Model of severe wear under sliding or impact sliding /
| Main Author: | |
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| Other Authors: | , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1990.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | Severe sliding and impact-sliding (compound) wear were modeled using the energy approach. The fractional energy dissipated as heat was modeled from material deformation models. Using this energy fraction, the energy dissipated by wear processes was isolated. The effects included in the model are the total work involved in the wear processes, heat lost by chip removal (ablation), heat consumed by oxidation, work to initiate particles at inclusions (delamination), the work stored by material structural change and the work required to create new surface area. The model was evaluated using data for pure metals, data for alloys from literature, and from experiments on a compound wear test machine. The research established conditions where dislocation, delamination, and ablation wear could dominate the wear process. Oxidation was modeled using both kinetic and thermodynamic principles. The model explains the transitions normally seen in oxidational controlled wear. Lastly the model explains the wear rate seen when bulk melting of the surface occurs. The primary use of the energy model is diagnostic, particularly in determining when wear is thermally controlled. This model is effective at energy input rates where the thermal ablation does not overwhelm other effects. Accuracy of the model dimenishes as surface melting, and other high temperature processes become significant. Some of this error may be due to the assumption that heat conduction in machine components match the conductivity of the test materials. It may be possible to predict minimum wear rates for various material combinations, but predicted values would be much less than experienced in service. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Mechanical engineering." |
| Physical Description: | xx, 238 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |