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Online since: January 2012
Authors: Boris Minov, Luc Dupré, Milan J. Konstantinović
Introduction The highest attention in nuclear power plants is devoted to the age related degradation of the mechanical properties of the reactor pressure vessel (RPV) steel and in particular to the neutron irradiation induced embrittlement of the steel [1].
However, in spite of accumulated experimental data related to the microstructural properties of irradiation induced precipitates and other defects, the full correlation with macroscopic mechanical behavior is not yet established.
Konstantinović, Tensile properties and internal friction study of dislocation movement in Fe-Cu system as a function of Cu-precipitation, J.
Kobayashi, Internal friction and magnetic properties of thermally aged Fe-1 wt.% Cu alloys, Mat.
Ritchie, Internal friction and microdeformation due to the intrinsic-properties of dislocations-the Bordoni relaxation, Prog.
Online since: April 2012
Authors: Chia Lung Chang, Li Chung Chen, Po Hsien Li
Therefore the package tends to warp under thermal or mechanical loadings.
Material selection and structural layout significantly affect package-level reliability.
Kong and Kim [1] have studies the effects of processing temperature and material properties of components on package warpage.
Oota and Shigeno [2] used finite element method to study the impact of material properties of molding compound on package warpage.
The simulation deviation may be caused by that the material properties of the package model is assumed to be temperature independent.
Online since: October 2011
Authors: Ren Guo Gu, Wei Dong Pan, Xiao Long Sheng, Ke Zhu
Through theoretical research and field measurements, the concrete influences of water level weight, dissipation rate and other factors on the consolidation process are obtained.
The selection of calculation parameters Table 1 Calculated parameters of research object Calculated parameters Parameter values Calculated parameters Parameter values Initial void ratio 1.968 Natural water content 72.3% Thickness of soil 17m Volume compressibility 0.708MPa-1 Radial consolidation coefficient 1.08×10-3cm2/s Vertical consolidation coefficient 0.86×10-3cm2/s Radial permeability coefficient 0.764×10-7cm/s Vertical permeability coefficient 1.0×10-2cm/s Smear permeability coefficient 0.382×10-7cm/s Affect diameter 1.13m Sand drain diameter 66mm Diameter of smear zone 132mm Thickness of sand cushion 2.0m Natural unit weight of sand cushion 19.0KN/m3 Natural unit weight of heaped load sand 19.0KN/m3 Bulk density of water 10.0KN/m3 Selection of calculation parameters and data of load and water level Zone ② of this engineering is taken as the research object.
Some Engineering Properties of the Dredger Fill[J].
New technologies of foundation reinforcement[M].Beijing: Mechanical Industry Press, 1999
Online since: September 2021
Authors: Ojo Sunday Issac Fayomi, Khadijah Tolulope Dauda, Kunle Michael Oluwasegun, Mojisola Olubunmi Nkiko
The influence of ZrB2 particulate on the morphology and corrosion properties was examined.
Conclusion This study has examined an in-situ properties and performance of Ni-P-Zn-5ZrB2 fabricated under different electrodeposited time condition.
Thus, providing a compact, appealing and self-healing properties.
F.Ashby, Engineering Materials 1: An introduction to properties, applications and design.
Wang, Microstructure and properties of Cu-Sn-Zn-TiO2 nano-composite coatings on mild steel.
Online since: February 2004
Authors: Ji Wang Yan, Katsuo Syoji, Tsunemoto Kuriyagawa, Junichi Tamaki
Kuriyagawa 2 1 Department of Mechanical Engineering, Kitami Institute of Technology Koen-Cho 165, Kitami, Hokkaido 090-8507, Japan 2 Department of Mechatronics and Precision Engineering, Tohoku University Aramaki-Aoba-01, Aoba-Ku, Sendai 980-8579, Japan Keywords: Ductile Regime Machining, Brittle Material, Aspherical Lens, Optics, Calcium Fluoride, CaF2, Diamond Turning, Ultra-Precision Cutting Abstract.
CaF2 has unique optical properties including extremely low color aberration.
In the conventional arc-enveloping method, tool geometry error and tool setting error are the two factors affecting the form error of product.
The only factor that causes form error in this method is tool setting error.
The X and Z tables are supported by high-stiffness hydrostatic bearings and are driven by AC servomotors via hydrostatic screws, allowing smooth nanometric movement with negligible mechanical friction.
Online since: January 2016
Authors: Olabomi Rasaq Adekunle, Amir A. Saad, Abu Bakar Jaafar, Md Nor Musa
Soil Cooling Load Analysis To cool the soil, consideration is given to its basic constituents (soil particles, water and air) while soil properties like soil thermal conductivity, thermal diffusivity and volumetric heat capacity are also considered for the heat transfer analysis.
System Component Modelling ORC-ARC is modeled with respect to mass and energy balance across the major components and the thermodynamic properties of the working fluid.
The thermodynamic properties of the working fluid is obtained/calculated from the ‘National Institute for Standard Technology’ (NIST) database The time rate of change of internal energy within the system equals net energy transferred by heat, work and mass within the system.
Tardieu, Temperature responses of developmental processes have not been affected by breeding in different ecological areas for 17 crop species.
[5] Johnson, G., Weekly Crop Update How High Heat Affects Vegetables and Other Crop Plants, in Weekly Crop Update timely vegetable & agronomic crop info from University of Delaware Cooperative Extension, U.o.
Online since: May 2016
Authors: Thierry Chassagne, Daniel Alquier, Jean François Michaud, Marc Portail, Marcin Zielinski, Rami Khazaka
SiC is also professed as an ideal candidate for microsystem applications due to its excellent mechanical properties and chemical inertia, making it suitable for harsh environments [1-3].
The resonant devices presented in Fig. 1 aim to benefit for the mechanical properties of silicon carbide.
Actually, cantilevers can be directly targeted structures [10,15], but are also perfect objects to explore mechanical properties through their static and dynamic performances.
Nonetheless, the mechanical properties of sub-micron SiC films were missing in the literature, which was a motivation for us to deal with.
This result was an evidence that the mechanical properties of 3C-SiC films were severely affected by the defect density, as it was suggested since 1992 but never highlighted up.
Online since: April 2008
Authors: Shao Qiang Yuan, Xiao Dong Sun, Yu Mang, Guang Tao Zhou, Guo Li Liang
The joining technology is an effective solution way for simplifying product design and decreasing the cost, which affects the wide application of magnesium and magnesium alloys [1].
It is well known that the welding temperature field determines the stress and strain field during the welding process, and it also has the relationship with metallurgy and phase transformation, the welding temperature field is the main factor to influence the welding quality and welding efficiency [3].
It was well known that the welding zone is co-acted by the laser and TIG arc, which has the different physical properties and energy transfer mechanism.
From Fig.3 (a) (b), it can be observed that the isothermal line scope of the hybrid welding obviously narrower than that of TIG single welding, which showed that the heat affected zone (HAZ) of hybrid welding is much narrower than that of single TIG welding, because the conductivity of the magnesium alloy is very high, which needs the high energy and high speed welding to achieve the satisfied penetration.
From the Fig.6 (a) (b) it can be observed when adapt the single TIG heat source to weld the magnesium alloy AZ31B, the grain is obviously coarse and the heat affected zone is very wide due to the low energy density and heat input, which drastically reduces the joints performance.
Online since: January 2013
Authors: Xuan Tang, Xi Tao Cheng, Feng Lin Huang
Comparison of predicted and experimental values revealed good correspondence, implying that empirical model could be used to adequately describe the relationship between the factors and response in OPC synthesis process.
Experimental design A four factors and three levels (−1, 0, +1,) central composite design( CCD )was employed in this study, requiring twenty-four factorial points and three replicates of the central point.
Among the four parameters studied, amount of BTC was the most significant factor to affect the yield of OPC, followed by the amount of catalyst , reaction temperature and time.
“Four-factor response surface optimization of the enzymatic modification of triolein to structured lipids” J Am Oil Chem Soc.72 6-10, 1995 [4] Soo EL, Salleh AB, Basri M, Rahman RNZA, Kamaruddin K.
“Effect of the sulfidation process on the mechanical properties ofaCoMoP/Al2O3 hydrotreating catalyst” Chemical Engineering Science. 2 198-206, 2009 [9] Juan Mao, Shi Yn Lee , Sung Wook Won, Yeoung-Sang Yun.
Online since: September 2016
Authors: Kai Kun Wang, Jin Long Fu, Xiao Wei Li, Fei Yin
The paper contributes to a better understanding of the thixo-co-extrusion technology for the production of double-layer tubes with desirable mechanical properties.
Due to these outstanding properties, the tubes can be utilized in household appliances, automobiles, aerospace industries, and high-speed trains.
Higher temperatures on the interface leads to much faster atomic diffusion, which is an essential factor of metallurgical bonding.
Guo, Bonding properties of interface in Fe/Al clad tube prepared by explosive welding, Trans.
Koke, Time-Dependent Rheological Properties of Semi-Solid Metal Alloys, Mech.
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