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Re-examination of cumulative fatigue damage analysis: An engineering perspectiveA method which has evolved in our laboratories for the past 20 yr is re-examined with the intent of improving its accuracy and simplicity of application to engineering problems. Several modifications are introduced both to the analytical formulation of the Damage Curve Approach, and to the procedure for modifying this approach to achieve a Double Linear Damage Rule formulation which immensely simplifies the calculation. Improvements are also introduced in the treatment of mean stress for determining fatigue life of the individual events that enter into a complex loading history. While the procedure is completely consistent with the results of numerous two level tests that have been conducted on many materials, it is still necessary to verify applicability to complex loading histories. Caution is expressed that certain phenomena can also influence the applicability - for example, unusual deformation and fracture modes inherent in complex loading - especially if stresses are multiaxial. Residual stresses at crack tips, and metallurgical factors are also important in creating departures from the cumulative damage theories; examples of departures are provided.
Document ID
19860018208
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Manson, S. S. (NASA Lewis Research Center Cleveland, OH, United States)
Halford, G. R. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1986
Subject Category
Structural Mechanics
Report/Patent Number
E-3066
NASA-TM-87325
NAS 1.15:87325
Report Number: E-3066
Report Number: NASA-TM-87325
Report Number: NAS 1.15:87325
Meeting Information
Meeting: Symposium on Mechanics of Damage and Fatigue
Location: Haifa-Tel Aviv
Country: Israel
Start Date: July 1, 1985
End Date: July 5, 1985
Sponsors: International Union of Theoretical and Applied Mechanics
Accession Number
86N27680
Funding Number(s)
PROJECT: RTOP 553-13-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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