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Cumulative creep-fatigue damage evolution in an austenitic stainless steelA model of cumulative creep-fatigue damage has been developed which is based on the use of damage curve equations to describe the evolution of creep-fatigue damage for four basic creep-fatigue cycle types. These cycle types correspond to the four fundamental cycles of the Strain Range Partitioning Life Prediction approach of Manson, Halford, and Hirschberg. A concept referred to as Damage Coupling is introduced to analytically account for the differences in the nature of the damage introduced by each cycle type. For application of this model, the cumulative creep-fatigue damage behavior of type 316 stainless steel at 816 C has been experimentally established for the two-level loading cases involving fatigue and creep-fatigue, in various permutations. The tests were conducted such that the lower life (high strain) cycling was applied first, for a controlled number of cycles, and the higher life (lower strain) cycling was conducted at the second level, to failure. The proposed model correlated the majority of the observed cumulative creep-fatigue data.
Document ID
19920062607
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mcgaw, Michael A.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Subject Category
Metallic Materials
Report/Patent Number
E-5755
Meeting Information
Meeting: Advances in Fatigue Lifetime Predictive Techniques
Location: San Francisco, CA
Country: United States
Start Date: April 24, 1990
Accession Number
92A45231
Distribution Limits
Public
Copyright
Other

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