Efficiency of thermal energy dissipation in dry rubbing

The changes in friction and wear, especially during the run-in period, are strongly correlated to the blockage of energy dissipation paths within the sliding materials. As such, the preservation of the tribological integrity of a rubbing material depends, mainly, on the efficiency of dissipation of the friction induced thermal energy (FITE). This paper therefore, studies the mechanistic evolution of FITE and the process of its dissipation during sliding. The study focuses on the intrinsic aspects of the dissipation process. In particular, the role of the mechano-physical properties (conductivity, diffusivity, hardness, etc.) and their respective variation with temperature is studied comprehensively. This is achieved by studying the behavior of two contrasting rubbing pairs: mild steel (AISI 1020) sliding on itself and, a stainless steel (AISI 304HN) sliding on a mild steel counterpart. The results indicate that the external sliding parameters (nominal load and speed) are of limited influence on the dissipation process. The major influence, however, is assumed by the change in the thermal properties and more dominantly, by the rate of degradation of the conductivity in the contacting layers of the rubbing pair. These results support the view that wear generation is, in essence, an intrinsic energy dissipation mechanism the aim of which is to consume part of the FITE released at the surface.

[1]  Hisham A. Abdel-Aal,et al.  On friction-induced temperatures of rubbing metallic pairs with temperature-dependent thermal properties , 1998 .

[2]  The Unlubricated Sliding Wear of Steels: The Contact Conditions in the Sliding Zone , 1996 .

[3]  A. Alpas,et al.  Wear mechanism maps for metal matrix composites , 1997 .

[4]  S. L. Rice,et al.  Formation of Subsurface Zones in Impact Wear , 1981 .

[5]  D. Rigney,et al.  Sliding wear of 304 and 310 stainless steels , 1985 .

[6]  Francis E. Kennedy,et al.  Contact Surface Temperature Models for Finite Bodies in Dry and Boundary Lubricated Sliding , 1993 .

[7]  J. F. Archard,et al.  The temperature of rubbing surfaces , 1959 .

[8]  J. Föhl,et al.  Wear as an energy transformation process , 1978 .

[9]  F. F. Ling,et al.  An experimental study of the correlation between wear and entropy flow in machinery components , 2000 .

[10]  H. Abdel-aal.  On the connection of thermal dilatation to protective layer formation in the fretting of metallic tribo-specimens , 2001 .

[11]  J. C. Jaeger.  Moving sources of heat and the temperature at sliding contacts , 1943, Journal and proceedings of the Royal Society of New South Wales.

[12]  James Barber,et al.  The conduction of heat from sliding solids , 1970 .

[13]  F. Stott,et al.  The influence of oxides on the friction and wear of alloys , 1978 .

[14]  H. Abdel-aal.  The correlation between thermal property variation and high temperature wear transition of rubbing metals , 2000 .

[15]  Brian Vick,et al.  Theoretical surface temperatures generated from sliding contact of pure metallic elements , 2000 .

[16]  H. Blok,et al.  The flash temperature concept , 1963 .

[17]  On the Influence of Thermal Properties on Wear Resistance of Rubbing Metals at Elevated Temperatures , 2000 .

[18]  H. Blok.  The postulate about the constancy of scoring temperature , 1970 .

[19]  A. Alpas,et al.  Transition between mild and severe wear in aluminium alloys , 1997 .

[20]  On the thermal compatibility of metallic pairs in rubbing applications , 1999 .

[21]  Fretting-induced damage between contacting steel-polymer surfaces , 1977 .

[22]  J. Greenwood.  Flash Temperatures for Bodies Moving at Equal High Speeds in Opposite Directions , 1996 .

[23]  T. Quinn.  Review of oxidational wear: Part I: The origins of oxidational wear , 1983 .

[24]  L. P. Golan,et al.  Thermal Effects Due to Surface Films in Sliding Contact , 1994 .

[25]  F. F. Ling,et al.  Probable interface temperatures of solids in sliding contact , 1964 .

[26]  Thermal kinetics of protective oxide layer formation in the dry sliding of metallic tribo-specimens , 2002 .

[27]  J. Barber,et al.  Distribution of Heat between Sliding Surfaces , 1967 .

[28]  Brian Vick,et al.  BOUNDARY ELEMENT THERMAL ANALYSIS OF SLIDING CONTACT , 1991 .

[29]  J. Bos,et al.  Frictional heating of tribological contacts , 1995 .

[30]  F. F. Ling.  A quasi-iterative method for computing interface temperature distributions , 1959 .

[31]  Zhao Dawei,et al.  Analytical study of the effect of a circumferential feeding groove on the unbalance response of a rigid rotor in a squeeze film damper , 1998 .

[32]  I. L. Singer,et al.  Fundamentals of friction : macroscopic and microscopic processes , 1992 .

[33]  J. Greenwood.  An interpolation formula for flash temperatures , 1991 .

[34]  F. F. Ling,et al.  On irreversible thermodynamics for wear prediction , 2002 .

[35]  Jeng Haur Horng,et al.  True Friction Power Intensity and Scuffing in Sliding Contacts , 1998 .

[36]  Hisham A. Abdel-Aal,et al.  On the interdependence between kinetics of friction-released thermal energy and the transition in wear mechanisms during sliding of metallic pairs , 2003 .

[37]  A. Alpas,et al.  High-temperature wear and deformation processes in metal matrix composites , 1996 .

[38]  F. F. Ling,et al.  THERMAL ASPECTS OF GALLING OF DRY METALLIC SURFACES IN SLIDING CONTACT. Technical Report No. 5 , 1955 .

[39]  On the influence of tribo-induced superheating on protective layer formation in dry sliding of metallic pairs , 2001 .