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Online since: March 2008
Authors: Kanji Tsuru, Satoshi Hayakawa, Akiyoshi Osaka
Implant materials with being bioactive and better mechanical properties are now demanded since too harder materials than bone, like metals and ceramics, are disadvantageous in causing malfunctions like loss of bone itself due to stress-shielding effects.
They suggested that Ormosils consisted of nano-sized silica clusters interconnected by the PDMS chains (Fig.4), and they controlled chemical and mechanical properties of the hybrids by changing the mixing ratios of TEOS and PDMS [30-33].
However, it is inferior in mechanical properties and too highly biodegradable for most medical applications.
Hence the polysaccharide chains should be cross-linked and networked to some extent, so that its mechanical properties are improved and has controlled biodegradability.
The mechanical properties of the hybrids depended on the content of GPTMS, increase of GPTMS give stiffening to the hybrids membrane.
Online since: February 2013
Authors: Wen Juan Gu, Ying Li, Xiao Hui Zhang
The energy needed to recycle the solvent and the properties of the final product are all need to be considered.
Printing ink affects the environment greatly, which is the most serious pollution in printing industry.
What’s more, they would form oxide and photochemical smog pollute atmosphere under the irradiation of sunlight, which seriously affects people’s health and the quality of the environment.
The pH value, temperature, humidity, enzyme, osmotic pressure and other factors influence the symbiotic net structure and effective microbial activity.
The economical benefit would be affected even causing improved production cost when the ink pollution of other source of pollution occurred to this kind of equipments.
Online since: December 2012
Authors: Rui Tao Peng, Xin Zi Tang, Xiong Wei Liu
Aerodynamic Design and Finite Element Modelling of Mixed Aerofoil Wind Turbine Blades Xin Zi Tang1, a, Rui Tao Peng1, b and Xiong Wei Liu1, c 1School of Mechanical Engineering, Xiangtan University, China atangxinzi@xtu.edu.cn, bpengruitao@xtu.edu.cn, cxliu9@uclan.ac.uk Keywords: wind turbine blade, aerofoil, aerodynamic, finite element method, composite material.
The properties and distribution of these aerofoil shapes are listed in Table 1.
Some small alternations have been made to the tip region which do not affect the power coefficients so much but would reduce thrusts at high winds.
Table 2 Layup schedule for the blade Component Radius (%) Z location(mm) Layup schedule Thickness(mm) Root 2.8 to 5 140 to 250 [±45/06/±45/06/+45]s 9.35 Spar cap 5 to 20 250 to 1000 [±45/06/±45/06/+45]s 9.35 20 to 40 1000 to 2000 [±45/05/±45/05/+45]s 7.5 40 to 60 2000 to 3000 [±45/04/±45/04/+45]s 5.2 60 to 80 3000 to 4000 [±45/03/±45/03/+45]s 3.85 80 to 100 4000 to 5000 [±45/02/±45/02/+45]s 2.7 Leading edge 5 to 20 250 to 1000 [±45/02/±45]s 3 20 to 100 1000 to 5000 [±45/0/±45]s 1.85 Trailing edge 5 to 80 250 to 4000 [±45/0/balsa/0/±45]s 7 80 to 100 4000 to 5000 [±45/0]s 1.3 Shear web 5 to 100 250 to 5000 [±45/02/±45]s 3 The loadings affecting a wind turbine blade are important in two primary areas including ultimate strength and fatigue.
Considering the weight factor, thickness of layups rapidly declined in the direction from root to tip, which results in local strain discontinuous areas.
Online since: July 2011
Authors: Kevin G. Ewsuk, Nathan Young, Jay Johnson
To facilitate and optimize package design, thermal and mechanical simulations were used to understand and control the critical parameters in LTCC package design.
The material properties utilized for the baseline model are summarized in Table 1.
Table 1: Materials and Properties used in Thermal Modeling.
The best possible material property values are assumed in the analysis.
Retrieved 15 June, 2010, from Matweb Material Property Data: http://www.matweb.com/search/Indium
Online since: May 2013
Authors: Jian Sheng Lu, Peng Song
The thermally growth oxide (TGO) is one of the most important factors to affect TBC lifetime.
Both β-NiPtAl and γ+γ′ coatings were brittle at room temperature and comparable ductile at high temperature, however, γ+γ′ coatings had a better mechanical properties due to less inter-diffusion during processing [7, 10, 11].
Online since: May 2011
Authors: Hong Bing Xiao, Guo Sheng Lu
In order to reveal the engineering characteristics of the deep completely decomposed granite soil in Hainan east loop line, a passenger dedicated line, four groups of centrifuge model tests were conducted to study the settlement properties of the subsoils untreated, treated by dynamic compaction, and reinforced with cement-mixed piles, under the action of the embankment, especially the relationship between settlement and time, including the settlement during and post-construction.
The physical and mechanical parameters of the soil are shown in Table 1.
After drying, crushing, and screening through 2 mm sieve, the foundation soil was filled into the model box layer by layer with moisture content and bulk density as control factors.
Taking into account these factors in the centrifugal model tests still need further study in our future work.
Taking into account these factors in the centrifugal model tests still need further study in our future work.
Online since: July 2013
Authors: Xian Feng Huang, Yi Min Lu, Dong Dong Wang
Therefore, the proposed method is not affected by the complexity of the system and is not sensitive to noises.
The traditional method uses Takens Theorem [3] to reconstruct phase space, from which chaotic properties of the system can be acquired for computing the Largest Lyapunov exponent from small data sets [4].
In this paper, we use an adaptive controller to suppress periodic oscillations and chaotic oscillations, and alter the control strength by adjusting the control strength factor.
This improved Dc(n) exhibited better convergence properties.
Tr=Lr/Rr, ωe=ωr*-ωr means the rotor flux time constant and the difference between the reference and the real mechanical rotor speed.
Online since: October 2010
Authors: Yuong Chen, Yan Fei Chen, Jing Tian, Li Juan Xu, Shu Long Xiao
Introduction γ-titanium aluminides (TiAl alloys) are considered as top candidate materials for high-temperature applications due to their attractive properties such as low density, high specific strength, high specific stiffness, hig temperature strength retention and resistance against ‘titanium fire’[1-4].
To evaluate the mechanical properties of the moulds at room temperature, three-point bend tests were conducted on the green and fired bars at room temperature.
The presence of reaction layer is responsible for the inferior mechanical properties.
It was demonstrated that the casting parameters are important factors that can significantly affect the formation of reaction layer.
Online since: April 2010
Authors: Ali Shokuhfar, H. Bolvardi, N. Daemi
Daemi1,c 1 Faculty of Mechanical Engineering, K.N.
Introduction Surface modification by coatings has become an essential step to improve the surface properties such as wear, corrosion and oxidation.
This would allow an optimization of the processing parameters and coating composition in order to achieve properties desired for various applications.
Artificial neural networks In the present work the ANN model was established for predicting micro-hardness properties of coatings that was based on feed-forward multilayer perceptron.
This process consists of adjusting the values of the connections (weight factors) between neurons.
Online since: February 2011
Authors: Ci Chang Qiu, Dong He, Jiang Feng Dong, Qingyuan Wang
There are many factors due to these deteriorations, such as ageing, corrosion of steel, a change of use or the environmental effects such as earthquakes, especially the disastrous Sichuan earthquake on 12 May 2008 [2], in which so many structures were damaged or deteriorated need to be reinforced.
Properties of materials.
The mechanical properties of concrete, steel reinforcing and high strength of CFRP sheets were given in Table 2.
Table 2 Mechanical properties of beam materials Material Dimensions (mm) Yield strength (Mpa) Compressive strength (Mpa) Tensile strength (%) Elastic modulus (Gpa) Concrete C20 - 22.8 - - Steel reinforcing D = 6 240 420 420 210 D = 8 330 490 490 210 D = 10 340 480 480 210 D = 14 410 555 555 200 CFRP sheets tf = 0.111 - - 3467 250 Experimental setup and measurements.
Although the ultimate CFRP strain decrease with increasing beam size or tensile reinforcement ratio, the precracked degree did not seem to be affected.
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