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The effect of temperature cycling on the physical properties of 75S-T6 aluminum alloy sheet metal

Citation

Robinson, Winthrop P. (1953) The effect of temperature cycling on the physical properties of 75S-T6 aluminum alloy sheet metal. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-05122003-121943

Abstract

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This thesis is a report on the results of an experimental investigation into the effects of cyclic heating and cooling prior to testing on the tensile and creep properties of aluminum alloy 75S-T6 Alclad sheet. A similar investigation concerning magnesium alloy sheet is described by J. N. Lindsley in Reference 1.

Specimens of 75S-T6 Alclad sheet were cyclically heated in an electric oven to either 250 [degrees] F or 550 [degrees] F and cooled to 100 [degrees] F. All specimens remained at elevated temperature an aggregate of 60 minutes , with the number of cycles during the hour varying from one to twenty. Tensile tests and short time creep tests (6 minutes) were performed at room temperature and at the temperature of heat treatment.

It was found that at room and elevated temperatures the modulus of elasticity and 0.2 per cent yield strength were essentially independent of the number of heating cycles, as were the minimum creep rates at room temperature and at 250 [degrees] F. The minimum creep rate at 550 [degrees] F increased exponentially with the number of cycles. Specimens heat treated at 550 [degrees] F and creep tested at room temperature showed practically no creep at any stress in six minutes.

Without regard to the cycling, the 0.2 per cent yield strength at room temperature was relatively unaffected by the 250 [degree] F heat treatment, but was reduced by a factor of four or more by the 550 [degree] F heat treatment. The modulus of elasticity at room temperature after either heat treatment remained very near the value for the untreated material at room temperature. Values from test conducted at elevated temperatures have been given in reports of previous investigations.

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:
  • Sechler, Ernest Edwin (chair)
  • Clark, Donald S.
  • Williams, Max L.
Defense Date:1 January 1953
Record Number:CaltechETD:etd-05122003-121943
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-05122003-121943
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1739
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:13 May 2003
Last Modified:26 Dec 2012 02:41

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