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Online since: November 2016
Authors: Qing Liu, Bai Feng Luan, Chun Hong Li, Zhi Qiang Li, Wei Jun He
The mechanical properties of CNTs reinforced composites depend on a lot of factors [7-9], among which the most important two of them are the distribution of CNTs and the interface between CNTs and matrix.
Ruoff, Tensile loading of ropes of single wall carbon nanotubes and their mechanical properties, Physical review letters. 84 (2000) 5552-5555
Li, Improvement of interface and mechanical properties in carbon nanotube reinforced Cu–Cr matrix composites, Materials & Desig. 45 (2013) 407-411
Agarwal, An analysis of the factors affecting strengthening in carbon nanotube reinforced aluminum composites, Carbon. 49 (2011) 533-544
Benson, Mechanical properties of nanocrystalline materials, Progress in Materials Science. 51 (2006) 427-556
Online since: August 2013
Authors: Hai Yan Zhang, Xue Min Hu
The preparation principle, process and properties of cool wool fiber was studied during chlorination treatment with sodium hypochlorite.
Influencing factors in preparation of cool wool were investigated and the properties of cool wool were tested.
The scale structure of the wool affected the handle of wool, hydrophilic, the adsorption of dye and its reflection of light.
From Table 2 we can see that with the treatment time prolonged the properties of the fiber are changed.
El Gendy, et al. in: Dyeing, moisture regain and mechanical properties of wool fabric grafted with PMMA by chemical and radiation-initiated methods [J].
Online since: June 2014
Authors: Si Hai Chen, Wei Chen, Dong Luo, Guo Hua Jiao, Yuan Fu Lu
It’s necessary to design hysteresis compensation algorithm because the hysteresis effect of piezoelectric ceramics will affect the scanning accuracy of one-dimensional piezoelectric scanner.
In the paper, we firstly establish an inverse hysteresis model based on the generalized Prandtl-Ishlinskii model which describes properties of the piezoelectric ceramic, then use particle swarm algorithm to identify the parameters of inverse hysteresis model, obtaining a triangular wave signal with inverse hysteresis to drive one-dimensional piezoelectric scanner.
Due to the influence of external mechanical structure, the hysteresis loop is different between piezoelectric scanner and single piezoelectric ceramic.
When the one-dimensional piezoelectric scanner is driven by 20Hz triangular wave voltage, we can get the relationship between the input voltage v(t) and the deflection angle w(t) from the experiment, but it’s hard to obtain the weighting factors a1, a2 and bn (generally n is 10)by parameter identification because there is no unified and effective mothod to indentify the parameters.
In this paper we use particle swarm optimization (PSO) for parameter identification process [5], to find an optimal set of weighting factor a1, a2 and bn making model simulation and experimental data closest.
Online since: July 2011
Authors: Haruyuki Inui, Katsushi Tanaka, Toru Inoue, Wataro Hashimoto
EFFECT OF ELASTIC DRIVING FORCE ON THE EVOLUTION OF MICROSTRUCTURES IN THE SECONDARY CREEP STAGE Katsushi Tanaka1, a, Wataro Hashimoto1,b, Toru Inoue1,c and Haruyuki Inui1,d 1 Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto, Japan ak.tanaka@materials.mbox.media.kyoto-u.ac.jp, bwataro-hashimoto@student.mbox.media.kyoto-u.ac.jp, cimouetoro@gmail.com, dharuyuki-inui@mtl.kyoto-u.ac.jp Key words: raft structure, creep, elastic properties, XRD.
The microstructural evolution without chemical composition changes is determined by the change in the total mechanical energy.
On the assumption, only Uint is affected by the morphology of the microstructure.
In other words, the internal energy is not affected by external stresses and/or strains [10].
(2) Since the lattice constants of the γ and γ’ phases have a similar value, the factor aγ / aγ' is closed to unity and we ignore the factor in the following calculations.
Online since: December 2012
Authors: Bo Di Cui
The result indicated that the feed is the dominant factor on surface roughness followed by nose radius.
They found that feed is the most significant factor affecting surface finish and cutting speed has very little influence for both ceramic and CBN cutting tool.
They determined that surfaces produced by wiper tools contained blunt peaks with distinctly smaller slopes resulting in better bearing properties.
Machining parameters and their levels Machining parameters Level 1 Level 2 Level 3 Cutting speed (vc, m/min) 100 150 200 Feed (f, mm/rev) 0.1 0.2 0.3 Nose radius (r, mm) 0.4 0.8 1.2 ANOVA of Experimental Results The experimental results of surface roughness were analyzed with ANOVA, which was used for identifying the factors significantly affecting the performance measures.
At the same time, it can also be found that the cutting parameter mostly affecting surface roughness is the feed by comparing the three figures.
Online since: October 2018
Authors: Sianny Surya Putri Kurnia, Dede Taufik, Veni Takarini, Zulia Hasratiningsih
Dental porcelain is one of the indirect restoration material with excellent aesthetic properties,on the other hand porcelain hardness frequently causing excessive wear of antagonist teeth.
Statistic result shows that sintering temperature significantly affected the hardness value of the porcelain (p value < 0.05).
The biocompatibility, durability and strength of porcelain are also contributing factors for porcelain as indirect restoration, unfortunately porcelain still has some shortcomings, including its sufficiently high hardness values [1,2].
From this, we can conclude that sintering temperature affected the self-synthesized porcelain hardness.
Harabi, Sintering and mechanical properties of porcelains prepared from Algerian raw materials, Cerâmica, 57 (2011) 453-460
Online since: November 2012
Authors: Hitoshi Takagi, Yuji Hagiwara, Antonio Norio Nakagaito
It has been shown that the starch-abaca green composites can be biodegraded faster than neat starch resin [8], and that some kinds of the green composites have acceptable mechanical properties comparable to those of GFRP [8].
It should be noted that the natural fiber composites have not only better mechanical performance [4,6,7] but also interesting functionalities such as biodegradability [8] and thermal insulation property [5,9,10].
However, the detailed information on the micro-fracture behavior of the green composites is still lacking, because there are many complicated factors affecting the fracture behavior of the green composites; such as fiber fracture, debonding and matrix cracking.
It is therefore suggested that the amount of pre-damage affect the mechanical performance of the natural fiber-reinforced composites.
Online since: September 2013
Authors: Guo Xin Xue, Bo Hong, Xing Guo, Fang Chen
This might be due to shape, form and other factors of cellulose.
Parenchymal cell cellulose from sugar beet pulp: preparation and properties.
Preparation and properties of cellulose nanocrystals: Rods, spheres,and network.
Study on rheological properties of nanocrystalline cellulose colloid.
Study on rheological properties of nanocrystalline cellulose suspension.
Online since: July 2011
Authors: Marcos Valério Ribeiro, André Luís Habib Bahia
Among the materials that meet the mechanical strength and corrosion properties at temperatures around 815 °C one can find the nickel base alloy Pyromet® 31V (SAE HEV8).
The machinability index can be significantly affected by the properties of the materials being machined, properties and geometry of the cutting tool, cutting conditions employed and other miscellaneous factors such as stability of the machine tool, cutting environment, etc.
These properties are required for the efficient and effective performance in environments where they are employed.
The superiority of the coated carbide tools in relation to the uncoated tools can be attributed to the lubrication properties of the coating, resulting in low coefficient of friction at the interface workpiece-tool during machining.
The long chips affect the cooling preventing the refrigerant efficient penetration.
Online since: July 2014
Authors: T.V. Moorthy, R. Ravi Raja Malarvannan, M Shunmuga Priyan
An experimental investigation of mechanical properties of TiN and AlCrN Coated cutting tools have been performed at room Temperature.
The structure and functional properties of PVD and CVD coated AI2O3+ZrO2 oxide tool ceramics.
Wear 257(2004) 304-310 [7] Miha Cekada,Peter Panjan,Darja Kek Merl,Marijan Macek.Mechanical Properties of CrN/Cr coatings with different thicknesses.Materiali in Tehnologije 37(2003)5,ISSN 1580-2949 [8] J.L.Mo, M.H.Zhu.
[23] M.Okumiya, M.Griepentrog, Mechanical properties and Tribological behavior of TiN-CrAIN and CrN-CrAIN multilayer coatings, Surf.Coat.Technol.112 (1999)123-128
[24] E.Lugscheider,K.Bobzin,K.Lackner,Investigations of mechanical and tribological properties of CrAIN+C thin coatings deposited on cutting tools , Surf.Coat.Technol174-175(2003)681-686
Showing 11541 to 11550 of 26166 items