A set of finite element simulations was performed to analyze the creep behavior of an elastic–perfectly plastic hemisphere in contact with a rigid flat. This study focuses on the time-dependent stress relaxation of a fully plastic asperity. Assuming a Garofalo (hyperbolic sine) type material creep law, the asperity shows two distinct phases of relaxation. In the first phase, the asperity creeps with an accelerated creep rate and shows a contact area increase similar to that of a cylindrical geometry. In the second phase, no contact area change can be measured and the asperity creeps with a slower rate. Empirical evolution laws for the asperity creep behavior are presented, analyzing the influence of both material and geometrical parameters. The results are interpreted in terms of transient friction.
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April 2009
Research Papers
Creep Relaxation of an Elastic–Perfectly Plastic Hemisphere in Fully Plastic Contact
Andreas Goedecke,
Andreas Goedecke
Institute of Technical Mechanics,
andreas.goedecke@students.jku.at
Johannes Kepler University
, 4040 Linz, Austria; Actuators and Control, Siemens Corporate Technology
, 81379 Munich, Germany
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Randolf Mock
Randolf Mock
Actuators and Control,
randolf.mock@siemens.com
Siemens Corporate Technology
, 81379 Munich, Germany
Search for other works by this author on:
Andreas Goedecke
Institute of Technical Mechanics,
Johannes Kepler University
, 4040 Linz, Austria; Actuators and Control, Siemens Corporate Technology
, 81379 Munich, Germanyandreas.goedecke@students.jku.at
Randolf Mock
J. Tribol. Apr 2009, 131(2): 021407 (10 pages)
Published Online: March 6, 2009
Article history
Received:
January 10, 2008
Revised:
January 25, 2009
Published:
March 6, 2009
Citation
Goedecke, A., and Mock, R. (March 6, 2009). "Creep Relaxation of an Elastic–Perfectly Plastic Hemisphere in Fully Plastic Contact." ASME. J. Tribol. April 2009; 131(2): 021407. https://doi.org/10.1115/1.3081978
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