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On ratchetting-based models of Wear and Rolling Contact Fatigue* (RCF)

  • Luciano Afferrante and Michele Ciavarella
Published/Copyright: May 28, 2013
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Materials Testing
From the journal Materials Testing Volume 48 Issue 3

Abstract

Recent efforts to develop simple unified models of both wear and rolling contact fatigue (Kapoor et al. [1], Franklin et al. [2]) are discussed, in view of previous theoretical and experimental results on ratchetting in rolling contact. It is shown that ratchetting in rolling contact is a combination of “structural ratchetting” (that modelled with the perfect plasticity model) and “material ratchetting”, and the latter is very sensitive to the hardening behaviour of the material. Also, rolling contact fatigue at large number of cycles in the Clayton and Su experiments [3, 4] seems not well correlated with shakedown theory, and accordingly, simple ratchetting equations based on excess of shakedown such as that of Tyfoor et al. [5], do not seem well suited as a Wohler SN life curve. However, these conclusions are only very qualitative as the materials in the two tests are different, and at present empirical separate models for wear and rolling contact fatigue based on hardness of materials and a posteriori data fitting seem the only quantitative way forward for engineering purposes.

Kurzfassung

Die bisherigen Anstrengungen zur Entwicklung einfacher und einheitlicher Modelle für beides, die Abtragungs- und die Rollkontakt-Ermüdung nach Kapoor et al. [1] und Franklin et al. [2]) werden im vorliegenden Beitrag im Licht neuer theoretischer und experimenteller Resultate zum Ratchetting bei Rollkontakt diskutiert. Es wird gezeigt, dass Ratchetting bei Rollkontakt eine Kombination von “structural ratchetting” (das mit dem vollständigen Plastizitätsmodell dargestellt werden kann) und “material ratchetting” darstellt, das sehr sensitive in Bezug auf das Verfestigungsverhalten des Werkstoffes ist. Darüber hinaus scheint die Rollkontakt-Ermüdung bei hohen Lastspielzahlen in den Experimenten von Clayton und Su [3, 4] nicht mit der so genannten shakedown Theorie abgestimmt zu sein, so dass einfache Gleichungen zum Ratchetting, wie zum Beispiel die von Tyfoor et al. [5] sich zur Darstellung nicht so gut eigneten wie Wöhler-Kurven. Da die Werkstoffe in den beiden Tests jedoch unterschiedlich waren, sind diese Schlussfolgerungen nur sehr qualitative und bisher erscheinen separate empirische Modelle für die Abtragungs- und Rollkontakt-Ermüdung basierend auf der Härte der Werkstoffe und nachfolgende Angleichung der Werte als der einzige nach vorn führende Weg für technische Anwendungen.

Dr. Ing. Luciano Afferrante, born in 1976, got the Diploma Liceo Classico in 1995 with the highest vote. He graduated on Mechanical Engineering at Politecnico di Bari with the highest vote in 2001. At present he is PhD student on Mechanical Engineering at Politecnico di Bari with the supervision of Proff. Ciavarella and Demelio. His research activity concerns: contact mechanics (in particular rolling contact fatigue), thermo-elastic-dynamic contact and fracture statistics problems. He is author of 13 articles on International Journals and numerous articles on International Conferences.

Prof. Ing. Michele Ciavarella, PhD, born in Bari in 1970, graduated from PoliBA in Mech. Eng. in 1994 with laude, and 3 years later got his PHD with a thesis on “Contact Problems with friction and application to the study of Fretting Fatigue”, tutors Prof. G. Monno & Prof. D. A. Hills, Univ. Oxford. He has spent various periods of study in UK and USA; in particular, at the U. of Michigan, U. Oxford, U. Harvard, MIT, Purdue, WPAF Res Lab, UC Berkeley. In Oct. 1998 moved as Senior Research Fellow to USouthampton, UK. In Feb. 1999 he returned to Italy, with a position as Senior Researcher at CNR (National Research Council). From Nov. 2002, he is Associate Professor at the second Faculty of Engineering of the Politecnico di Bari, Italy. His interests span various areas of contact mechanics and fatigue, on which he has published about 60 journal papers.

*

Contribution to the 7th International Conference on Biaxial/Multiaxial Fatigue and Fracture (7ICBMFF)

References

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Published Online: 2013-05-28
Published in Print: 2006-03-01

© 2006, Carl Hanser Verlag, München

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  1. Inhalt/Contents
  2. Inhalt
  3. DGZfP-Mitteilungen
  4. Organschaft
  5. Fachbeiträge/Technical Contributions
  6. Normung von Prüfverfahren in der Bauakustik
  7. Fatigue damage of weld seams with and without postweld treatment under multiaxial loading*
  8. On ratchetting-based models of Wear and Rolling Contact Fatigue* (RCF)
  9. A constitutive high cycle fatigue damage model – based on the interaction between microplasticity and local damage*
  10. A statistical measure of the non-proportionality of stresses – investigations and applications*
  11. Multiaxial fatigue life and strength criteria for non-proportional loading*
  12. Predicting fatigue life of welded aluminium joints with combined bending and torsion using energy based criteria*
  13. Reliability evaluation of NDT techniques for Cu-welds for risk assessment of nuclear waste encapsulation
  14. Vorschau/Preview
  15. Vorschau
https://doi.org/10.3139/120.100713

Articles in the same Issue

  1. Inhalt/Contents
  2. Inhalt
  3. DGZfP-Mitteilungen
  4. Organschaft
  5. Fachbeiträge/Technical Contributions
  6. Normung von Prüfverfahren in der Bauakustik
  7. Fatigue damage of weld seams with and without postweld treatment under multiaxial loading*
  8. On ratchetting-based models of Wear and Rolling Contact Fatigue* (RCF)
  9. A constitutive high cycle fatigue damage model – based on the interaction between microplasticity and local damage*
  10. A statistical measure of the non-proportionality of stresses – investigations and applications*
  11. Multiaxial fatigue life and strength criteria for non-proportional loading*
  12. Predicting fatigue life of welded aluminium joints with combined bending and torsion using energy based criteria*
  13. Reliability evaluation of NDT techniques for Cu-welds for risk assessment of nuclear waste encapsulation
  14. Vorschau/Preview
  15. Vorschau
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