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Online since: September 2005
Authors: B.D. Stojanović, Vera P. Pavlović, Maria V. Nikolić, Vladimir B. Pavlović, Nebojsa Labus
Introduction Due to its dielectric constant value and ferroelectric properties, barium titanate is one of the most important materials in the electronics industry and is mainly used in the production of multilayer capacitors and electronic devices [1].
A major difficulty in processing electroceramic materials with required properties is the lack of reproducibility.
In order to achieve reproducible properties of these materials control of processing conditions and development of specified microstructures is essential.
According to Su and Johnson [6], since "different powder and green-body processes result in differences in particle size, particle size distribution, initial pore size distribution, packing properties", thus affecting densification behavior, the MSC can be applied only to powder compacts made from the same powder and the same green-body processing.
This research was performed under the Project No. 1832 entitled "Synthesis of functional materials from the 'synthesis-structure-properties-application' relationship", financed by the Ministry of Science and Environmental Protection of the Republic of Serbia.
Online since: July 2007
Authors: Jean Savoie, Melinda Bissinger
The metallurgical integrity and mechanical properties of these parts are thus crucial.
Most importantly, material properties (mechanical and metallurgical) must not vary significantly to avoid repeating the certification process.
It seems the machining process has induced sufficient deformation in the front flange to affect the properties.
Metallurgical and mechanical investigations are under way to ensure proper properties of the flowformed duct.
The resulting microstructure and properties are equivalent.
Online since: July 2024
Authors: Nazatul Liana Sukiman, A.S.M. Abdul Haseeb, Nur Amirah Mohd Zahri, Tadashi Ariga, Yukio Miyashita
Apart from that, the metal foam has superior weight-specific properties, high energy absorption and sound absorption.
These properties give wide opportunity for metal foam to be employed in different fields include electronics, chemical, machinery and aerospace [4].
An insight mechanical properties and microstructure analysis of Cu substrate and foam brazed joint interface were investigated.
Mechanical properties for brazing of sandwiched Cu foam between Cu (a) Compressive strength (b) Shear strength of brazed joint interface.
Cu foam structure (a) 15 PPI (b) 25 PPI and (c) 50 PPI Mechanical properties like compressive and shear strength are important and have their own role in heat exchanger application.
Online since: February 2013
Authors: Guang Bin Wang, Xue Jun Li, Fu Ze Xu, Yi Lin He
Modeling and Analyzing for Rotor System with Imbalance–Misalignment Coupling Faults Based on Nonlinear Finite Element Method Fuze Xu1,a, Xuejun Li2,b, Guangbin Wang3,c, Yilin He4,d 1,2,3Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan, 411201, China axufuze12@163.com, bhnkjdxlxj@163.com, cjxxwgb@126.com, dkuoyelin.21@163.com Keywords: Rotor System, Coupling Faults, Misalignment, Newmark-Beta Abstract.
It also studies the influence of the unbalance, misalignment and coupling faults to the system by applying the dynamic response chart and time-frequency properties.
Introduction Rotor system is an important component for the rotating machinery, its condition directly affect the entire system state.
When Analysis the system response full consideration has been taken by gravity, moment of inertia, gyroscopic moment factors and so on, and set bearing place damping is 0.02 N.S/mm [5].
Rolling bearing of the unbalanced rotor system nonlinear dynamic response analysis, The Chinese mechanical engineering (2007), Vol.18(23):2773-2778
Online since: July 2024
Authors: Laura W. Simiyu, Patrick I. Muiruri, Bernard W. Ikua, Simon N. Gacharu, James M. Mutua
An IM phase involving filling of the injection mold’s cavity with molten plastic is computed using a middle-plane two-dimensional equation employed for non-Newtonian fluids, that are also incompressible, under non-isothermal properties for polymers [28].
The selection of Taguchi method was based of its accuracy in analyzing results from a limited number of experiments involving more than two factors.
The possible reason for this could be that the depth and pitch are mathematical factors of the diameter hence are directly affected by a change in the value of the diameter.
Amongst the variable factors in CCS-CCC design (diameter, depth and pitch), the diameter was the only significant factor affecting all the multiple responses, with a contribution of 80.26 %. 3.
[5] Autodesk, 11 Factors for Efficient Mold Cooling: Balancing speed and quality to reduce cycle time, (2017), 1-24
Online since: December 2014
Authors: Jarosław Chmiel, Roman Jędrzejewski, Arkadiusz Rzeczycki, Jolanta Baranowska
Example of pressure changes caused by implosion on the surface of a pressure pickup [2] The role of stresses in the process of hydrogen absorption and diffusion in metals and the influence of adsorbed hydrogen on mechanical properties of metals has been discussed in many publications [3-12].
The method used allows to observe that when a material is affected by cavitation, the states of stress vary and depend on depth.
Numerical models indicate that essentially changed properties can be found in an area of extreme parts of microvolumes affected by a microjet or shock waves generated by cavitation.
Migration of positive charges affected by implosion of a cavitation bubble [20] Fig. 9.
At the macroscopic level the deciding factor is a change in hydrogen concentration close to the crack bottom [24].
Online since: May 2011
Authors: Huan Jun Ye, Zhi Wei Sun, Wei Chen, Jun Wang
Test Results and Theoretical Analysis Cracking Development And Factors.
The Calculation Method of Crack Width Based on test results and the principle of composite materials, the multiply of the volume ratio and the aspect ratio of fiber which is the main parameter to affect the mechanical properties of fiber concrete can be defined as the characteristic parameter of basalt fiber [5] and can be expressed as: (1) The nature that the crack width was decided with the strain differences of the reinforcement bar and concrete between the main cracks won't change, even though the maximum crack width changes with diversification of characteristic parameter of basalt fiber.
It is the characteristic parameter of basalt fiber that the main factor to affect the effect on preventing the crack of basalt fiber.
Online since: October 2010
Authors: Isabel Castanheira Silva, João Paulo Castro-Gomes, António Albuquerque
Bed materials frequently present clogging problems whose causes are related to the variation of its properties (e.g. compressive strength, specific surface area, void fraction and porosity), the release of fine material, excess of particulate matter and suspended solids and the development of precipitates [1] leading to resistance to flow and, therefore, to the decrease in treatment.
It is a potential material for WWTP due to its high strength, good durability, low shrinkage, sulphate and acid resisting properties.
Pratt, Factors affecting the strength of alkali-activated slag, Cem.
Kriven, J. van Deventer, Understanding the relationship between geopolymer composition microstructure and mechanical properties, Colloids and Surfaces A: Physicochem.
Lukey, The effect of composition and temperature on the properties of fly ash- and kaolinite-based geopolymers.
Online since: March 2016
Authors: Jing Hui Song
Vickers hardness can be used to evaluate the mechanical properties of the welding head, whose diamond indenter was adjusted at the angle of 136°.
During the welding process, the water absorbed in oxide film may produce blowhole, which can undermine the homogeneity of the metal and reduce the mechanical properties of the joints.
Aluminum alloy possesses the advantages of strong oxidizing capacity, high thermal conductivity and electrical conductivity, large line expansion coefficient and relatively low strength, etc, these factors may cause difficulties for welding.
Preparation and properties of Fe-based bulk metallic glass.China Building Materials Science and technology. 17 (2008) 68-71
Ko, Structure and Mechanical Properties of CP Ti and Ti-6Al-4V Alloy Brazed Joints with Ti-Base Amorphous Filler Metals, Quarterly Journal of the Japan Welding Society. 5 (1987) 21-27
Online since: December 2013
Authors: M.H. Maslan, M.A. Sheikh, S. Arun
Primary factors have a direct effect on the fretting process, whereas the secondary factors are only indirectly linked to the primary factors.
Table 1 gives the elastic properties of these materials.
Materials Properties.
Fatigue properties for 2014-T6/651 Aluminum alloy [11].
This research has found two factors to be responsible.
Showing 17741 to 17750 of 26166 items