.334 0.015 1.63 1.8 90 (TD) 161 616 0.349 0.018 2.13 Material C ‎[13] 0 (RD) 158 541 0.249 0.004 1.34 45 162 550 0.262 0.005 1.13 1.3 90 (TD) 159 535 0.260 0.005 1.50 *Approximated using for 0.0020.093, ** Measured at nominal strain0.1.
Tvergaard, V., Effect of strain path change on limits to ductility of anisotropic metal sheets, International Journal of Mechanical Sciences 42 (2000) 867–887
Kuczyński, Limit strains in the processes of stretch-forming sheet metal, International Journal of Mechanical Sciences 9 (1967) 609–620
Online since: March 2014
Authors: Benudhar Sahoo, Sashi Kanta Panigrahi
However, for low pressure turbine rotor blades, fatigue becomes the dominating factor dictating its life.
Determination of mechanical properties with varied temperature Tensile tests have been carried out using fuuly digital closed loop control INSTRON, UK Tensile testing machine Model: 4507 at RT, 400 °C and at 700° C respectively to determine UTS and YS which is given in Table 1.
Yield strength, doesn’t get affected much with the test temperature.
Table 1: Mechanical Properties of AP220BD at different temperatures.
Because of this, yield strength doesn’t get affected much by temperature even upto 700° C.
Online since: February 2014
Authors: Yong Zhou Wang, Hong Hai Huang, Li Ding, Wei Yong Deng, Bei Long Zhang, Ping Yue Wang
The molding and the mechanical properties of rubber product will be affected if Mooney viscosity is low.
Money viscosity of natural rubber is related to many factors such as strains of natural rubber tree and production technology of natural rubber1.
However, the physical and chemical properties of natural rubber and the aging resistance of natural rubber will change with addition of hydrazine dihydrochloride or hydrazine sulfate.
During storage of natural rubber at room temperature, owing to the effect of the environmental factor(mainly light, heat and oxygen), the natural rubber molecules degrade, causing the natural rubber to depolymerize and turn to a nonelastic state, then lose its performance characteristics at last3.Zhang et al.4 studied the effective storage time of natural rubber at difference storage condition, however, no paper is available about the study on the effective storage time of natural rubber containing hydrazine dihydrochloride or hydrazine sulfate.
Table 1 The largest peak temperature Tp of oxidative exothermal peak activation energies of oxidation reaction of rubbers tackifier heating rate (℃/min) activation energy (kJ/mol) correlation coefficient 4 5 6 8 10 the largest peak temperature of oxidation exothermal peak Tp (℃) the control 189.11 193.43 200.22 203.50 104.7 0.9877 hydrazine dihydrochloride 190.04 194.41 195.80 200.77 205.65 105.6 0.9935 hydrazine sulfate 189.52 193.91 194.91 201.79 204.60 103.1 0.9906 Effect of tackifier on effective storage time of natural rubber Heat aging life equation of high molecular weight materials The heat aging life equation6,7 of high molecular weight materials is usually as follows τ= + (3) Where a is a constant, the intercept of aging life line; b is E/2.303R, E is the activation energy of oxidation, and R is gas constant (R= 8.314); T is ambient temperature K; τis the time need when the properties of high molecular
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