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Online since: May 2022
Authors: Hamdan Hasanudin, Abdul Hamid Nurfaizey, Mohd Hanafee Zin, Siti Hajar Sheikh Md Fadzullah, Syazwan Ahmad Rashidi, Nadlene Razali
To simulate the simulation, there are several factors and parameters need to be considered so that the defects could be avoided due to the excellent and poor formability will be linked between the fabricated samples in Aniform and the manufactured products.
Introduction Fairings, flight control surfaces, landing gear doors, leading and trailing edge panels on the wing and stabilizer, interior components are the examples of composite utilization in aircraft [1] while the uses of Polyphenylene Sulfide, PPS has attracted much attention in the past several decades due to outstanding thermal stability, superior toughness, inherent flame resistance, excellent chemical resistance, high mechanical strength, dimensional stability and also good in electrical properties [2].
In another word, author [13] mentioned the temperature history has to be modeled first by two approach of integration thermal equilibrium and staggered approach has to be conducted on mechanical and thermal equilibrium where the characterization melt over wide temperature range has been addressed to characterize on inter-ply friction, intra-ply shear and bending.
This might due to, defects may not only affected by drapability and deformability of composite at certain temperature, but auxiliary equipment like tensioners, stamping speed, shape of mold with curvature, orientations of composite may also contribute to the formation wrinkles, stress and also ununiform thickness variation of geometry during the thermoforming process [14].
Summary PPS would be used for the thermoforming process at its processing temperature of 320°C within the range 2 MPa to 4 MPa on its pressure under thermoforming pressure based on the consideration of glass transition temperature and melting temperature on the thermoplastic property under the hot-pressed machine.
Online since: August 2014
Authors: Hong Ya Li, Tian Tian Zhang, Biao Yan
The catalytic properties of copper catalysts prepared by coprecipitation method Hongya Li 1,a, Tiantian Zhang 2,b, Biao Yan 3,c 1School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China 2College of Chemistry and Chemical Engineering, Longdong University, Gansu 745000, China 3School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China a lihongya0521@163.com, bzhangttbetter@126.com , bdonghuhai@qq.com Keywords: Acid Red B, coprecipitation, catalytic wet air oxidation, wastewater Abstract: A series of copper catalysts were prepared by coprecipitation method and used for treating the Acid Red B wastewater with catalytic wet air oxidation method.
So clarifying the effect of catalyst preparation conditions on the catalyst physical properties as well as its catalytic performance has important theoretical and practical significance for the catalyst research and development.
The order of addition of precipitating agent has a great impact on the properties of the catalyst.
The effect of reaction temperature on the particle diameter of the product is remarkable, in the precipitation process, the size of the particles was mainly decided by the rate of nucleation and its growth rate, and the latter is more easily affected by the reaction temperature.
As an other important factor, the calcination temperature can impact on the catalyst activity, stability and mechanical strength.
Online since: December 2010
Authors: Jing Liang He, He Yuan Dong, Xiao Yan Ye, Xue Jun Wang
Excessive large tension can make cutting line break; while excessive small can cause additional low frequency vibration of cutting line and insufficient carrying capacity, so as to affect the workpiece’s surface processing quality.
In the winding process, the biggest factor of tension change is due to the increasing diameter of wrap wheel.
Fig.3 Torque speed characteristic curve of generally motor and torque motor Curve Two Curve One 1 2 3 In fig.3, curve1 stands for the mechanical characteristic of general motor, and curve 2 stands for the mechanical characteristic of torque motor.
In fig.3, is synchronous speed, is Stall torque, is general motor’s speed at maximum torque, and also the sub-boundaries of the mechanical properties of the “stable part” and “unstable part”.
From fig.3, we know that mechanical characteristic of the torque motor is very soft.
Online since: May 2011
Authors: Tammam Merhej, De Cheng Feng
Fibers have the effect of improving some of the material properties of concrete such as compressive and flexural toughness, fatigue resistance and impact resistance [1, 2, and 3].
The fibers enhance the concrete properties by improving its effectiveness in inhibiting the rapid and unlimited propagation of cracks, associated with catastrophic failure in plain concrete.
Synthetic fibers; such as polypropylene fibers; have some unique properties that make them excellent candidates to be used in concrete.
The geometrical and mechanical properties of fiber used in this study are presented in table 2.
Geometrical and mechanical properties of fibers shape Length (mm) Aspect ratio Specific gravity Tensile strength (MPa) Elastic modulus (GPa) Twisted 60 120 0.91 379 4.14 Mixtures.
Online since: February 2011
Authors: Mohammad Reza Eslami, Gholam Hassan Payganeh, Behnam Davoodi
Hence, the predictability of any metal cutting model largely depends on the accuracy of the constitutive model for the work material properties.[4] Merchant [5] and others [6–9] assumed that the shear flow stress is equal to that obtained from the conventional tensile tests.
The SHPB method is useful to evaluate the effect of individual factor such as strain, strain rate or temperature on the flow stress.
So the influence of thermal softening and strain hardening on sample properties could be ignored.
Metal cutting tests provide some advantages over the SHPB method and other independent material tests to estimate the material properties in cutting conditions.
Liu, Mechanical properties of hardened AISI 52100 steel in hard machining processes, J.
Online since: January 2012
Authors: Huai Feng Tong
Therefore, in this paper to optimize the design of treatment options, based on two factors of consolidation degree and bearing capacity, but also refer to the following values problem of the design parameters derived from the engineering experience: ① The choice of pile diameter Small non-sand concrete pile diameter is generally used in 150~450 mm, in the choice of pile diameter, according to the geological and holling conditions, equipment conditions, etc. are often used in 250 ~350mm. ② The length of pile The values of pile length relate to engineering geological properties of the soil and building requirements of the settlement, and the size of the required capacity of single pile etc. pile generally should be located on the soil that has higher bearing capacity, length-diameter ratio greater than 20, but should not exceed 80; Common length- diameter ratio is normally 40 to 60. ③ The value of mobilization factorof single pile bearing capacity The size ofrelate to building requirements
of the settlement, the engineering less demanding on building settlement, the value of factor may take 1.4 to 1.6, otherwise take 1.2 to 1.4. ④The value of enhancement factor of bearing capacity of natural soil The size ofrelate to properties of the natural soil between piles, building requirements of the settlement, the size of area replacement ratio.
For the factor of well diameter ratio: , is the well diameter ratio, the relationship betweenandshown as following table 2.
For small non-sand concrete pile, because the pile diameter affected by the engineering geological conditions and drilling equipment, the scope of common values of pile diameter changes in lesser extent, can be considered as a constant, in this case, the trends of,andis consistent.
For the factor of smear and disturbance: , the impact on the ground consolidation mainly related to the factors of construction, but no direct relationship with the size of the pile spacing.
Online since: July 2015
Authors: Ruey Yi Lee, Chang Wei Lu, Hung Hsiang Lin, Szu Han Wu, Yung Neng Cheng, Wen Hsiu Chung, Jing Kai Lin
The results reveal that, the operating temperature is the most crucial factor to the stack performance.
The relatively larger slope of S/N ratio caused by levels represents the more important of factor and higher S/N ratio expresses the better level.
Therefore, the results of plots indicate the operating temperature is the most critical to the power output and the anode flow rate is the major factor to the electrical efficiency.
The results reveal the operating temperature remarkably affects the power performance.
Liu, High-temperature mechanical properties of a glass sealant for solid oxide fuel cell, J.
Online since: June 2008
Authors: Bo Qin Gu, Ye Chen, D.S. Zhu
The temperature-dependent tensile strength is an important indicator used to evaluate combination property of short-fiber-reinforced elastomer matrix composite.
The temperature-dependent tensile strength is an important indicator used to evaluate combination property of this kind of sealing composite [1].
The tensile strength of fibrous composites and its influencing factors were widely investigated at normal temperature [2]-[10].
The thermal stress in SFRE is induced by the variation of temperature because of the difference in the properties of the fiber and matrix.
The temperature induces the thermal stresses in the fiber, matrix and fiber-matrix interface, which affect the temperature-dependent tensile strength of the composite finally.
Online since: March 2021
Authors: Joshua Nathaniel B. Padrigo, Gerald Mari O. Quiachon, Christian Matthew P. Mabborang, Persia Ada N. de Yro
Possessing a high carbon yield of 50% and its CNF exhibit excellent mechanical properties [3].
Polycaprolactone (PCL) is known to be easily electrospun because of its excellent mechanical properties and its semi-crystalline polymer property, which enables to be easily formed at low temperatures [4].
Factors such as optimization of concentration for CQD–PAN/PCL nanofiber mat should be considered for further improvement of the study.
“Synthesis and Properties of Photoluminescent Carbon Quantum Dot/Polyacrylonitrile Composite Nanofibers”, Smart Science, 1-8, 2017 [8] M.
“A Mini Review on Carbon Quantum Dots: Preparation, Properties, and Electrocatalytic Application”, Frontiers in Chemistry, Vol. 7, No. 671, 1–9, 2019 [13] D.L.
Online since: October 2012
Authors: Cui'e Wen, William Song, Syed H. Riza, Syed H. Masood
Emphasis is on the use of bio-compatible metals, because metals are the most suitable materials in terms of mechanical strength when the requirement arises for supporting and replacing the load bearing bones and joints such as hip and knee.
Therefore, DMD offers building up of complex metallic structures with controlled material, micro-structural and mechanical properties directly through CAD models, without additional tooling [7].
It is possible in a DMD process to generate structures with controlled properties at micro and macro levels without significant heat treatment since the laser creates a very small heat affected zone.
Glassman, Porous Coated Hip Replacement - the Factors Governing Bone Ingrowth, Stress Shielding, and Clinical Results, The Journal of Bone and Joint Surgery 69-B (1987) 45-55
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