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Experimental Study of Third Body Entrapment and Its Effect on Friction and Wear

Experimental Study of Third Body Entrapment and Its Effect on Friction and Wear. Weiyi Wang (Michelle) Research Assistant. Outline. Personal background Motivation Objectives Background of third body effects Experiments Test rig Future work. Personal Background. Joined METL – Aug. 2013

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Experimental Study of Third Body Entrapment and Its Effect on Friction and Wear

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  1. Experimental Study of Third Body Entrapment and Its Effect on Friction and Wear Weiyi Wang (Michelle) Research Assistant

  2. Outline • Personal background • Motivation • Objectives • Background of third body effects • Experiments • Test rig • Future work Personal Background • Joined METL – Aug. 2013 • B.E. Department of Precision Instruments and Mechanology from Tsinghua University, Beijing, China – Jul. 2013

  3. Motivation • Third body was introduced by Godet in the 70’s to characterize the discontinuous and heterogeneous interface that separates two bodies in contact.- M. Renouf, 2011 • Debris loosely trapped  respond kinetically to situations; transportation of debris • Mechanical functions of third bodies – protect contact surfaces 1. load carrying; 2. velocity accommodation; 3. solid lubrication, decrease wear A. Tsouknidas, Advances in Tribology, Friction Induced Wear of Rapid Prototyping Generated Materials: A Review, Volume 2011 I. Sallit*, C. Richard*, R. Adam†, F. Robbe-Valloire‡, Characterization Methodology of a Tribological Couple: Metal Matrix Composite/Brake Pads, Materials Characterization,Volume 40, Issue 3, March 1998, Pages 169–188 ① Elimination of ‘natural’ screen ② First body interaction ③ Passage from two to three-body contact ④ Steady state three-body contact Velocity accommodation in a classical two-dimensional contact Y. BERTHIER, EXPERIMENTAL EVIDENCE FOR FRICTION AND WEAR MODELLING, Wear, 139 (1990) 77 - 92 Maurice Godet, Third-bodies in Tribology, Wear, 136 (1990) 29 - 45 M. Renouf , H.-P.Cao,V.-H.Nhu。 Multiphysical modeling of third-body rheology ， Tribology International 44 (2011) 417–425

  4. Objectives • Develop an wear model to predict the effects of third body on wear • Analyze the effect of different sizes and orientations of surface textures (grooves) on wear • Study the effects of load and sliding velocity on third body entrapment • Extend Modeling approach developed by Leonard et al. • Simulate the experimentally observed effects in a numerical / FE model

  5. Background of Third Body Effects Particledetachment Flow Third body – behavior inside the contact N. Fillot a,∗, I. Iordanoff b, Y. Berthiera，Wear modeling and the third body concept，Wear 262 (2007) 949–957 Particleejection Wear Rheological properties of debris VelocityAccommodation Influence factors -Contact shape -Contact conformity -Mass of third bodies -Relative motion velocity, direction -Pressure FB1 S1 TBS1  S2 TBb  S3 TBS1  S2 FB1 S1 Competition of the source flow and wear flow, as functions of the mass Mi of the third body. Elastic M1 Normal breaking M2 Shearing M3 Rolling M4 S: 5 sites M: 4 modes Velocity accommodation mechanisms N. Fillot a,∗, I. Iordanoff b, Y. Berthiera，Wear modeling and the third body concept，Wear 262 (2007) 949–957 Y. Berthier, Experimental evidence for friction and wear modeling, Wear, 139 (1990) 77 - 92

  6. Experiments Variables Motion ①Rotational Groove size Wear & Friction Load Sliding velocity Width (µm): 10, 20, 30 Depth (µm): 10, 20, 30 ② Reciprocate

  7. Test Rig Modification on holder forflat contact Instruments Pin and disk machine Fixture for pins Laser machine

  8. Future Work • Extend the experiments to more materials • Evaluate the effect of different material properties like yield strength, hardness etc. on wear influenced by third bodies • Numerical modeling of the third body effect for different contact configurations

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