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Online since: April 2015
Authors: Yang Liu, Meng Zhou Zhu, Cheng Gang Li, Jian Jun Liu
The operating experience shows that the electrical property, mechanical property and stability of most of the LSR can meet the needs of power equipments to run for a long time.
Investigation results suggest that there are lots of factors affecting the silicone rubber aging, in addition to the prescription and process of silicone rubber, also including the partial discharge, high temperature, ozone, ultraviolet radiation, rain, pollution, wind speed, and so on.
However, most studies of the factors affecting the aging of silicone rubber have focused on the HTV and Room Temperature Vulcanized Silicone Rubber (RTV), and there have been relatively few studies on the LSR.
The aging characteristics, aging factors, aging prevention measures and treatment after aging of LSR will obviously require further investigation.
(3) The change law of the chalking layer thickness, the long chain content, the crosslinking degree, the side chain methyl number, the thermal decomposition properties and the organic ingredients can be clearly observed in the process of LSR aging analyzed by using SEM, FTIR and TG.
Online since: June 2010
Authors: Janusz Ryś, Małgorzata Witkowska
The interaction of both phases upon deformation exerts fairly significant influence on structure and texture formation in both constituent phases and in consequence affects the material properties and its behavior upon further processing.
In general, deformation mechanisms operating within the bands of ferrite and austenite depend on a number of factors like chemical composition, stacking fault energy and initial orientation distribution.
The thermo-mechanical pretreatment included additionally solution annealing at the temperature 1150°C for 3 hours with subsequent water quenching.
With increasing reduction another structural effect was observed, that is the micro-shear bands formed on a background of mechanical twins (Figs.5,6) [6].
Among the important factors, which should be taken into account when analysing a deformation behavior of duplex type steels are preferred orientations after a thermo-mechanical treatment and a development of deformation textures within both phases in the course of cold-rolling.
Online since: January 2016
Authors: Nor Asiah Muhamad, Hanafiah Kamarden
Power and Dissipation Factor measurement are done to investigate the insulator properties, winding and bushing conditions [21][22].
Accuracy- Power and Dissipation Factor measurement, Common Electrical Tests, and FRA are regularly used to point out the abnormalities from the core, winding and bushing for mechanical deformation detection.
Ghani, “Parameters Affecting the Lifetime of Transformer Oil in Distribution Transformers : Parameter Monitoring of 50 Transformers from the Athens Area,” no.
Liso, “Research of electrophysical properties of oil-paper insulation,” IEEE, no. 1, pp. 0–3, 2014
Onal, “A Study for Examining Dissipation Factors of Various Insulations and Test Transformers in the Wide Range of Frequency,” vol. 5, no. 5, 2012
Online since: April 2018
Authors: Viritpon Srimaneepong, Mana Sriyudthsak, Yaninee Kosaiyakanon, Fan Pui Luen, Kamolporn Wattanasirmkit
Most previous studies concentrated on various properties like mechanical properties, solubility or bonding ability of dental cements [1,2], but few have been conducted on this electrical property of dental cements [3].
This indicates that the high bias voltage of 125 V did not affect the electrical property of the specimens in this study.
Other factors affecting the solubility of resin cements depended on the monomer conversion rate, residual monomer, resin matrix, and a lower rate of polymerization [11].
Clinically, the solubility of dental luting cements affects their mechanical properties and will affect the longevity of the prosthesis.
Braden, Dielectric properties of glass ionomer cements, J Dent Res. 60 (1981) 1311-1314
Online since: May 2021
Authors: Qiang Liu, Shi Dong Zhu, An Qing Fu, Xin Yu Wang, Jin Ling Li
Among titanium alloys, TC4 (TI-6Al-4V), a strong α+β titanium alloy, has excellent comprehensive mechanical properties, and can be used for a long time at 400 oC [2].
While titanium alloy OCTG will face acidizing fluid and producing fluid (including H2S, CO2), temperature, pressure and other factors.
Effect of annealing temperature on microstructure and mechanical properties of large diameter TC4 titanium alloy seamless tube[J].
Study on corrosion electrochemical properties of titanium alloy tubes in severe environment[J].
Structure, mechanical and tribological properties of self-toughening TiSiN/Ag multilayer coatings on Ti6Al4V prepared by arc ion plating[J].
Online since: September 2007
Authors: Dong Xia Lei, Zhi Ying Ou
This approach considers that the main factor affecting the stress field of composites is the existence of interphase between fiber and matrix, which possesses different Young's modulus than those of the constituent phase.
Introduction The most fundamental problems in composite materials are calculating stress field in terms of the properties and relative amounts of the individual materials or phase.
The stress field is an important aid to modeling the micromechanical performance of composite such as failure analysis and prediction of mechanical properties.
The characterization of fiber-reinforced composites is depended separately on the properties of fiber and matrix, as well as on the fiber-matrix and fiber-fiber interaction.
The problems in which the properties of interphase vary continuously have been studied by many researchers.
Online since: December 2011
Authors: Leo A.I. Kestens, Roumen H. Petrov, Hadi Pirgazi
Magnetic properties of electrical steels such as magnetization behavior and electrical losses are mainly related to chemical composition, crystallographic orientation and microstructure.
By now, several models have been proposed to empirically correlate magnetic properties and affecting parameters.
Introduction It is well known that the magnetic properties of electrical steels such as magnetization behavior, electrical losses, permeability and coercivity are related to the microstructure, chemical composition, texture and the mechanical conditions (e. g. stresses) of the laminations in the core [1].
Between all the microstructural parameters, grain boundaries, inclusions and surface defects have a strong influence on magnetic properties by pinning the motion of domain walls and increasing the coercive force of the material.
However, more research work needs to be done on more samples to find a physically based formula, which describes the combined effect of the microstructural and magnetic field variables on the magnetic properties.
Online since: May 2011
Authors: Boonchoat Paosawatyanyong, Satreerat K. Hodak, K. Kamlangkla
Plasma treatment, well known as a dry process with less or without waste water or wet chemicals, can be used to modify surface fabrics in the nanometer scale, range from several hundred to several thousand angstroms, without affecting their bulk properties. [2] Many kinds of gases can be used in plasma process such as Ar, O2, N2, CO2, etc. [3-6] Ions and neutral species in plasma would collide with the molecules on the surface lead to chemical interaction with surface molecules, generating new functional groups and radicals.
Tensile strength is a mechanical property to measure the maximum force that material can withstand before rupture.
Considering the weight loss results in last section, although changing in tensile properties might result from the effect of increasing in fiber-to-fiber friction due to increased roughness, it is more reasonable to believe that the loss of material are responsible for strength reduction.
The elongation at break of the fiber is also an indicator on the durability of the fabric and is an important factor which associated with the tensile properties.
The exposure time plays an important role in the change of mechanical properties of fabric while the operating pressure having less prominent effects.
Online since: March 2021
Authors: Sami D. Salman, Adnan H. Rasheed, Hajar Alias
Thermophysical Properties for ZnO-Water Nanofluid: Experimental Study Adnan H.
The thermophysical properties, including viscosity and thermal conductivity, were measured by using Brookfield rotational Viscometer and Thermal Properties Analyzer, respectively.
The result indicates that the thermophysical properties of zinc oxide nanofluid increasing with nanoparticle volume fraction increasing, as well as the thermophysical properties of zinc oxide nanofluid affected by the change in temperature.
Journal Of Mechanical Engineering And Sciences. 2017 Dec 1; 11:3087-94
Thermophysical properties and stability of carbon nanostructures and metallic oxides nanofluids.
Online since: October 2014
Authors: Shahrul Azam Abdullah, Juri Saedon, Muhamad Sani Buang
The factors involved in the process are punch radius, die radius, die gap, punch travel and punch velocity.
The aim of this paper is to investigate the factors that affect the springback behavior of stainless steel in air V-bending using Finite Element Method (FEM) software Simufact-FormingTM version and material database MatILDa.
The amount of springback influence identifies by many factors such as tool shape and dimension like punch and die radius, die gap, punch travel, bending force and sheet thickness.
The mechanical properties of the stainless steel 304 by a uniaxial tensile test are shown in Table 2.
The mechanical properties of Stainless Steel 304.
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