ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 3

The Effect of the Intermediate Principal Stress on Triaxial Fatigue of 7075-T6 Aluminum Alloy

Findley, WN
Professor and technical assistant, Division of Engineering, Brown University, Providence, Rhode Island

Tracy, JF
Professor and technical assistant, Division of Engineering, Brown University, Providence, Rhode Island

Abstract

Fatigue tests of 7075-T6 aluminum alloy under synchronous pulsating triaxial stresses were performed with three different values of the intermediate principal stress. Thick-walled tubes were subjected to internal pressure plus axial stress such that the state of stress at the inner surface was as follows: in the first case, the intermediate principal stress was a compression equal to the internal pressure; in the second, it was a tension equal to the internal pressure; and in the third, it was a tension equal to the hoop stress at the inner surface. Results showed no effect of the intermediate principal stress.

Keywords:
aluminum alloy, combined stress, failure theory, fatigue, principal stress, tresca, triaxial, triaxial fatigue

Paper ID: JTE10043J
DOI: 10.1520/JTE10043J
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