Plastic Analysis of Extrusion Wear
Date Issued
2009
Date
2009
Author(s)
Chen, Yu-Hung
Abstract
Extrusion wear is a new phenomenon which was discovered in recent years. We can see from the pin-on-disc testing that the pin wear became severe suddenly when the speed and load exceeded some critical values. Meanwhile, the metal became softer because of high temperature and was sheared by tangential force. Some debris was thus formed with shinning sparks and its components were almost metal, but not oxide. This mechanism is quite different from oxidational wear and is now termed as extrusion wear. In this study, mechanics of plasticity was used to evaluate the extrusion wear of pin with Gaussian distribution assumption of asperity height. The result shows that there was still 2 to 10 times the gap between theoretical and real values. Lots of assumption and simplification was necessary in this study because the interaction between two contacting bodies is complicated and microcosmic. So we thought the gap may be acceptable, and it also indicated that plastic analysis is a feasible direction to analyze the behavior of extrusion wear.
Subjects
extrusion wear
oxidational wear
pin-on-disc
plasticity
Gaussian distribution
sliding contact
Type
thesis
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