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Online since: June 2009
Authors: John Blackburn
The final volume will be dependent on a number of factors including the deposit thickness, the target deposition times and the optimum number of deposits from a suspension batch.
In each of these applications the ceramics must have a tightly controlled chemical composition and be free of contamination which would adversely affect their conductivity.
EPD pilot plant for ceramic tubes Material Properties.
Proof-of-concept rig for EPD of coatings on flat foils Material Properties.
In NiO/ZrO2 cermet layers the NiO, following reduction to Ni on firing, provides the conductive element within the SOFC anode and the ZrO2 provides mechanical stability, compatible thermal expansion and helps to maintain the required porosity.
Online since: December 2012
Authors: Yuan Lin Ren, Xian Lin Xu, Xiao Yang Sui, Li Na Wang
Introduction Polyester-cotton blended (PCB) fabric is an excellent material with outstanding mechanical, good moisture absorption and dying easily characteristics.
Several flame retardant techniques have been exploited for improving the fire performance of PCB fabric: flame retardant finishing has been used for improving the flame retardancy of PCB fabric because of its convenience and cheapness during processing[2-7], but the flame retardant is not durable after treatment finishing. modification of some filaments could improve their flame retardant properties, some fabrics are considered to be permanently fire retardant[8-12]. however, the combustion characteristics of blended fabric cannot be predicted, the two fibers can occur physical and chemical reaction during the process of thermal degradation, the process is complicated and changeable; flame retardant coatings, as one of efficient ways, have been employed widely to protect a substrate against fire[13-18], it can avoid the heat penetrating and flames spreading[19, 20], but the fabric feel harden after treatment.
The key factors which affect the grafting polymerization, for example, the concentrations of monomer, the time of grafting and the temperature of the reaction have been studied.
Flame Retardant Properties.
Online since: September 2007
Authors: Franz Faupel, Klaus Rätzke, V. Zöllmer, A. Bartsch, Andreas Meyer
During the first annealing, these systems undergo structural changes, sometimes termed structural relaxation, where many properties change, e.g., the density increases, the diffusivity decreases and short range order sets in.
Due to the amorphous structure conventional lattice defects like vacancies or dislocations are missing, which leads to several new and interesting properties.
This excellent agreement shows that the present experiments are not affected by convection, in contrast to many previous experiments in metallic melts [11].
Comparing in Fig. 4 the 57 Co diffusivities of this work in the undercooled melt to the ones previously measured in our laboratory, one can see a difference of a factor of two [22, 29].
But this has no influence on our results because the difference of a factor of two is quite small in comparison to the orders of magnitude effects we want to investigate.
Online since: November 2011
Authors: Meng Lan Duan, Ming Jie Li, Fang Fang Yu, Hong Huan Zhang, Xiao Yao Ren, Cai Xia Li
A hybrid model test is carried out and corresponding numerical simulations conducted to verify the function and mechanical properties of the designed J-lay system. 2 Structure design of the J-lay system The J-lay system is complex in structure.
The allowable stress of the structure is about 230Mpa taken 1.5 as safety factor according to the design manual of subsea structure.
Communicating with TwinCAT software PLC via OPC, MCGS realizes real time data acquisition and display and control of pipe-laying operations strictly according to the workflow. 4 Model testing system In order to verify the function and mechanical properties of the J-lay system, a model (including tower adjuster subsystem, pipe loader, travelling clamps, ELUT and framework of the tower) is developed.
Although the EMI and coating error will affect the test results, the comparison between results from Abaqus and test shows that the difference is less than 10%.
Online since: July 2003
Authors: M.S. Williams, P.D. McFadden, S.A. Neild
McFadden 3 1 University of Bristol, Department of Mechanical Engineering, Queen’s Building, University Walk, Bristol BS8 1TR, UK. simon.neild@bristol.ac.uk 2 University of Oxford, Department of Engineering Science, Parks Road, Oxford OX1 3PJ, UK. martin.williams@eng.ox.ac.uk 3 University of Oxford, Department of Engineering Science, Parks Road, Oxford OX1 3PJ, UK. peter.mcfadden@eng.ox.ac.uk Keywords: Sensors and measurement strategies; strain gauges; hysteresis measurements.
It is vital that the pick-up does not move between tests as its position will affect the natural frequency of the wire – this effect will be cancelled out so long as the position is exactly the same in all tests, including the initial zero reading.
The results show a high degree of linearity and give a gauge factor of G = 1.259 × 109 s 2.
In what follows, different damage levels are denoted by Dn where n is the number of 1500 N increments. 0 10 20 30 40 50 60 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 x 10 4 applied strain (x10 −6 ) predicted strain / gauge factor data points line fit Figure 3.
It can be seen that there is a slight increase in the non-linear stiffness properties of the beam with damage level, with the exception of the highest damage level, D10, where there is a flattening of the hysteresis loop on its lower side.
Online since: July 2011
Authors: Jia Lin Tian, Zheng Liang, Lin Yang, Lian Cheng Ren, Xue Qing Mei, Bai Chuan Xiao, Lan Lan
Tianjin, 300451, china a tianjialin@swpu.edu.cn, b liangz_2242@126.com, c ylin@swpu.edu.cn, d rlcgp1999@yahoo.com.cn, e xqmei3@sina.com About the author: Corresponding author: Jialin Tian: Assistant Professor of the Department of Mechanical Engineering at Southwest Petroleum University.
To obtain accurate flow field properties of the compressible viscous turbulent flow of natural gas downhole choke, this article research on flow field with numerical calculation and simulation method.
It omitted partial structures which did no affect the downhole choke internal flow field, such as external structure components, chamfer, fastener and sand-against cover.
It embeds the influencing factors and simplifies the geometric model, and this can optimize the downhole choke diameter data without changing other parts parameter.
The phenomenon of high pressure outflow is complex, the key factor of making the numerical calculation and simulation of outflow of downhole choke is using the effective turbulent flow model.
Online since: December 2012
Authors: Cheng Tung Chong, Simone Hochgreb
Flow Field of a Model Gas Turbine Swirl Burner Cheng Tung Chong1, a, Simone Hochgreb2,b 1 Faculty of Mechanical Engineering, Universiti Teknologi Malaysia 81310 Skudai, Johor, Malaysia. 2 Hopkinson Lab, Department of Engineering, University of Cambridge, Trumpington Street, CB2 1PZ Cambridge, UK actchong@mail.fkm.utm.my, bsh372@cam.ac.uk Keywords: swirl flame, flow field, gas turbine, palm biodiesel, PIV Abstract: The flow field of a lab-scale model gas turbine swirl burner was characterised using particle imaging velocimetry (PIV) at atmospheric condition.
Swirl is commonly employed for enhancing flame stability in burners; the effect of swirl addition on various factors has been studied, including spray evaporation rates [2-4], flame stabilization [5] and flame-droplet-flow interactions [6].
Owen et al. [7] reported that the variation of inlet swirling air can change the interaction between the spray and the air stream and subsequently affect the fuel evaporation and fuel-air mixing rates.
The fuel physical properties of diesel and PME can be found in [11].
The spray flow shows higher radial velocity magnitude than the non-spray flow by a factor of 3 at z = 10 mm from burner exit as shown in Fig. 3b.
Online since: October 2008
Authors: Y.H. Chai, Y.T. Chen, H.J. Hung, G.N Rocha
Factors contributing to the unsatisfactory performance include (i) time-dependent consolidation of the natural soil under the embankment and/or fill material due to inadequate compaction, (ii) poor drainage behind the bridge abutment, which results in the erosion of the fill material causing void formation under the approach slab, (iii) longitudinal and vertical movements as well as rotation of the abutment causing localized damage at the connection of the approach slab.
Physical and mechanical properties of the I-bars, cross-rods and vertical connectors follow that given in [7], where the longitudinal tensile strength and tensile modulus of the I-bars and cross-rods were reported to be 80 and 95 ksi, and 4500 and 5500 ksi, respectively.
The increase in rebar size or closer spacing is a result of the use of the relatively small capacity reduction factor ( 65.0=φ for concrete crushing and bar fracture) for FRP reinforcement design, as prescribed in the guideline [8].
The significant reduction in stiffness after the 6 ft washout, which will affect the serviceability of the slab, can be attributed to the loss of direct soil support under the middle axle.
Online since: November 2010
Authors: Pei Xin Zhang, Xiang Zhong Ren, Dong Yun Zhang, Zhen Zhen Fan, Li Zhang, Kun Liu
The structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were analisised by employing X-ray diffraction(XRD), scanning electron microscopy(SEM) and galvanotactic charge-discharge test.
Liquid chemical can be prepared cathode material with excellent properties, but it requires a lot of solvents and high cost of raw materials.
In this paper, to improve the electrochemical properties of the starting material, we first use chemical activation mechanical milling the raw materials, a variety of materials to achieve high uniformity of mixing and surface activation, increase the reactivity of the precursor to study the mechanochemical activation of solid phase preparation of precursor and the lithium-ion battery cathode material LiNi1/3Co1/3Mn1/3O2 process.
Results and discussion Effect of Milling methods on morphology and properties of precursor materials.
When the lithium excess, they will destroy the layered structure and deteriorate of the electrochemical properties, thus the best ratio for N is suggested to be 1.1.
Online since: June 2022
Authors: Marilés Bonet-Aracil, Eva Bou-Belda, Edgar Marcelino-Perez, Ana Amat Payá, Antonio Arques Sanz, Rafael Vicente
Some properties like durability, good stability to degradation, lightweight, and low cost make them an idoneous material.
It is reported that more than a half of plastics waste ends up on the environment and thus, making the soil and water two of the most affected environments by these pollutants [2].
As well as photo-Fenton degradation showed that the irradiation using a solar simulator promotes a better degradation of the PA6.6 microplastics than with the use of natural solar irradiation which become the irradiation intensity one of the principal factors that influence the process under the experimental conditions tested.
Velasco-Santos, Effects on the thermo-mechanical and crystallinity properties of nylon 6,6 electrospun fibres reinforced with one dimensional (1D) and two dimensional (2D) carbon, Materials (Basel). 6 (2013) 3494–3513
Yu, Transient Confinement of the Quaternary Tetramethylammonium Tetrafluoroborate Salt in Nylon 6 , 6 Fibres : Structural Developments for High Performance Properties, Materials, 14 (2021) 2938
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