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Cyclic fatigue damage characteristics observed for simple loadings extended to multiaxial life predictionFully reversed uniaxial strain controlled fatigue tests were performed on smooth cylindrical specimens made of 304 stainless steel. Fatigue life data and cracking observations for uniaxial tests were compared with life data and cracking behavior observed in fully reversed torsional tests. It was determined that the product of maximum principle strain amplitude and maximum principle stress provided the best correlation of fatigue lives for these two loading conditions. Implementation of this parameter is in agreement with observed physical damage and it accounts for the variation of stress-strain response, which is unique to specific loading conditions. Biaxial fatigue tests were conducted on tubular specimens employing both in-phase and out-of-phase tension torsion cyclic strain paths. Cracking observations indicated that the physical damage which occurred in the biaxial tests was similar to the damage observed in uniaxial and torsional tests. The Smith, Watson, and Topper parameter was then extended to predict the fatigue lives resulting from the more complex loading conditions.
Document ID
19880015632
Document Type
Contractor Report (CR)
Authors
Jones, David J. (Illinois Univ. Urbana, IL, United States)
Kurath, Peter (Illinois Univ. Urbana, IL, United States)
Date Acquired
September 5, 2013
Publication Date
June 1, 1988
Subject Category
STRUCTURAL MECHANICS
Report/Patent Number
NAS 1.26:182126
NASA-CR-182126
Funding Number(s)
PROJECT: RTOP 506-60-12
CONTRACT_GRANT: NAG3-465
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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