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Effects of lubricant’s friction coefficient on warm compaction powder metallurgy LI Yuan-yuan(李元元), NGAI Tungwai Leo(倪东惠), WANG Shang-lin(王尚林), ZHU Min(朱 敏), CHEN Wei-ping(陈维平) (College... produce different lubrication effects and their optimal application temperature will be different. Three different lubricants were used to study the effects of friction coefficient on warm compaction......
that the measured K0 in secondary compression can be described by equations related to internal friction angle, secondary compression coefficient, compression index, recompression index, and sediment time...; secondary compression; internal friction angle; cementation 1 Introduction The main application of coefficient of earth pressure at rest (K0) at higher consolidation pressures is to determine earth......
Experimental investigation of friction coefficient in tube hydroforming Hyae Kyung YI 1, Hong Sup YIM 1, Gun Yeop LEE 1, Sung Mun LEE 1, Gi Suk CHUNG 2, Young-Hoon MOON 1 1. Engineering Research... Received 21 April 2010; accepted 10 September 2010 Abstract: The friction coefficient between tube and die in guide zone of tube hydroforming was obtained. In hydroforming, the tube is expanded......
such as aerospace and automotive, the trends and challenges of friction study in plastic forming were proposed. Key words: plastic forming; friction model; lubricant; friction coefficient 1 Introduction.... Two test specimens were required to determine a friction coefficient. One specimen was pulled between cylindrical pins supported by ball or roller bearings. Friction on the bearings was considered......
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that in the ring-block sliding wear test, with time prolonging, the friction coefficient of all samples becomes more and more stable, and the mass wear loss increases. Among such samples, the samples with low density hold high friction coefficient between 0.13-0.18. In the pin-dish sliding wear test, at room temperature, under 20N test, the friction coefficient of the sample with rough lamination......
of the internal friction coefficient of the granular system under different normal pressures were obtained by self-designed shear test. By the granule volume compression test, the accurate discrete element... the microscopic view. Based on the DEM, the influence of granule diameter, surface friction coefficient, normal pressure and shear velocity on the internal friction coefficient of the granular system were studied......
. The reason is that there are too skidding pavements. The problems were discussed here from the tribological aspect. 1 Adhesion coefficient To sure the car travel safely on road, enough friction... E=300-400 MPa, Poisson ratio), tangent stress is: (13) When the radial loading and normal reaction force are equal, , adhesion coefficient equals the static friction coefficient......
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lubrication, the influence of parameters of surface texture and operation conditions on friction coefficient was studied by solving lubrication computation model of surface texture. The results show... of friction coefficient and the influence of depth and diameter on friction coefficient is studied separately, but when the aspect ratio lies in 0.005 to 0.01, the corresponding friction coefficient......