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Online since: February 2008
Authors: Shun Li, Jia Chen Liu, Zhong Qiu Li, Bing Zhou, Wei Jing
Introduction The degree of damage and strength degradation of ceramics subjected to severe fluctuating thermal environments are major limiting factors in relation to service requirements and lifetime performance.
Processing and microstructure design are recognized as key factors in improving the thermal shock resistance of ceramics [1].
ZrO2 is an important material that is widely used in structural engineering due to its excellent mechanical properties and good erosion resistance [3].
Wu et al. [7] have studied thermal and mechanical properties of sintered LaPO4-ZrO2 composites.
Experimental Mechanical property.
Online since: June 2015
Authors: K. Palanikumar, M. Kathirvel
Palanikumar2, b 1Department of Mechanical Engineering, PSN Institute of Technology and science, Tirunelvel- 627 152, India. 2Department of Mechanical Engineering, Sri Sai Ram Institute of Technology, Chennai- 600 044, India.
amkathirvelphd@gmail.com , b palanikumar_k@yahoo.com Keywords: Metal Matrix Composites, Surface roughness, volume fraction Abstract: Metal matrix composite materials are finding increased applications in many fields due to their excellent properties.
Introduction Metal matrix composite (MMC) materials are finding increased applications in many fields due to their excellent properties compared to the conventional materials.
Table.2 Properties of the Composite Material Material Form Formula Melting Point (°C) Density g/cm³ Graphite Powder C 2054 3.97 Silicon Carbide Powder SiC 2730 3.22 Aluminium A 6061 Chip Al 660 2.70 The experiments are conducted on lathe.
Many factors affect the surface condition of a machined part, cutting parameters such as spindle speed, feed rate and depth of cut have a significant influence on the surface roughness for a given machine tool and work piece set-up.
Online since: January 2013
Authors: Hong Kyu Kwon, Kwang Kyu Seo
The proposed method provides useful LCC results of products in terms of product attributes related with LCC factors and product attributes are identified through analyzing the correlation between LCC factors and product attributes.
The product LCC can be decomposed into cost factors.
Table 1 provides a list of cost factors for product life cycle that was adapted to the feasible LCC factors useful for predicting the product LCC [1].
Table 2: Product attribute set Group name Associated product attributes general design properties durability, degradability manufacturing properties mass (mass is represented as the component ratio of 9 materials), volume operational properties assemblability, process disposal/recycling lifetime, use time, energy source, mode of operation, power consumption, flexibility, upgradeability, serviceability, modularity, additional consumables end-of-life properties recyclability, reusability, disassemblability The HLCCM based on GAs and ANNs a different approach to other LCC methods [5].
Eisenhard, in: MS Thesis in Mechanical Engineering, MIT (2000)
Online since: October 2014
Authors: Xue Bin Li, Kun Li
Affect the factor mainly is the size of the pressure drop ratio and Outlet ratio.
Functional Performance: Working mechanism of the cyclone is mainly using the characteristics of flow field of production, including centrifugal force or super gravity and shear properties, etc.
(2) When the Rf smaller or close to zero, as the traditional, solid-liquid separation hydro-cyclone ; When the Rf larger or close to 1, as the Colman-Thew hydro-cyclone, Many factors affect the pressure drop, mainly includes operating parameters such as the inlet Reynolds number Rei, structure parameter Do/D, Du/D, L/D and physical property parameterμandρ.
As a result, the length to diameter ratio may be caused by the three kinds of typical structure of the cyclone the main factors of energy consumption differences.
Factors influencing the flow rate of the Do/D, Du/D, PDR, Re and L/D, but mainly depends on Outlet ratio and pressure drop ratio.
Online since: April 2007
Authors: Wen Cheng J. Wei, Jia Ming Sung, Sung En Lin
Aging time and formulation were two key factors for the control of the aspect ratio of the precipitates.
Besides, the hardness of CeO2 is suitable for semiconductor technique, it recently was used as the media for chemical mechanical planarization (CMP) of Si wafer [4,5].
The cerium element belongs to lanthanide cations, which incompletely occupies 4f-shell, the CeO2 with various types of doping species usually have interesting optical properties and important applications in optoelectronics [6,7].
The [C6H8O7] would affect the morphology of the precipitate, changing from flake-shape (Fig. 3(c)) to bundle-type (Fig. 3(d)).
Conclusions The pH value and [NaOH]/[C6H8O7] ratio of the solution are key factors for the control of the morphology of CeO2 ppt.
Online since: September 2015
Authors: Tomáš Melichar, Jiří Bydžovský
The effects of controlled gradual or shock water cooling were monitored on the basis of physical and mechanical properties.
This concerns both the physical and mechanical properties thereof, as well as the chemical parameters, including microstructural changes.
Degradation also occurs due to effects of extreme temperatures, as well as other factors – the duration and length of heat stress, how the heat is transferred, etc.
An imperceptible percentage of the area was affected by defects in the form of surface area spalling.
[4] M.M Shoaib, S.A Ahmed, M.M Balaha, Effect of fire and cooling mode on the properties of slag mortars, Cement and Concrete Research, Volume 31, Issue 11, November 2001, pp. 1533-1538
Online since: October 2015
Authors: W.D. Teng, Anizah Kalam, Noor Leha Abdul Rahman, Husna Elias, Koay Mei Hyie
BIOMORPHIC CERAMIC HAVE SEVERAL ADVANTAGES OVER CONVENTIONAL CERAMIC SUCH AS EXCELLENT IN COMPRESSION AND FLEXURAL PROPERTIES [6].
THE UNIQUE PROPERTIES OF BIOMORPHIC SIC MAKE IT USEFUL FOR MANY APPLICATION SUCH AS FILTER, CATALYST SUPPORT, TOOLING COMPONENTS AND ALSO LIGHTWEIGHT APPLICATIONS.
Another factor affecting the formation of SiC may be due to the contact angle, θ.
REFERENCES [1] Greil.P, Lifka.T and Kaindl.A., Biomorphic cellular silicon carbide ceramic from wood:I Processing and Microstructure II Mechanical Properties, J.Eur.Ceram.Soc, ,18,pp.1961-1975,(1998)
S, Laminated biomorphous SiC/Si porous ceramics made from wood veneer, Materials and Design 34, pp.528–532,(2012) [4] Milan Gordica,n, DusanBucevaca, JovanaRuzica, SuzanaGavrilovicb, RadmilaHercigonjac, Miroslav Stankovicd, BrankoMatovica, Biomimetic synthesis and properties of cellular SiC Ceramics International 40,pp.3699–3705,(2014) [5] J.Martinez-fernandez and RM.Valera-Feria, High Temperature Compressive Mechanical Behavior of Biomorphic Silicon Carbide Ceramic, Scripta Mater,43,pp.813-818.(2000) [6] J.H.
Online since: May 2020
Authors: Hirotaka Kato, Keitaro Yamamoto, Kazufumi Yasunaga
Burnishing increased the indentation hardness of the nano-crystalline layer by a factor of 3.5.
Introduction Nano-crystalline materials have attracted considerable scientific interest due to their superior mechanical properties (e.g., high hardness and toughness) without alteration to chemical composition.
Li, Mechanical, electrochemical and tribological properties of nano-crystalline surface of 304 stainless steel, Wear 255 (2003) 836-845
Xu, Effect of surface nanocrystallization on abrasive wear properties in Hadfield steel, Tribology Int., 42 (2009) 634-641
Schubert, Effect of Machining Parameters on Surface Properties in Slide Diamond Burnishing of Aluminium Matrix Composites, Materials Today, Proc. 2S (2015) S156-S161
Online since: October 2012
Authors: Wei Jun Yang, Qiu Kong, Hao Qing Wang, Zhou Ping Yu
If the structure is in a vibration condition, the condition will have a direct effect on the stability, functionality and comfortableness of the structure for differences of the structure system form and material properties.
Therefore, this type of free vibration complies with the conservation of mechanical energy.
For reinforced light-weight aggregate concrete beam, its stiffness EI relates to other factors which include elastic modulus of concrete, elastic modulus of longitudinal bar, quantity of reinforcement and the stirrup.
The change of the strength of lightweight aggregate concrete affects the elastic modulus of lightweight aggregate directly.
Building and Environ-ment,2002(37):485 [5] Rosignolo J A.Mechanical properties of polymer-modified lightweight aggregate concrete [J].CCR,2002(32): 329 [6] Chen H J,Yen T,Lia T P,etal.Determination of the Dividing Strength and its Relation to the Concrete Strength in Lightweight Concrete[J]..
Online since: February 2011
Authors: Hai Lang Liu, Yi Ping Huang, Rui Bin Zhang
Structure Analysis of Electron Gun Deflection Coil Based on ProE/ANSYS Hailang Liua, Ruibin Zhangb and Yiping Huangc Institute of Electrical and Mechanical Engineering , Guilin University of Electronic Technology , Guangxi , Guilin, 541004, China aliuhl@guet.edu.cn, bzrb046316@163.com, chyp@guet.edu.cn Keywords: ProE; ANSYS; Deflection Coil; Finite Element Analysis Abstract.
Deflection coil is a key factors , which directly affects the result of the scan, the distribution of the electromagnetic field has a great impact on the deflection of the beam. therefore, we need study its structure and properties.
ProE Mechanical Design module is a highly efficient three-dimensional mechanical design tools.
This numerical method can be transformed into a command stream files format, for the analysis of other similar coil structures, which change the size or core geometry model material properties, we can easily make the appropriate electromagnetic field numerical analysis and get the actual required electron gun deflection coil.
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