Shape optimization and parameter analysis of link chain
| Autor: | Chung-Seng Wu, 吳忠信 |
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| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 This thesis studies the stresses in step chain subjected to differenert loadings. When the link is assembled,the interference fit occures between the link plate and the pin or bush.This interference fit produce stresses in the link before subjecting to external loading.Upon moving to the tight side,the link takes the maximum loading which includes the external loading and the loading due to interference fit.When the link enters the slake side,the external loading approaches zero.Therefore in a complete cycle,the loading applied to a link varies between two values.The fatigue failure may occur.This thesis analyzes the fatigue problem and proposes some ways to improve fatigue life.Another failure of a link may be due to wear.Archard theory is used to estimate the wear depth of the pin and the bush.Based on Hertz theory and contact analysis by finite element method,the location of maximum wear deoth can be found. To improve the fatigue life of the link, the parameter analysis is done in this thesis. The diameter of the pin and the bush and the amount of interference are analyzed, some suggestions are made. Another approach used in this thesis to improve fatigue life is to use shape optimization to find the optimum shape of the link plate to reduce the maximum stress,various shape basis vectors are generated and used to optimize the boundary of the link.The maximum stress in optimied shape is proved to be less than that in the original shape. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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