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Fatigue of aluminum as affected by temperature and intermittent periods of rest

Citation

Berry, John Warren (1956) Fatigue of aluminum as affected by temperature and intermittent periods of rest. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-03182004-143645

Abstract

This investigation was undertaken in an attempt to determine the behavior of high purity aluminum when subjected to fatigue stressing in rotary bending at various elevated temperatures, and also to study the effects on fatigue life when the material was given intermittent periods of rest. Two types of rest periods were given; 1) room temperature resting from fatigue cycling at elevated temperature, and 2) resting at higher temperature after stressing at ambient temperature. Because of the limited time available and the desire to apply statistical methods of analysis, testing was restricted to only a single stress level for each phase of the experiment.

Up to the highest temperature tested (600[degrees]F), results for continuous stress cycling indicate a gradual reduction in fatigue life with temperature. Rest periods at room temperature contributed only negligible changes in fatigue life, but all tests with rest periods at elevated temperature disclosed a sizable increase. The increase in fatigue life was a maximum when resting was carried out at temperatures in the neighborhood of the recrystallization temperature. In addition, it is curious to note, that in the continuous cycling tests, scatter of results was a sharp minimum at recrystallization temperature.

Item Type:Thesis (Engineer's thesis)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Sechler, Ernest Edwin
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1956
Record Number:CaltechETD:etd-03182004-143645
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-03182004-143645
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:993
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:18 Mar 2004
Last Modified:26 Dec 2012 02:34

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