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Online since: April 2013
Authors: Javier Taboada Castro, Jose Antonio Vilán Vilán, Nuria Sánchez Delgado, Maria Araújo Fernández
The yield for any natural stone cutting process is affected by a number of factors specific to the cutting system (tools, abrasives and coolants, and also factors such as peripheral disk speed, advance speed, depth, vibration, etc.) and the characteristics of the rock itself, whether physical-mechanical (hardness, compressive strength, tensile strength, abrasivity) or petrographic (mainly mineralogy, texture and void spaces).
A detailed review of the influence of factors specific to the cutting system (characteristics of the diamond tools, disk, regime and cutting speed, lubricants, etc.) and the main contributions of various researchers in this field can be found in [1].
The main objective of this phase of the project was to determine the optimal cutting parameters for each of the granite varieties studied (see [9] for a study of the principles of rock cutting technology using diamond tools and the different influencing factors).
The remaining parameters affecting the cut (disc diameter, rotation speed and coolant flow) were set at appropriate constant values.
Note that, in view of the great diversity of marketable granites, and given the not always direct correlation between physical and petrographic properties and behaviour in response to cutting, our findings cannot be generalized beyond the seven varieties described in this article.
Online since: August 2008
Authors: Ming Zhou, Lan Cai, Jia Hong Yang, Xia Ye, Ao Ran Zheng, Gang Li, Pei Fang Yang, Yi Zhu
Experimental data presented in this paper indicate that different surface roughness and wettability are the important factors for blood platelet adhesion.
Various studies have shown that the interfacial interactions are related to surface properties such as surface chemical composition, surface wettability and surface roughness[7-9].
Blood platelet adhesion test was carried out to estimate blood compatibility, with a view to the influential factors of surface roughness and wettabililty.
The disfigurement is primarily resulted from that PDMS did not penetrate into silicon mold, which was related to factors of degassing time, mold cleanness and curing temperature.
They react with artificial surface, aggregate together and release coagulation factors.
Online since: August 2014
Authors: Yu An He, Yan Ming He
Introduction Processing property of high speed CNC machine is directly determined by the performance of motorized spindle.
Quanying Lu et al.[4] presented all kinds of factors, which gave rise to motorized spindle failure, taken measures for improvement.
The traditional mechanical transmission mode is changed by motorized spindle.
In addition other factors can cause spindle vibration, for example, spindle assembly, bearing accuracy, concentricity of the stator and the rotor, uneven air gap of the stator and the rotor, and so on.
The factors which can cause the motorized spindle failure are also analyzed.
Online since: July 2011
Authors: Feng Jiao, Bo Zhao
American scholar Bifano built a critical grinding depth model of engineering ceramics by means of micro-indentation method, and he believed that the main influencing factor of the critical depth is the physical and mechanical property of the material[1].
Research literatures show that the brittle-ductile transition of material removal is not only related to material properties, but also to the processing method and conditions.
Test conditions are shown in Table 1 and material properties of nano-ZrO2 ceramic are shown in Table 2.
Synthesizing the above two factors, both tangential force and normal force will decrease after the assisted ultrasonic vibration is added in longitudinal dircetion.
Influence of Ultrasonic Excitation on Material Mechanics Properties.
Online since: June 2014
Authors: Marion Merklein, Stephan Tremmel, Ulf Engel, Tobias Schrader, Martin Weschta, Sandro Wartzack
The mechanical properties of the cross-section of specimens are determined by Vickers hardness to approve the material flow.
Normally, mechanical tappets can rotate within its guidance.
The friction factors for extrusion punch and die mp = md were set to 0.15 for the basic model.
Fig. 6: Influence of friction factor on cup heights.
On contrary, the accuracy of microstructures is affected by the extrusion process.
Online since: May 2020
Authors: A.R. Maskova, G.U. Yarmuhametova, Yu.N. Savicheva
About Communication of the Comparative Properties Plasticized PVC Compositions and Quantities of Additives Used A.R.
These indexes significantly affect a number of physicomechanical properties of composition on the basis of PVC.
The hardness of the above-stated composition is higher, the wear resistance of products on its basis and other mechanical characteristics of a surface is better.
Replacement of DOF by DOOEF was made taking into account the factor of replacement defined earlier [20-26].
Parameters of multifactorial regression model Properties Model parameters Rated coefficient of correlation R2 Calculated value of criterion of Fischer Fcalc Tabular value of criterion of Fischer *Ftab Standard mistake Shore A hardness 1,7025 -5,1067 -0,2774 0,75 1038,85 19,16 2,54 MFR 0,6036 0,9482 0,1366 0,75 4347,44 0,90 * at a significance level 0,05 According to these tab. 2, the rated coefficient of correlation R2 more than 0.7 that testifies to close connection between the studied factors (content of additives) and the end result (physicomechanical properties).
Online since: August 2011
Authors: Feng Yun Yu
So the spontaneous magnetization of samples is affected by the tensile loads.
Main factors affecting magnetic field intensity.
The permeability and magnetization of materials is affected by their carbon and alloy contents.
The carbon content of 16Mn steel is lower than 0.2%, and the addition of Mn influences its magnetic property and interferes with the relation between carbon and magnetic property.
Zhou: Chinese Journal of Mechanical Engineering, Vol. 46 (2010), p. 15 (In Chinese) [3] F.Y.
Online since: March 2004
Authors: Junichi Koike
The grain-size dependence on deformation mechanism was found to affect yielding behavior both microscopically and macroscopically which can influence various mechanical properties such as fatigue and creep.
In order to improve the latter two properties, deformation mechanism should be better understood and controlled.
%Zn (AZ31) alloys were used for mechanical testing and microstructure observation.
The horizontal axis is a ratio of Schmid factor of the corresponding nonbasal slip systems to that of the basal slip systems.
In the case of single crystal CRSS data [2-5], nonbasal slip becomes active when the Schimid factor ratio (the S ratio) is more than 100.
Online since: July 2014
Authors: Er Liang Liu, Yong Chun Zheng, Jiao Li, Hong Yan Ju, Li Guo Zhao
The residual stress of machined surface is an important factor affecting the fatigue strength of parts.
Residual stress is a very complex issue, process parameters, the tool geometry parameters, material matched and processing factors all affect the residual stress.
(2) When cutting the 45# steel, with the increase of cutting depth, the trends affecting of cutting force and cutting temperature of the WF and QF Groove cutting inserts are same, but the margin of cutting force and cutting temperature of the QF cutting inserts is larger than the WF.
International Journal of Mechanical Sciences. 2005, 47:1611-1628
Mechanical Engineers and Engineering Manufacture 2002,216 (1):47-54
Online since: May 2020
Authors: Jian Quan Liang, Lin Li, Yue Wang, Li Wei Liu, Hai Tao Feng, Hong Da Zhang, Wei Sun
However, in high latitudes of China, the temperature in winter often reaches to -40°C and keeps for a long time, which leads to a series of problems existed generally in state monitoring devices, such as poor accuracy, short life, low reliability and high maintenance cost, seriously affecting the stability of its application in cold areas and bringing great challenge to state monitoring device [1].
As an important parameter reflecting the thermal properties of materials, the coefficient of thermal conductivity has vital guiding value in theoretical research and engineering application.
The Principle and Methods of Experiment As to the low temperature insulation materials, the main factors affecting their coefficients of thermal conductivity include the types of materials, humidity ratio, the direction of heat flow, the characteristics of pore, the size of volume-weight (density), the particle size of materials, filling gas, specific heat capacity, etc.
Since the mechanical properties of materials can be characterized by the thermal insulation property experiment during the material experiment, the project team will verify its effectiveness of thermal insulation through the thermal insulation property experiment of low-temperature resistant materials in order to develop low-temperature resistant materials which are suitable for the long-term operation of the state monitoring device at low temperature.
(In Chinese ) [8] Li Zhenyu, in: Harbin Institute of Technology, 2009, Preparation and properties of organosilic-based flexible multi-layer heat insulation materials.
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