Fatigue of metallic alloys at sub-millimeter sizes
- This thesis reviews fatigue data available in the literature for smaller size scales, focusing on metallic alloys. Then, it summarizes different testing approaches that have been developed to perform fatigue testing of small specimens. With that background, we set out to build a machine that would allow for very simple, precise, and efficient testing of fatigue properties of engineering materials at a sub-millimeter size scale. We determined that using rotating wire as the method of testing fatigue was the simplest way to ensure that fatigue would happen where we predicted in a specimen (wire). It also avoided the need to manufacture tiny specimens, which can be challenging. It allowed for a high cyclic frequency and precise determination of stress, based on the geometry of the bend of a wire. The machine needed to maintain the length of the wire very precisely in order to maintain the desired stress levels. Using a motor mounted to a translation stage, and bushings set at fixed intervals, we were able to control the geometry and create a precise rotating wire machine. Analyses supporting the design of the test machine are provided, as well as a detailed description of the design.
|Type of resource
|electronic; electronic resource; remote
|1 online resource.
|Stanford University, Department of Mechanical Engineering.
|Statement of responsibility
|Submitted to the Department of Mechanical Engineering.
|Thesis (Engineering)--Stanford University, 2017.
- © 2017 by Daniel Arnold
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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