This work develops a methodology for the FEM simulation of a multi-piece crankshaft. Various simulation models that include press-fit joint contact conditions and complex meshing schemes are examined in order to accurately capture details of the stress fields present at the stress concentration area (labeled as the SCA) on the edge of the press-fit. The maximum stress components are demonstrated to be of limited values (non-singular) and Hertzian in nature. To obtain the stress convergence sufficiently small elements, which can be determined using a 2-D axisymmetric model, are required at the vicinity of the SCA. The same level of mesh refinement is then used for large 3-D FEM models of the crankshaft geometry, to study the resulting behavior of the press-fit joint for the dynamic operating loads. However, it may not always be possible or practical, as some limits on the mesh refinement have to be imposed to obtain a
reasonable computational time to run such models. Less complex 'equivalent' symmetrical FEM models are investigated to determine if these models can provide a sufficient level of accuracy at an acceptable computational effort. Such models may be useful as practical design tools, producing data to speed up the decision making process. The simulation results are compared to some test data for the stress state monitored in real crankshafts under operating conditions. 'Intuitive' design sensitivities to various crankshaft parameters are examined as well. The numerical tools and engineering rules developed in the thesis may be applied to systematically improve the design by extending the joint's life and/or load carrying capability.
| Identifer | oai:union.ndltd.org:USASK/oai:usask.ca:etd-01192009-125633 |
| Date | 19 January 2009 |
| Creators | King, Jeffrey Allan |
| Contributors | Szyszkowski, Walerian |
| Publisher | University of Saskatchewan |
| Source Sets | University of Saskatchewan Library |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://library.usask.ca/theses/available/etd-01192009-125633/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University of Saskatchewan or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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