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Online since: March 2019
Authors: Jian Ping Zhao, Ze Xun Hu, Ying Jie Zhang
Material properties.
As shown in Fig.2, the thermal properties (including thermal conductivity λ, specific heat capacity C ) and the mechanical properties ( including yield stress σy, elastic modulus E, Poisson’s ratio ν, the coefficient of linear thermal expansion α) are provided.
During MT, the microstructure of the material will change, so the material properties will be different.
At the beginning of the welding, the material properties of parent metal are utilized.
When the temperature cools to MS, the material properties of weld metal are utilized.
Online since: April 2014
Authors: Jia Chun Wang, Ming Ming Xin, Si Yu Cao, Teng Zhao
During ultra-precision cutting of brittle materials, the wear of diamond tool seriously affects the quality of machined surface.
Consequently, the ductile cutting mode will change into brittle mode, which will affect the dimensional accuracy, surface accuracy and quality of machined surface of the workpiece[1,2].
Micro-chipping is one of them caused by multiple factors, among which the graphitization of tool is an important aspect.
[7] Tersoff J, New empirical model for the structural properties of silicon, Physical Review Letters. 56(1986) 632-635
Study of some physical concepts and influence factors about the thermal stability of diamond, Diamond & Abrasives Engineering. 5(1997) 5-7
Online since: May 2014
Authors: Hui Wang, Jiu Peng Zhang
In order to prevent the reflective cracking, three main factors are taken into account. (1)The SBS modified asphalt used in the wearing course of AC-13 is with the amount of 5.5% SBS.
The asphalt concrete with high addition SBS modified asphalt is of good high temperature performance, good low temperature performance and good fatigue property. (2)Open-graded large-stone asphalt mixes LSAM-25 is of large air voids.
Mechanical response and life expectancy analysis of asphalt overlay Mechanical Response of Asphalt Overlay Based on the temperature parameter of Xia-Fen expressway and Eq.1, we gets the temperature stress of asphalt overlay (superposition of temperature stress caused by shrinking constraint of the surface course, contraction deformation of the base and warping of the base)
The Influence of Disengaging to Life Expectancy of the Asphalt Overlay One of the influence factors that affect the load stress of asphalt overlay is disengaging under the old cement concrete slabs, which can express by λk (the ratio of foundation strength under the corner of the slabs to the middle of the slabs).
Furthermore the factors that influence the reflective cracks are traffic volume and heavy load.
Online since: June 2012
Authors: Kent A. Harries, Michael J. Richard
Nonetheless, these factors can be accounted-for using fundamental mechanical principals.
Moisture content was considered to be the most important property in governing mechanical properties and was taken as either natural (N) or wet (W) which was achieved by immersing the bamboo in water for 1 week prior to testing.
To calibrate the proposed design method, an analysis was conducted against the test data with all partial safety factors equal to 1.
The analysis determined Robertson constants, modified slenderness ratios and average model factors for each species.
[10] International Organisation of Standards (ISO), ISO 22157-1: Bamboo – Determination of physical and mechanical properties – Part 1: Requirements, 2004
Online since: June 2014
Authors: Bin Fang, Zhong Gang Zhang, Xiao Qing Li
The long-term operation, tooth wear, bites and deformation, dynamic meshing backlash is too large, poor engagement will produce vibration, shock and noise, these are the main factors of mechanical transmission noise. 1.1 Noise species Noise of gear transmission system can be divided into acceleration noise and ring noise.
While the gears need to transfer small load, we should choose small modulus as possible, because the machining error at this time are the main influence factors; and small modulus usually with more teeth, gear coefficient increases, which can improve the stability of the transmission, noise reduction
Therefore, reasonable design of box body include Structure and vibrational properties will help to reduce the noise of gear system.
Beijing: Mechanical Industry Press, 1998 [2] Zhao Ning, Wei Fang, Hui Guang Lin, Kang Shipeng.
Beijing: Mechanical Industry Press, 1986
Online since: January 2023
Authors: Yohanes Edi Gunanto, Maya Puspitasari Izaak, Henni Sitompul, Wisnu Ari Adi, Yosef Sarwanto
Ferrite is one of the magnetic materials that has dielectric properties, so it can be used as an absorber of electromagnetic wave energy [5].
Some of the factors that affect the value of the three magnetic parameters are the method of manufacture, particle size which depends on the given temperature, morphology, and chemical composition.
Ramesh, Preparation of Cr3+-Substituted NiFe2O4 Nanoparticles and Its Microwave Absorption Properties.
Markaneyulu, Cationic ordering and magnetic properties of rare-earth doped NiFe2O4 probed by Mossbauer and X-ray spectroscopies, J.
Ding, Hydrothermal Synthesis and Microwave Absorption Properties of Nickel Ferrite/Multiwalled Carbon Nanotubes Composites.
Online since: March 2023
Authors: Josef Kasl, Růžena Fikrlová, David Aišman
Material and testing methods The metal guiding and casing are manufactured with the requirement of good mechanical properties resistant to the internal overpressure of the expanding wax and high thermal conductivity facilitating heat exchange between the refrigerant and the wax, so brass is usually used.
Results showed that the distribution of mechanical properties in the casing wall is very uneven.
The factors affecting SCC: a) Alloy – the composition, microstructure and heat treatment of alloy, effects SCC occurrence. b) Stress – there is a threshold stress below which cracking will not occur.
The reason was the simultaneous influence of several negative factors: - in addition to the stress caused by the overpressure of the molten wax, a higher level of residual stresses caused by deformations can be expected in the places where the thermostat is calibrated or where the guiding is pressed into the casing (i.e. at the crack positions)
Roland, Mechanical behavior of rubber at high strain rates, Rubber chemistry and technology, 79 (2006)
Online since: September 2013
Authors: Jun Peng Gao, Yu Xi Jia, Ling Luo, Zhao Jing Wang, Xiao Xia Wang, Xiao Su Yi
This paper aims to analyze Polyurethane’s shape memory properties based on the viscoelastic theory.
As the results show, Polyurethane’s shape recovery ratios are almost 100%, whereas shape fixing properties are relatively poor.
Earlier focuses on shape memory polymers and their composites were the recovery strain, the recovery stress and their influencing factors during different kinds of shape memory processes[[] Y.P.
Mater. 33 (2001) 545-54. ], while there is a focus on recovery time and its influencing factors using experimental methods[4,[] R.
As the calculated results show, the model describes Polyurethane’s creep, relaxation and shape memory properties well.
Online since: August 2013
Authors: Yu Feng Chen, Gang Yin
Relationship between Short Term Traffic Flow Chaos Fractal Properties and the Necessary Data for Prediction Gang Yin1, Yu Feng Chen2 1.
School of Measurement-Control and Mechanical-Electrical Engineering Inner Mongolia Vocational College of Chemical Engineering Hohhot, China 2.
The point given in TABLE I is required by nonlinear properties of traffic flow sequence, and it does not include the special case that special identification method requires more historical data.
Only considering the different speed of difference vehicles, when we observe the simple model of two factors of the time window T, we can explain the variation in minute scale D2 and λ1 which happened in traffic flow of point B.
Previous studies suggest that it would cause the disappearance of fractal nature; however, this study does not support this opinion; we propose a simplified model which can qualitatively explain some of the causes of the chaos in traffic flow characteristics, and the causes are that the speed difference is the main factor to affect the correlation dimension in minute scale observation window.
Online since: October 2007
Authors: Sadahiro Tsurekawa, Tadao Watanabe, Kota Kido, Koichi Kawahara
However, it is well known that the presence of grain boundaries affects and degrades the energy conversion of polysilicon.
Fortunately in the last two decades, more basic and systematic investigations of structure-dependent electric and mechanical properties have been made for semiconductors [2,3] and electroceramics [4], as discussed later.
For this purpose, basic knowledge of structure-dependent grain boundary properties is indispensable.
This paper reports some new results from experimental work on the control of grain boundary microstructure and bulk electric properties by unidirectional and rotational solidification from the melt.
Accordingly the grain boundary character distribution (GBCD) and the geometrical configuration of low-energy and high-energy boundaries are key factors controlling the performance of polysilicon
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