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Online since: March 2015
Authors: Gianluca Buffa, Antonino Ducato, Livan Fratini, Davide Campanella
In particular, the following aspects must be taken into account: thermo-mechanical analysis of a material undergoing a heating stage coming from friction conditions and plastic deformation; complete material definition able to provide accurate prediction of material properties as function of temperature (especially in the case of multi-phasic materials); complex boundary conditions for both thermal and mechanical evolutions of the system [5].
A qualitative agreement in the shape of the heat-affected zone between numerical models and welded specimens was showed.
Frost, On the extrusion stage of linear friction welding of Ti6Al4V, Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 271 (1999) 477-484
Frost, Modelling the linear friction welding of titanium blocks, Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing, 292 (2000) 8-17
Velotti, Beta Forging of Ti-6Al-4V: microstructure evolution and mechanical properties, Key Eng Mater, 554-557 (2013) 359-371
Online since: August 2007
Authors: Masanori Kikuchi
Mechanical properties and chemical compositions of this material are shown in Table 1 and Table 2.
Table 1 Chemical Component Of A533B Steel C Si Mn P S Ni Mo 0.22 0.32 1.46 0.01 0.01 0.60 0.57 Table 2 Mechanical Property of A533B Steel Young's modulus Yield stress Tensile strength E � ys � B 206[GPa] 599[MPa] 720[MPa] � � � � Fig.1 Three point bend specimen Fracture surface observation Fracture surface is observed after dimple fracture test.
It means that shear stress affects the growth of voids near specimen surface.
In these numerical simulations void growth is assumed to be due to two factors.
J.Fracture, 47(1991), 105 [7] JSME Standard S 001-1992 (1992), Japan Society of Mechanical Engineer [8] Koers R.
Online since: September 2019
Authors: Artem Kim, N.E. Ozerskoi, Pavel Alexandrovich Novikov, Qing Sheng Wang, Anatoly Anatolyevich Popovich
Introduction Science and technology development causes the need for ceramic materials with thermal and chemical resistance, high thermal conductivity, good dielectric and mechanical properties [1,2].
Fig. 3 Particle image with different magnificient (scanning electron microscope) а – experiment 5, b – experiment 9 Small yield of aluminum nitride nanopowder in experiments 1-8 (table. 1) due to two factors.
Further experiments with a higher concentration of melamine in the initial mixture were not carried out due to the fact that soot was deposited on the surface of nitride particles, which significantly reduces the electrical insulating properties of the material.
It is determined that the flow rate of the сentral and the composition of the sheath gases, as well as the point of powder injection into the plasma do not affect the AlN output.
Thermal Plasma Spheroidization of High-Nitrogen Stainless Steel Powder Alloys Synthesized by Mechanical Alloying // Metals and Materials International. 2018.
Online since: October 2015
Authors: Wui Wenn Tay, Siao Phin Lim, Mohd Ashraf Mohamad Ismail
The induced ground movements might affect the pile foundations which support structures on the surface.
Pile-tunnel interaction is influenced by several factors such as tunnel radius, soil properties, depth of tunnel, pile geometry, distance between pile and tunnel, groundwater, soil condition and etc.
However, this method is unable to directly account for the effect of different soil properties, ground conditions, construction methods and tunnel-soil structure interactions.
The soil properties and soil parameters used in the analysis are shown in Table 1.
(1) (2) Table 1: Soil parameters [5], tunnel lining properties [6] and mechanical properties Of bored pile [7] Material Cohesion c’ (kPa) Friction angle ϕ' (o) Elastic Modulus, E’ (MPa) Poisson Ratio, ν Unit Weight, γ (kN/m3) Alluvium 0 30 17.5 0.3 18 Residual Kenny Hill Soil 5 33 75 0.3 21 Concrete Lining - - 35000 0.25 25 Bored Pile - - 30000 0.25 24 Figure 1: Construction stages in numerical models Results and Discussion Evaluation of Surface Settlement.
Online since: August 2010
Authors: Min Seok Moon, Myeong Han Yoo, Chan Won Kwak, Kee Do Woo, Jin Won Han
Graphite has a few benefits that good corrosion resistance, conductivity and contact resistance.[3] Nevertheless graphite has several disadvantage that low permeability, mechanical properties, expensive cost and huge volume. [4~9] This paper applies Metallic bipolar plate material for austenite stainless steel 304 was used.
The aim of this paper, raw material has different surface preparation conditions, when the investigation of corrosion behavior and electrochemical properties. 1.
Typically, potentiodynamic polarization experiments and electrochemical properties of the metal material evaluation methods have been used.
And the other peaks are not affected in the corrosion test was confirmed.
In other words, As-Received specimen grain boundaries, many of which have brought an increase in the corrosion rate and electrochemical properties are also highly Icorr value is considered to be the cause.
Online since: August 2014
Authors: Jing Qian, Ling Wei Meng
The superpave gyratory compactor produces compacted cylindrical test samples of the asphalt paving-mix for determining volumetric and mechanical properties.
The precision of the compaction angle can be affected by many parameters.
The angle-adjustment mechanism is compelled to move along a circular orbit by the kinematic properties of the machine.
It helps engineers to study the dynamics of moving parts, and how loads and forces are distributed throughout mechanical systems.
The assembling accuracy of connecting points (A, G, F, and D) is another important factor which affects the movement accuracy of the mechanism.
Online since: September 2016
Authors: B.K. Cho, S.H. Han, G. Korotcenkov
It is given the analysis of the factors that reduce the effectiveness of the composites using in conductometric gas sensors, which should be taken into account while designing and fabricating sensors based on metal oxide composites.
Moreover, the most significant changes in the properties of the gas sensors occur at concentrations of additives, which are close to the solubility limit of МеII in MeIO [28].
For example, Gaskov and co-workers [17, 18, 31], who studied SnO2-based composites with additives such as Fe2O3, MoO3, RuOx, Sb2O5, NiO, La2O3, CuO and V2O5, have found that additives in addition to influence on structural properties of gas sensing matrix affect a redox properties and acidity/basicity of the surface.
At that the studies devoted to a detailed analysis of the composition influence on the gas sensing properties of the composite-based sensors is insufficient for reliable conclusions.
As a rule, the majority researches study composites with a limited number of variations in the composition, which does not give a true picture of the composition's influence on the gas sensing properties, necessary for determination of the composites, which are really optimal for different applications.
Online since: January 2018
Authors: Zulfairul Zakariah, Mohd Baharufin Ridzuan, Nurul Amira Md Nordin, Zawawi Daud, Zulkifli Ahmad
The chemical modifications of fibres were carried out in order to improve mechanical properties of composites and adhesion between the fibres and matrix [9].
[5] Kasiviswanathan S.et. al, (2015) Evaluation of mechanical properties of natural hybrid fibers, reinforced polyester composite materials.
Tensile properties of kenaf fiber due to various conditions of chemical fiber surface modifications.
Effect of kenaf fibre modification on morphology and mechanical properties of thermoplastic polyurethane materials.
A review on chitosan-cellulose blends and nanocellulose reinforced chitosan biocomposites: Properties and their applications.
Online since: February 2013
Authors: Pedro Vieira Gamboa, F. Couceiro, J.M. Silva, A.D. Guerman
According to the information in the manufacturer´s datasheets [11, 12], a value of 3.5GPa is stipulated for the Young modulus, 0.38 for the Poisson ratio and 1350 kg/m3 for the density, as these represent average properties values for the different types of Mylar® films available in the market.
Acknowledgments This research is supported by the Portuguese Foundation for Science and Technologies (FCT), the Portuguese Operational Programme for Competitiveness Factors (COMPETE), the Portuguese Strategic Reference Framework (QREN), and the European Regional Development Fund (FEDER).
Forward; “Solar Photon Thrustor”; Journal of Spacecraft and Rockets, Vol. 27, No. 4; 1990; pp. 411-416; [4] A.D.Guerman, G.Smirnov, Comment on “Compound Solar Sail with Optical Properties: Models and Performance”.
AIAA-99-1272; [9] Yan Xu and Fu-ling Guan, “Structure design and mechanical measurement of inflatable antenna”; Acta Astronautica 76 (2012) 13-25
[11] Typical Physical and Thermal Properties of Mylar® Polyester Film; http://usa.dupontteijinfilms.com/informationcenter/downloads/Physical_And_Thermal_Properties.pdf, last access: February 8, 2012
Online since: November 2011
Authors: Wei Wang, Yan Ming Li, Xing Quan Liang, Yu Min Du, Bao Feng Lin
The solution properties and moisture absorption-retention abilities of the salts were compared with chitosan.
The properties of the salts were related to the type of carboxylic acid added and the formation of salt bond.
In this paper, their structures were characterized and their properties were also evaluated.
Solution properties.
The intermolecular hydrogen bonds of molecular chains, which affect the interaction between water and polymer chains directly, may be a very important factor to regulate moisture absorption-retention abilities of CCS.
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