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Online since: May 2012
Authors: Chao Qun Wu, N. Nakagawa, Shao Feng Zhou
The BLT converts electric energy into mechanical vibration which is scaled by a stepped horn.
The effect of temperature on the intensity of cavitation depends on the following two factors: one is gas solubility, the other is vapor pressure of the liquid.
The vapor pressure of water is unique factor which affects the intensity of cavitation.
When ultrasonic cavitation is employed to remove burrs from a part, cavitation bubbles collapse in the vicinity of the specimen which may cause the change of mechanical property (i.e., microhardness).
Manas etc., Influence of different factors on the output power transferred into medium by ultrasonic.
Online since: July 2009
Authors: Bernardino Chiaia, Mauro Borri-Brunetto, Marco Deambrosi
According to the impetuous onset of biomechanics and to the surge of nanomechanics, it is now possible at least to imagine a bottom-up design of structural materials with multiscale arrangements of the elementary constituents and smart (active) control of the mechanical properties.
The elastic properties of skin have been experimentally investigated by a number of researchers [4-8], mostly aimed at understanding the mechanisms of healing, improving surgery operations, and developing tissue engineered replacements.
The averaged properties of the fibril bundle are used as parameters in the continuum formulation, which is based on the description of the meso-level fibers.
This special nonsingular stress field is the archetype of fracture mechanics problems (i.e., where the singular field is expressed in terms of stress intensity factors).
Fung: Biomechanics: mechanical properties of living tissues (Springer Verlag, New York 1981)
Online since: July 2020
Authors: Yunasfi Yunasfi, Wisnu Ari Adi, Engkir Sukirman, A. Insani
The refined values of the atomic occupation factors (gj) of the NiCexFe2-xO4 are listed in Table 3.
The refinement results of atomic occupation factors (gj) and fractional coordinate of the NiCexFe2-xO4 unit cell.
Sheilding Properties of CuNiZn Ferrite in the Radio Frequency Range.
Magnetic Properties and Microwave Absorption in Ni-Zn and Mn-Zn Ferrite Nonoparticles Synthesized by Low-Temperature Solid-State Reaction.
Agrawal, Effect of Ce Doping on the Magnetic Properties of NiFe2O4 Nanoparticles, J.
Online since: January 2016
Authors: Qiu Lian Dai, Can Bin Luo, Jing Feng Liu
Experimental Study of Fabrication of cast-Iron bonded cBN grinding wheels by V-EPC (I)----The Influence factors on the Qualities of Grinding Layer Qiulian Dai 1, a *, Canbin Luo 2,b and Jingfeng Liu 3,c 1,2,3 MOE Engineering Research Center for Brittle Materials Machining, Huaqiao University Xiamen, Fujian, 361021, P.R China a lisadai@hqu.edu.cn, blcbrobin@hqu.edu.cn , cljf_027@163.com Keywords: cast-Iron bonded, cBN grinding wheels, V-EPC, Casting Parameters, Microstructures, Thermal Damage.
Therefore, the bond of the cBN grinding wheels must have a high strength, wear resistance and good grain retention properties.
Austenite-bainite ductile iron is an important commercial engineering material because of excellent properties such as high strength with good ductility as well as good fatigue strength and fracture toughness together with excellent wear resistance[2].
These properties are as a result of a microstructure composed primarily of acicular ferrite (banite) and high carbon austenite.
By exploring V-EPC process to fabricate the metal-bonded cBN grinding wheels, higher retention ability of the metal matrix for cBN grits is expected due to the increase of the mechanical locking and the chemical bonding between the metal bond and cBN grits.
Online since: January 2016
Authors: Azwan Iskandar Azmi, Chye Lih Tan, Gou Zhou Keh, W.M.M. Irina, M.N.M. Radzi, K.W. Leong
Introduction Composite materials consist of two or more phases that are processed separately and then bonded together to achieve superior mechanical properties.
The selection was based on the three factors and at three levels specified in Table 1.
In term of ranking, the drill bit is in the first position among the other two factors.
Hence, this directly implies that the drill bit is the most significant parameter that affects delamination.
With regard to the spindle speed and feed rate, both of these factors should be kept at lowest level in order to minimise the delamination factor.
Online since: August 2011
Authors: Ming Der Jean, Ming Tsong Chou
Several binary and ternary nitride systems, such as TiN, CrN, and TiAlN, have found industrial applications, owing to their good mechanical and thermal properties.
Many studies of CrN films in BMS processes have concentrated on their mechanical properties [9-16], but the grain structure, the crystallographic orientation and other properties of these coatings depend very much on the deposition technique and parameters.
The aim of this work is to determine the distribution of the varying magnetic field and its effect on mechanical properties.
Table 2 A comparison of CrN films for mechanical properties of different GDMTs.
The mechanical properties of CrN films are reported.
Online since: May 2011
Authors: Ling Ling Wang, Yu Zhen Chang
HAN Qing-hua [2] indicated that restrained boundary condition is an important affecting factor to ultimate bearing capacity and buckling mode of single-layer reticulated shell.
The steel-concrete composite ribbed shell which is studied in this paper is a new large spatial structure, although our research group has investigated the mechanical properties and buckling forms under uniform pressure loads [6], however, all the results were limited under the fixed boundary conditions, the research data of mechanical property and instable mode under the other boundary constraints is not available yet.
The custom section of ANSYS[7] is used, the material properties of steel and concrete are considered, the spatial beam element beam188 is adopted to simulate the composite rib by considering large deformation, large rotation and large strain effects, equal thickness curved shell element shell181 is chosen to simulated the reinforced concrete shell.
To simulate the concrete property, Kent-Park constitutive model with fell segment is selected, while flexible-hardening model with the second line for the steel, in which the stress-strain curve is divided into elastic, strengthening segment.
The whole mechanical process is traced, the variations of the load-displacement and the instable regions are studied in detail, and finally the ultimate bearing capacity is determined.
Online since: May 2011
Authors: Tao Li, Bo Liu, Yan Li, Chang Jun Song
Concerned with both own properties of foam and mechanical properties of foamed soil, and combined with the principle of EPB shield construction, Zhu (2004) and Qin (2004) evaluated measures and corresponding index of the foam in shield tunneling construction, and these results could provide practical information for the application and selection of foam technology in EPB shield [6,9].
Luo (1995) obtained the physical and mechanical properties of the chemical improved swelling soil [8].
The properties of the three foams can be obtained in this paper.
The effect factors to foam concentration are mainly manifested in two aspects.
Red soil microstructure and its foam-modified properties for metro shield tunneling engineering in Southern China.
Online since: November 2005
Authors: Hee Jun Jung, Song Chun Choi, Sang In Han, Ji Yoon Kim
RBI is an integrated methodology that factors risk into inspection and maintenance decision making.
Likelihood category is composed of equipment, damage, inspection, condition, process, and design factors, which are indicated in grade 1, 2, 3, 4, or 5.
The consequence category is composed of chemical, quantity, auto-ignition, credit, state, and pressure factors while the health consequence category toxic quantity, dispersibility, credit and population factors, each of which is indicated in grade A, B, C, D, or E.
An adjusted failure frequency is calculated by multiplying the generic failure frequency by the two modification factors [1].
With remarkably high corrosion rate of 24.4 mpy measured as general corrosion, there was great risk factors due to thinning.
Online since: February 2013
Authors: Yao Ji Li, Xiao Shuang Li, Meng Lai Wang
Due to a variety of factors, the rock-fall event generally has the law which is multiple, abruptness, randomness and so on.
The mechanism of slope rock-fall disaster [6-9] The sufficient condition of rock-fall events is loose rock (the sources of rock-fall) on slope, external factors (the factors to occur rock-fall) and the rock where the terrain slope is greater than original angle of repose, then the rocks will move downward along slope because loss of balance.
Overall, the factors of rock-fall divided into internal and external factors.
The internal factors are mainly structure, physical and mechanical properties, degree of weathering, environment of ground stress, groundwater environment and so on.
And the external factors are mainly natural variation (precipitation, temperature, freezing and thawing, plant root hack, seismic activity, etc.), human activities of excavation, as well as other causes of the disturbance.
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