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Keywords: compressibility
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Journal Articles
Article Type: Research Papers
J. Tribol. January 2011, 133(1): 011501.
Published Online: December 2, 2010
... quantitatively observed during the upsetting of cylinders with a central conical dent using the new fluorescence direct observation apparatus developed by the authors. Moreover, the permeation phenomena were estimated using a rigid-plastic finite element analysis model incorporating the compressibility...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2010, 132(3): 031701.
Published Online: June 4, 2010
... compressibility compressible flow liquid films lubrication micromechanical devices lubrication squeeze film microsystems MEMS inertia effects In several recent experiments on microsystem devices involving the squeezing of a liquid film, researchers have found results that appear...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2010, 132(2): 021403.
Published Online: March 11, 2010
... to those with compliant coatings under the same contact conditions. For stiffer coatings, the values of the von Mises stress and compressive surface stress increase and the positions of maximum von Mises stress move up to the surface; meanwhile, the distributions of the compressive stress become asymmetric...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2009, 131(4): 042202.
Published Online: September 24, 2009
... and distribution for inset materials with various stress-strain behaviors. Measurements of permanent deformation and load-deflection behavior of specimens held under applied compression over time showed dependence of the amount of permanent deformation on strain energy. Design rules were extracted from results...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2009, 131(1): 011503.
Published Online: December 4, 2008
... gained attention in the field of EHL, along with Tait’s equation of state for compressibility. The well-established Carreau viscosity model has been used to describe the simple shear-thinning encountered in EHL. The simulation results have been used to develop an approximate equation for traction...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2009, 131(1): 011704.
Published Online: December 2, 2008
...Thomas Geike; Valentin L. Popov The negative squeeze lubrication problem is investigated by means of numerical simulations that account for the dynamics of vaporization. The model is based on bubble dynamics, governed by the Rayleigh–Plesset equation, and the Reynolds equation for compressible...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041802.
Published Online: August 7, 2008
... compressibility is an exception. The difference between viscosity measurements and the portrayal of the pressure dependence of viscosity in the EHL literature ( 9 10 11 12 13 14 ) Recently, EHL simulations ( 19 20 21 ) using realistic viscosity have achieved an excellent agreement...
Journal Articles
Article Type: Technical Briefs
J. Tribol. January 2006, 128(1): 218–220.
Published Online: September 17, 2005
...Roger Tuomas; Ove Isaksson A high-pressure chamber is used to study lubricant compressibility when refrigeration oil is diluted by refrigerant. The tested lubricant in this work is a POE (polyol ester) oil, POE diluted with nonchlorinated (HFC) refrigerant R-134a, a naphthenic mineral oil...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2006, 128(1): 155–167.
Published Online: May 17, 2005
...S. Kondo; R. S. Sayles; M. J. S. Lowe The paper describes an experimental technique combining optical interferometry and ultrasonic attenuation to measure the bulk modulus (compressibility) and film thickness profiles of oil and grease films entrapped between a stationary steel ball and a sapphire...
Journal Articles
Article Type: Technical Papers
J. Tribol. July 2003, 125(3): 543–551.
Published Online: June 19, 2003
...D. E. A. van Odyck; C. H. Venner A multigrid numerical solution algorithm has been developed for the laminar (Stokes) flow of a compressible medium in a thin film. The solver has been applied to two model problems each representative of lubrication problems in a specific way. For both problems...
Journal Articles
Article Type: Technical Papers
J. Tribol. January 2003, 125(1): 25–32.
Published Online: December 31, 2002
..., the maximum compressive forces attained during the contact process far exceed the predictions of Hertzian contact theory. The discrepancy between results of this simulation and those of the static-equilibrium analytical and numerical models indicate that dynamic interactions play a significant role...
Journal Articles
Article Type: Technical Papers
J. Tribol. January 2001, 123(1): 108–117.
Published Online: July 20, 2000
...Coda H. T. Pan, Engineering Consultant, The pressurization-flow characteristic of a helical viscous compressor is basic to the design of precision air bearings and non-contact gas seals which make use of the spiral-grooved surface feature. The method of Compressible Narrow Groove Analysis (CNGA...