Dimples shape and distribution effect on characteristics of Stribeck curve

Abstract A purpose of this research is to study the influence of geometrical characteristics of the surface texture on the Stribeck curve in lubricating sliding.The tribosystem consists of the stationary block pressed at the required constant load 1800 N against the ring rotating at the defined speeds. Tests were conducted at increasing sliding speed of range 0.08–0.69 m/s. Every speed was maintained for 2 min. The test was carried out under conformal contact conditions. The sliding was unidirectional. The block was a part of a bearing sleeve hardened EN-GJS 400-15 cast iron with a hardness value of 50 HRC. The ring samples, 35 mm in diameter, were made from hardened 42CrMo4 steel of hardness 32 HRC. Some variants of specimen surfaces were created by burnishing technique. The area density of oil pockets S was in the range 7.5–20%. The dimples depth to length ratios were between 0.03 and 0.08. Ring surfaces with oil pockets of short drop, long drop and spherical shapes were tested. It was shown that with proper shape and dimensions as well as suitable area density of oil pockets the friction characteristic of the sliding pairs could be improved in comparison to non-textured surfaces.

[1]  Izhak Etsion,et al.  A Model for Mechanical Seals with Regular Microsurface Structure , 1996 .

[2]  I. Etsion,et al.  The effect of surface regular microtopography on fretting fatigue life , 2002 .

[3]  H. So,et al.  Effects of Micro-Wedges Formed Between Parallel Surfaces on Mixed Lubrication - Part I: Experimental Evidence , 2004 .

[4]  R. Gras,et al.  An experimental model for mixed friction during running-in , 2002 .

[5]  Izhak Etsion,et al.  A Laser Surface Textured Parallel Thrust Bearing , 2003 .

[6]  Choongsik Bae,et al.  Frictional modes of barrel shaped piston rings under flooded lubrication , 2000 .

[7]  Izhak Etsion,et al.  Friction-Reducing Surface-Texturing in Reciprocating Automotive Components , 2001 .

[8]  Kôji Katô,et al.  The effect of laser texturing of SiC surface on the critical load for the transition of water lubrication mode from hydrodynamic to mixed , 2001 .

[9]  Kôji Katô,et al.  Loads carrying capacity map for the surface texture design of SiC thrust bearing sliding in water , 2003 .

[10]  Izhak Etsion,et al.  Different aspects of the role of wear debris in fretting wear , 2002 .

[11]  Andrew Gouldstone,et al.  Lubrication regimes in mesothelial sliding. , 2005, Journal of biomechanics.

[12]  Sung Dae Kim,et al.  Application of the duplex TiN coatings to improve the tribological properties of Electro Hydrostatic Actuator pump parts , 2005 .

[13]  Sy-Wei Lo,et al.  A theoretical model of micro-pool lubrication in metal forming , 1999 .

[14]  Michael M. Khonsari,et al.  An Experimental Investigation of Dimple Effect on the Stribeck Curve of Journal Bearings , 2007 .

[15]  Li Xiao,et al.  A study on the effect of surface topography on rough friction in roller contact , 2003 .

[16]  C. Tu,et al.  A study of fiber–capstan friction. 1. Stribeck curves , 2004 .

[17]  Bo Jacobson,et al.  The Stribeck memorial lecture , 2003 .

[18]  Frank E. Talke,et al.  A review of `contact recording' technologies , 1997 .

[19]  I. Etsion,et al.  The effect of various surface treatments on piston pin scuffing resistance , 2006 .

[20]  I. Etsion.  State of the art in Laser Surface Texturing , 2004 .

[21]  Xiaolei Wang,et al.  Improving the Anti-seizure Ability of SiC Seal in Water with RIE Texturing , 2003 .

[22]  Brigid Mullany,et al.  The effect of slurry viscosity on chemical–mechanical polishing of silicon wafers , 2003 .

[23]  Sy-Wei Lo,et al.  Lubricant Permeation From Micro Oil Pits Under Intimate Contact Condition , 1999 .

[24]  Izhak Etsion,et al.  The effect of laser surface texturing on transitions in lubrication regimes during unidirectional sliding contact. , 2005 .

[25]  Izhak Etsion,et al.  Experimental Investigation of Laser Surface Texturing for Reciprocating Automotive Components , 2002 .