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Online since: December 2014
Authors: Jorge de Brito, Miguel Bravo, Jorge Pontes, Luís Evangelista
However, some recent researches indicate that the use of fine RA in concrete may be viable, since it did not lead to a significant loss of the properties, both in mechanical and durability terms.
However, the scale of the strength decrease depends on various factors.
This was expected since, in the water absorption analysis, influenced by the same factors, the same trend occurred.
Pedro, Mechanical properties of concrete produced with recycled coarse aggregates - Influence of the use of superplasticizers, Construction and Building Materials 44, 3013, pp. 101-109
Neville, Properties of concrete, 4th ed. 1995, 844 p
Online since: January 2012
Authors: J.T. Wood, Jonathan P. Weiler, I. Basu
The results clearly indicate that rate of filling, nature of flow of liquid and shape of the mold greatly affect the solidification process and thereby the microstructure.
However, cast magnesium alloys accompany with them, non-uniformly distributed porosity leading to significant variations in the mechanical properties throughout the casting.
Also the variable rate of heat transfer, associated with complex mould geometries, produces a non-uniform microstructure hence affecting the local mechanical properties.
These factors compromise with the part reliability, leading to production inefficiency and degrading vehicle safety.
It is therefore, important to understand the mutual dependency between the process variables, microstructure and properties of the casted alloy.
Online since: May 2015
Authors: Emil Spišák, Ľudmila Dulebová, Oleksandr Grytsenko, Volodymyr Moravskii, Oleg Suberlyak
Such coatings provide products with insulating, antifriction and other properties.
Hydrogel materials on the basis of co-polymers 2-hydroxyethyl methacrylate (HEMA) with polyvinylpyrrolidone (PVP), which offer a complex of valuable properties [1] attract a special attention.
With dispersed metals powders introduction as fillers in polymer matrix structure we can obtain new composite hydrogel coatings, which, depending on the nature of the filler will have a new set of properties [2].
Metallic surface affects the adhesion strength as well.
It is obviously, that the main factor in polymer coating formation is adsorption of monomer molecules and PVP macromolecules on metallic surface.
Online since: August 2016
Authors: Joseph A. Grohowski, Jobe Piemme
This discussion focuses on input controls and testing the outputs of the process from both the perspective of interstitial content and mechanical properties.
Final property consistency (i.e. lot-to-lot chemical and mechanical properties) is critical for adherence to ASTM / AMS requirements.
Property ASTM F2885-11 Requirement Capability (Ppk) Nitrogen <0.05 5.17 Carbon <0.08 2.38 Hydrogen <0.015 2.03 Iron <0.30 2.73 Oxygen <0.20 1.40 Aluminum 5.5 - 6.75 1.87, 3.08 Vanadium 3.5 – 4.5 6.25, 6.83 Yttrium <0.005 below detection limits Titanium Balance Not required Mechanical Properties The most critical output of titanium MIM is meeting the mechanical property requirements of the medical and aerospace specifications.
Below in Table 6 are the results of long term capability of mechanical property.
Titanium powder injection moulding: A review of the current status of materials, processing, properties and applications.
Online since: March 2011
Authors: Yu Mei Ding, Ming Feng Hao, Yong Liu, Xue Tao He, Wei Min Yang
Factors influencing diameter of polypropylene fiber in melt electrospinning Mingfeng Hao1, a, Yong Liu1,b, Xuetao He1,c, Yumei Ding1,d, Weimin Yang1,e 1College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029 China ahaomf@163.com, byongsd@iccas.ac.cn, chext@mail.buct.edu.cn, ddingym@mail.buct.edu.cn,eyangwm@mail.buct.edu.cn Keywords: Melt electrospinning, Polypropylene (PP), thin fibers, temperature, voltage Abstract.
The spinning temperature and voltage are the most important factors that influence the diameter of the fibers in melt electrospinning [5].
Effect of varying temperature on the properties of the electrospinning fibers.
Different spinning temperatures will result in different viscosities of the polymer melt, and thus will affect the diameters of the electrospinning fibers.
[3] Yong Liu, Weimin Yang, Mingfeng Hao: Research on mechanical performance of roof tiles made of tire powder and waste plastic, Advanced Materials Research Vols. 87-88:329-332(2010)
Online since: November 2012
Authors: Takayoshi Nakano, Shinji Ogawa, Dorian Cretin, Ryoichi Suetoshi
To evaluate the bone mechanical characteristics, it is essential to investigate the elastic properties of cortical bone.
However, one problem with artificial hip joints lies in the fact that, because of the differences in mechanical properties between the implant and bone, a stress shielding occurs which is known to lead to bone loss [1].
However, there have been few studies concerning the change of elastic properties in bone surrounding implants.
For example, the Speed of Sound (SOS), at which ultrasounds propagate inside bone, is known to reflect such properties [8].
The elastic properties of the cortical bone are important to the assessment of the mechanical function of bone.
Online since: March 2018
Authors: Darika Jaaoh, Roseleena Jarawae, Maimoon Intan, Huseng Chaidana
The morphology along with electrical and mechanical properties, and specifically the electrostrictive coefficient, were studied.
The increase of the permittivity is one of the key factors for increasing the capability of electrostrictive polymers.
The host matrix provides the mechanical properties, while the conductive fillers provide conductivity to the composite.
The mechanical properties of the neat NR and NR/Graphene composites.
This results showed a closely relation of the electrical and mechanical properties with the electrostriction effect.
Online since: November 2012
Authors: Li Min Zhou, Zhao Jun Meng, Li Ping Xue, Yue Jun An
The optimize design and experiment show that the new structure motor efficiency and power factor higher than the previous configuration of the asynchronous motor, and with high-efficiency and energy-saving advantages in a very broad power output range at the condition of same load.
The structure of under each pole setting permanent magnet slot easily lead to polar disorder when assembling, at the same time, in order to reduce magnetic flux leakage, the interconnection part very small of the rotor core punching what making the rotor mechanical strength will be low and affecting the stability and reliability of operation, all of these direct restricted the use and promotion of this type motor.
This kind of rotor structure overcome the shortcomings of current permanent magnet and improved rotor mechanical strength, increased anti-magnetic ability, enhanced stability and reliability of running under the premise of realization high-efficiency and achieve high power factor.
The basic properties of permanent magnetic materials NdFeB as following: residual magnet, coercively, intrinsic coercively, temperature coefficient,, stabilized operating temperature, Curie temperature , consistency of magnetic properties .
From the results can be seen, the new motor has higher efficiency and power factor, and has very broad power output range with high-efficiency and energy-saving advantages.
Online since: April 2012
Authors: Xing Ming Huang, Yan Jun Zhao, Shu Guang Li, Cheng Xu
School of Mechanical Engineering, Shandong University of Technology, Zibo 255049) (2.
Introduction Weapon firing process is a typical stress and motion process of complicated mechanical system, during firing weapons were subjected to cyclic frequency dynamic load and high temperature, high pressure.
The key parts performance is affecting weapon of shooting the smooth realization, fire safety and the effect of firing accuracy of important factors.
The FEM must be fully reflect the actual structure mechanical properties, the concerned parts is less simplified, Away from the key parts is quite simplified.
Table 1 Unit number, note number of the main parts Load analysis In the course of shooting, weapon affected by multiple forces that is obtained by virtual simulation shown in literature 4 and 5, these data are processed, are dimensionless unit.
Online since: June 2012
Authors: Wu Bin Li, Chang Hou Lu, Jian Chuan Zhang
It is a critical factor which affects the input of machine vision.
Because it affects the quality of input data and application affect at least 30%.
To design a good performance light system, there are four factors to be considered which is as follows: (1) The field of vision for camera This is dependent on the scope of the detecting object.
LED source has good characteristics in many factors
Journal of Mechanical Engineering.
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