SawyerThesis - Vapor-Phase Lubrication in Combined Rolling...

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August 1999 Vapor-Phase Lubrication in Combined Rolling and Sliding Contacts: Modeling and Experimentation W. Gregory Sawyer A Thesis Submitted to the Graduate Faculty of Rensselaer Polytechnic Institute in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Major Subject: Mechanical Engineering Approved by the Examining Committee: _________________________________________ Thierry Blanchet, Thesis Advisor _________________________________________ John Tichy, Member _________________________________________ Aleksandar Ostrogorsky, Member _________________________________________ Cornelius Moynihan, Member Rensselaer Polytechnic Institute Troy, New York
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ii Dedicated to: Floyd William Worley Grandfather; Teacher; Gentleman © Copyright 1999 by W. Gregory Sawyer All Rights Reserved
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iii Table of Contents List of Figures l P AGE iii Preface l P AGE iv Outline l P AGE ix Abstract l P AGE xix Summary l P AGE xx 1 Introduction l P AGE 1 2 Historical Review of Vapor-Phase Lubrication l P AGE 6 3 Research Motivation and Objectives l P AGE 16 4 Theory l P AGE 20 5 Experiments l P AGE 38 6 Results l P AGE 43 7 Discussion l P AGE 53 8 Concluding Remarks l P AGE 61 Appendixes l P AGE 62
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iv List of Figures 4.1) Schematic of fractional coverage lubrication in a rolling and sliding contacts l Page 22 4.2) Predictions of vapor pressure effects on vapor-phase lubrication l Page 28 4.3) Predictions of sliding speed effects on vapor-phase lubrication l Page 29 4.4) Predictions of rolling speed effects on vapor-phase lubrication l Page 30 4.5) Predictions of wear-track length effects on vapor-phase lubrication l 4.6) Predictions of wear-track length ratio effects on vapor-phase lubrication l Page 31 4.7) Predictions of the non-dimensional deposition term l Page 34 4.8) Predictions of the non-dimensional sliding speed l Page 35 4.9) Predictions of the non-dimensional rolling speed l Page 36 4.10) Predictions of the non-dimensional load l Page 37 5.1) The WAM-1 combined rolling and sliding apparatus l Page 38 6.1) Friction coefficient history of unlubricated contacts of M50 steel at 540ºC l Page 43 6.2) Demonstration of vapor-phase lubrication with atmospheres containing acetylene l Page 44 6.3) Friction coefficient history of acetylene partial pressure excursions l Page 46 6.4) Traction curve of acetylene partial pressure l Page 47 6.5) Friction coefficient history of sliding speed excursions l Page 48 6.6) Traction curve of sliding speed l Page 49 6.7) Friction coefficient history of rolling speed excursions l 6.8) Traction curve of rolling speed l Page 51 6.9) Friction coefficient history of disk wear-track diameter excursions l Page 52 6.10) Traction curve of disk wear-track diameter l 7.1) Traction curve of rolling speed l Page 54 7.2) Friction coefficient history of sliding speed excursions at constant disk rotational speed l Page 56 7.3) Traction curve of sliding speed at constant disk rotational speed l Page 57 7.4) Friction coefficient history of diameter excursions at constant disk rotational speed l Page 58
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v 7.5) Traction curve of disk wear-track diameter at constant disk rotational speed l Page 59 A2.1) A composite surface contact l Page 63 A3.1) Schematic of fractional coverage lubrication in a pin-on-disk contact l Page 67 A3.2) Model comparisons with the experiments of Zaidi
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SawyerThesis - Vapor-Phase Lubrication in Combined Rolling...

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