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Online since: February 2011
Authors: Jing Wen Wang, Zong Yin Duan, Jin Biao Zhang
However, there is a key factor that need to be taken into cosideration, such as diehole lacation on the multi-hole die.
The optimal die design for such process is to achieve both uniform flow distribution on the outlet cross-section of flow channel and small barus effect on the extrudate so as to ensure the requirements on the extrinsic feature, mechanical property, and dimensional precision of the final products[4].
According to factory experience, the hole diameter dp and the locating circle diameter dc, are two important factors that significantly affect both the forging force and the flow distribution uniform.Therefore, they are selected as two variables for the multi-hole die strcture design.Conversely, the others are considered as constants to reduce the space of optimization algorithm, despite they fairly influence the final extrsion quality.
The deformation load is another important factor contributing to the performance and economics (efficiency and quality) of extrusion forming process.
Wang: China Mechanical Engineering Vol.21 (2010), p.1338
Online since: August 2016
Authors: Florică Tudose, Mihai Ovidiu Cojocaru, Mihaela Raluca Condruz
The variation of those properties was determinate following the influence of the reinforcement percentage.
Significant changes of thermophysical properties weren’t noticed at temperatures limits between 20÷600°C and different proportion of reinforcement, though the properties are lower compared to the unreinforced matrix.
Fig.6 The influence of alumina proportion and temperature on the thermal diffusivity Conclusion In the present work it was observed that grading fraction, fraction ratio and reinforcement proportion of Al-Al2O3 mixtures used are the principal causes that alter the level of technological properties, properties that affect the compression capacity of mixtures.
The nature and the quantity of the lubricant are factors that influence the densification of the samples after sintering.
„Aluminium Alloys: Structure and Properties” Butterworth&Co (Publishers) Ltd, 1976 [7] Cojocaru M „Metal powders.
Online since: January 2012
Authors: Anil Kumar Jain, A.V. Alias, Abhay Kumar Jha, Parameshwar Prasad Sinha
Owing to high carbon content, the mechanical strength and corrosion resistance of martensitic stainless steels are usually better in annealed state and further improve by hardening with solid-state phase transformation.
Case depth, micro hardness, geometry of heat-affected zone, microstructure, mechanical (strength, toughness or fatigue) and wear resistance largely depend in laser process parameters.
Along directional overlap factor Qf is calculated as Qf= [1-(V/f)/(S+VT)] [4] Where Vis process speed (scan rate in mm/sec), f is laser frequency in Hz, T is pulse duration in second, and S refers laser spot diameter to specimen in mm.
In the present study efforts has been made to maintain high overlapping factor for sample LTH1, LTH2 i.e. 93.2%, 93.7% by proper selection of above parameter.
Because of high degree of overlapping, it seems that laser treated area has uniform physical properties throughout the laser feed direction.
Online since: June 2015
Authors: V.O. Vasylechko, Ch.B. Korpalo, G.V. Gryshchouk
The sorption properties of acid-modified Transcarpathian clinoptilolite towards Sc(III) under dynamic conditions have been studied.
H-forms of zeolites differ a lot from non-modified zeolites in terms of their sorption properties.
The sorption properties of acid-modified clinoptilolite were studied under dynamic conditions in solid phase extraction mod.
Sorption properties of Transcarpathian clinoptilolite also depend on the thermal pretreatment [6,9].
The properties of the NH4-clinoptilolite.
Online since: October 2009
Authors: Shigeru Suzuki, Takamichi Yamamoto, Tomoya Uruga, Hajime Tanida, Hidenori Toyokawa, Yasuko Terada, Yasufumi Takagaki, Kozo Shinoda
Alloying elements are added to steel for improving surface properties such as corrosion resistance.
Introduction Alloying elements such as Si, Mn and Cr are added to steel products to improve their mechanical and surface properties.
Although manganese is often added to steel for controlling not only the mechanical properties but also surface properties, manganese is formed as manganese oxide in the surface layer by annealing at high temperatures [1,2].
The decrease in the density and compositional distribution in the surface layer are considered as important factors to investigate the distribution of density, composition and phase in surface area for understanding the mechanism of enrichment and oxidation of manganese.
Hesselmann, Thermochemical Properties of Inorganic Substances, 2nd ed., Verlag Stahleisen (1991)
Online since: October 2006
Authors: Magdalena Palacz, Matthew P. Cartmell, Irina Trendafilova, Wiesław M. Ostachowicz, Marek Krawczuk, Emil Manoach
There are lots of factors that frequently cause damage on aircraft wings and wing panels, which often remains invisible on the surface.
Present design of aircrafts uses large safety factors to account for possible damage, which leads to cost and weight increase.
Vibration-based methods are based on the fact that the introduction of damage in a structure changes its physical properties which in turn leads to changes in its vibration response.
This stage normally contains transformations that have some clustering properties and can reduce the dimensionality of the initial data vectors.
Van Overmeire: Mechanical Systems and Signal Processing, vol. 16(4), (2002), p.637
Online since: June 2017
Authors: A.G. Barbosa de Lima, M.K. Teixeira de Brito, D.B. Teixeira de Almeida, L. Almeida Rocha, E. Santana de Lima, V.A. Barbosa de Oliveira
A transient three-dimensional mathematical model based on the Fick´s and Fourier´s Laws was developed to predict heat and mass transport in solids considering constant physical properties and convective boundary conditions at the surface of the solid.
Therefore, the attempt to control the properties of the product must pass through the understanding and controlling of the basic properties of the materials which are directly related to the manufacturing process.
During the drying process of a ceramic part, due to various operational factors such as temperature, relative humidity and of the velocity drying air velocity, shape and thickness of the piece, several failures in the product can occur, such as cracks, warping, florescence and black heart leading to its loss and causing economic and environmental damage to the ceramic industries.
[°C] 2R1 [mm] 2R2 [mm] 2R3 [mm] t [min] 80 5.0 0.1 2.71 9.02 27.94 60.26 6.55 20.56 270 Table 2 - Transport properties used in the simulations.
Beasley, Theory and design for mechanical measurement, second ed., John Wiley and Son, New York, 1995
Online since: January 2017
Authors: Li Min Wang, Hai Jing Yang, Zhen Ping Sun, Liang Liang Shui, Wen Xian Zhu, Xu Yang
For granular agent, a proper physical dimension and a good mechanical property are the most important factors.
Thus, elasticity and plasticity are the most important factors of fibroid agent and sheet agent.
PCC temporary plugging agent, it’s mechanism and affect factors.
In order to maintain its superior performances, various factors must be taken into consideration from processing to application.
Synthesis and properties of superabsorbent resin used as the plugging agent in petroleum drilling, J.
Online since: March 2010
Authors: Bang Yan Ye, Jian Ping Liu, C.L. Wu, X.L. Liu, R.T. Peng, X.Z. Zhao
In many industrial application case, machined surface state of precise or burden part affects directly on its fatigue life, chemical corrosion resistance and abrasion capability.
In hard cutting process, elastic-plastic deformation of workpiece material often occurs in the case of high temperature and large strain rate, therefore, how to effectively describe material properties is one of the key for Finite Element simulation.
The second and third factor express the strain-rate effect and temperature effect respectively.
The machinery physical properties of workpiece materials 42CrMo steel and Johnson-Cook material model parameters [6] is shown in Table 1 and Table 2 respectively.
Table 1 Physical properties of 42CrMo (HRC56) Mass density (kg·m -3) 7830 Young's modulus (GPa) 210 Poisson ration 0.3 Thermal conduct (w·m -1·℃-1) 46 Specific heat (J·kg -1·℃-1) 500 Thermal expansion (µm·℃-1) 12.3 Table 2 J-C behavior parameter of 42CrMo 595 D1 1.5 B(MPa) 580 D2 3.44 n 0.133 D3 -2.12 C 0.023 D4 0.002 m 1.03 D5 0.1 Tool-chip Contact and Friction State in Cutting Process.
Online since: July 2015
Authors: J. Jayaprakash, K. Rajan, N. Manikanda Prabu, S. Nallusamy
Educational and Research Institute University, Chennai, 600095, Tamilnadu, India 2Department of Mechanical Engineering, Nehru Institute of Engineering and Technology, Coimbatore, 642105, Tamilnadu, India 3, 4 Department of Mechanical Engineering, Dr.
In bionic technology, the linkage mechanism is important primarily in mechanical structure design.
Simple control options, convenience in carrying sensors and overall costs are the other primary factors.
We may consider the two important factors such that, they are in danger of a collision or have to face permanent problems like wheel-slip or abrasion.
This research study may be extended by considering more number of success factors that are affecting the design of robot and its implementations.
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