- Title
- The fatigue life cycle prediction of a light aircraft undercarriage
- Creator
- Erasmus, Daniel Jacobus
- Subject
- Metals--Fatigue
- Date Issued
- 2010
- Date
- 2010
- Type
- Thesis
- Type
- Masters
- Type
- MTech
- Identifier
- vital:9614
- Identifier
- http://hdl.handle.net/10948/1527
- Identifier
- Metals--Fatigue
- Description
- The reliability of systems relies heavily on accurate fatigue life prediction of related components. Fatigue life prediction is a complicated process requiring the correct methodology to determine accurate and reliable predictions. The Palmgren – Miner damage accumulation hypothesis is widely used in determining the fatigue life of components exposed to variable loading conditions. Modifications have been made to this hypothesis trying to achieve a greater degree of accuracy, of these the Liu – Zenner modification has been the most successful. In this report the systematic process of fatigue life prediction using the Liu – Zenner modification to achieve reliable results is calculated. A representative stress time history measured in service on the component forms the basis for defining a flight cycle which is the chosen unit in which to express the fatigue life. Rainflow cycle counting performed on the stress time history allowed the formulation of a load spectrum to which the component is exposed in one cycle. Combining the load spectrum with the developed SN curve of the component and using the Liu – Zenner modification to the Palmgren – Miner rule a reliable fatigue life in cycles is predicted.
- Format
- xxiv, 118 leaves
- Format
- Publisher
- Nelson Mandela Metropolitan University
- Publisher
- Faculty of Engineering
- Language
- English
- Rights
- Nelson Mandela Metropolitan University
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