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Online since: June 2012
Authors: Ji Ming Xiao, Quan Dai Wang, Yan Jun Lü
After analyzing the factors that influence the current density distribution on the anode surface in EMM process, three potentially feasible schemes are presented and their fabrication results are predicted through numerical simulation.
Recent research has shown that the presence of artificially created microstructures (namely surface texturing) can significantly affect friction and wear behavior of lubricated surfaces[2].
However, with the scheme1, only microstructures in non-uniform distribution can be produced, which will result in different friction property in different areas.
The uniform property is generally required, thus in this work, the fabrication scheme2 is adopted.
Spikes: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, Vol. 217(1)(2003), p1
Online since: November 2012
Authors: Wei Ping Tian, Jia Chun Li, Peng Li Li
Landslide many kinds of, wide distribution , great harm, It threats people's lives and properties, and blocks the economic development there.
It is mainly through the engineering geology survey, according the main factors of influence landslide stability, analysis the possible way of deformation and instability of mechanical mechanism, can qualitative explain was given evaluation landslide stability situation and the development trend.
Its advantage is synthetically considered the influence factors of landslide stability, make fast evaluation of landslide stability state and development trend.
By data analysis, six factors are chosen as the input: average slope, slope of the invading front, sliding surface slope, the maximum daily rainfall, the recent slide situation, human engineering activities.
By input he influence factors of landslide stability analysis as the network input values, according to output results to analyze the stability of the landslide.
Online since: January 2012
Authors: Qing Long An, Ming Chen, Zhi Qiang Liu, Ying Ying Wei
Study on the Machinability of Free-cutting Steels 1214 and 12L15 With Coated Tool Y.Y.Wei1, a, Z.Q.Liu1, b, Q.L.An1, c, M.Chen1, d School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, P.R.
The ratio between Mn and S is one of the essential factors which may affect free-cutting ability.
Surface roughness is of great importance because it is used as the critical quality indicator for the machined surfaces and has influence on several properties such as wear resistance, fatigue strength, coefficient of friction, lubrication, wear rate and corrosion resistance of the machined parts[3].
From the view of cutting force, material 1215 leads to a slightly small cutting force comparing with material 12L14.The ratio between Mn and S is an essential factors.
Zhang et al.: Chinese Journal of Mechanical Engineering, Vol.43 (2007) No.9, p.162-163(In Chinese)
Online since: January 2014
Authors: Lucjan Witek
If a problem arises in the compressor section it will significantly affect the whole engine function and, of course, safety of the aircraft.
b) Effective value of stress intensity factor (Keff).
Figures 4a-4c present values of stress intensity factors KI, KII, KIII (computed for increment no. 3) in function of curvilinear S coordinate (position along crack front).
Effective stress intensity factor (Keff) presented in Fig. 4d was calculated from Yaoming equation [11]: (1) The equation (1) gives a relationship between the individual stress intensity factors and the Keff value, however we need to compute ΔKeff.
The compressor blade of PZL-10W turbo-engine (Fig. 1a) was made out of EI-961 steel (0.11C, 11Cr, 1.5Ni, 1.6 W, 0.18V, 0.35Mo, 0.025S, 0.03P) with the following properties (in 20OC) after heat treatment: Ultimate tensile strength 900-1090 MPa, Yield stress 800-900 MPa, Young modulus 200 GPa, Poisson ratio 0.3 [12].
Online since: April 2014
Authors: Xia Qing Zhu
The resistance strain gauge is a key component of dynamic weighing system, but because of the resistance strain gauge temperature properties and long-term stability and so on some technical indicators can not meet the high accuracy of performance requirements for weighing sensor.
Variable, nonlinear and the random interference factors are contained in dynamic weighing process.
When the weighing speed is accelerated, vibration caused by the material impact and uncertainty of material in the air will affect the weighing precision, so in order to improve the weighing accuracy, sometimes it will have to lower the weighing speed.
There are many uncertain factors weighing process, such as mechanical parts have inertia characteristics, the weighing signal has a lag and the falling material has an impact on the scale body etc.
Because the instability caused by the incoming flow of the material and the pure lag from the mechanical inertia, it is very difficult to improve the control precision.
Online since: March 2008
Authors: Dun Wen Zuo, Min Wang, Hun Guo, Guo Xing Tang, Yang Jing Guo
Analysis of Optimal Clamping Schemes for Aero-Multi-Frame Monolithic Components Hun Guo 1,2,a, Dunwen Zuo 1, Guoxing Tang 2, Min Wang 1 and Yangjing Guo3 1 College of Mechanical & Electrical Engineering, Nanjing University of Aero & Astron, Nanjing, China, 210016 2 School of Mechanical & Electrical Engineering, Changzhou Institute of Technology, Changzhou, China, 213002 3 Beijing Huayuanyitong Heating Supply Technology Development Co., Ltd.
Many researchers emphasize on investigating how clamping points, clamping order, and clamping force affect in-process dimensional precision and setting accuracy [5-8].
But they only focus on single factor, the combined factor of clamping force and milling force has been not considered.
The geometric dimension, its property value and the working parameters are listed in Table 1.
This study conclusion has been validated by the actual production. 3) But in this study other factors except for clamping force have been not considered, so this model need to still perfect further so that it is the purpose of this publication to address those specific needs of studying workpiece fatigue resistance in next study.
Online since: January 2005
Authors: Anjali A. Athawale, Malini Bapat
Introduction : BaZrO3, a refractory ceramic has good mechanical strength and chemical stability with a small coefficient of thermal expansion.
Newer methods are thus being tailored to produce nanocrystalline ceramics having sinterability at lower temperatures, phase homogeneity, fine particle size, unique magnetic, electrical, mechanical and optical properties.
From the experiments, it appears that a number of factors affect the variation in the reaction product formation, predominantly heat evolved, maximum reaction temperature, local O2 and CO2 concentration, redox reactions and heats of formation and decomposition of reactants and products.
Further investigating studies are required to co-relate these factors and predict course of reaction.
Online since: February 2012
Authors: Qing Hai Wang, Lin Na Zhang, Peng Zheng, Feng Xia Zhao
Uncertainty Evaluation of SEM-based Nanoroughness Measurement Fengxia Zhao 1, a, Qinghai Wang 2,b, Linna Zhang 1,c and Peng Zheng 1,d 1 School of Mechanical Engineering, Zhengzhou University, Zhengzhou, P.
China, 450001 2 Henan Mechanical and Electrical Vocational College, Zhengzhou, P.
The SEM first focuses an electron beam whose cross-sectional radius is very small (5-7nm) and then scans a sample in a raster way, producing information which is related to the properties of the sample.
Because an SEM image is formed from the interaction of incident electrons and a sample material, there are several factors, such as the wave character of incident electrons, magnification, scanning speed and resolution, etc, which contribute to uncertainties in the precision of nanoroughness measurements.
Suppose every two uncertainty factors above mentioned are non-correlated, then according to uncertainty combination equation presented in ISO GUM [6] the total uncertainty of SEM-based nanoroughness metrology can be derived from (1) Where is the uncertainty of extraction operation, is the uncertainty of filtration operation and is the uncertainty of fit operation.
Online since: August 2011
Authors: Chun Fu Gao, Zhi Yong Luo, Bing Wang, Xin Sheng He
In addition, SRI has developed the Rolls robot by using bending actuator with multifunctional dielectric elastomer, which used the single, flexible bending actuator instead of mechanical joint, shown in Fig. 1(b).
Based on the advantages of dielectric bending elastomer actuator, the bending elastomer actuator is designed and its property is tested and analyzed by experiments to provide instruction for the research of this type actuator.
Fig.3 Working principle of bending actuator Fig.4 Sketch of the coiling process of the bending actuator a) Before switch-on b) After switch-off Fig.5 Real object of the bending actuator Experiment and Analysis The principle factors which affect the performance of the bending actuator include the parameters of compressed spring (such as diameter of spring wire d, diameter of spring D), the prestretching rate of dielectric elastomer film , the precompression of spring and so on.
The prestretching rate of dielectric elastomer film and the voltage difference between the electrodes are the factors for consideration.
So the characteristics of electromechanical coupling and mechanics need to be studied in depth to improve the property of the actuator.
Online since: August 2019
Authors: Soumya Sourav Sarangi, Avala Lavakumar
The use of XRD enables the operator to study different properties in a larger specimen surface area, which can be assumed to give a representative data.
The properties of steels are direct function of their microstructures.
The carbon concentration of steels affects the physical, chemical and mechanical properties to a large extent.
The degree of fitting of the refinement results were evaluated by minimizing weighted – profile R- factors (Rwp) and Rietveld standard deviations of the structural parameter (χ2) [3].
Significant amount of strain may be introduced during the sample preparation stage, which involved only mechanical grinding and polishing.
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