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Fatigue Testing and Analysis Under Variable Amplitude Loading Conditions
ASTM Selected Technical Papers
Fatigue Testing and Analysis Under Variable Amplitude Loading Conditions
By
PC McKeighan
PC McKeighan
1
Southwest Research Institute
?
San Antonio, Texas Symposium Co-chairman and Editor
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N Ranganathan
N Ranganathan
2
University François Rabelais de Tours
?
Tours,
France
Symposium Co-chairman and Editor
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ISBN-10:
0-8031-3479-7
ISBN:
978-0-8031-3479-9
No. of Pages:
582
DOI:
https://doi.org/10.1520/STP1439-EB
Publisher:
ASTM International
Publication date:
2005
eBook Chapter

High Cycle Variable Amplitude Fatigue of a Nodular Cast Iron

By
GB Marquis
GB Marquis
1
Professor
,
Lappeenranta University of Technology
, P. O. Box 20,
FIN-53851, Lappeenranta,
Finland
.
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,
BR Rabb
BR Rabb
2
Section Manager
,
Wärtsilä Technology
, P. O. Box 244,
FIN-65101, Vaasa,
Finland
.
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,
P Karjalainen-Roikonen
P Karjalainen-Roikonen
3
Senior Research Scientist
,
VTT Industrial Systems
, P. O. Box 1704,
FIN-02044 VTT (Espoo),
Finland
.
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Doi:
https://doi.org/10.1520/STP11308S
Page Count:
17
  • Published:
    2005

This paper provides a brief summary of life prediction methods for variable amplitude fatigue. Special attention is given to cracks propagating from nominally defect free components in the high cycle regime where a significant portion of the fatigue damage can be attributed to cycles with amplitude less than the fatigue limit observed under constant amplitude loading. Constant and variable amplitude fatigue data for a nodular cast iron are presented. An effective stress method for variable amplitude loaded similar to the Topper model is developed. Most model parameters are derived from constant amplitude S-N curves and the Haigh diagram, but two sets of long life variable amplitude tests are needed to derive the variable amplitude interaction parameters.

Keywords:
nodular cast iron, variable amplitude fatigue, high cycle fatigue, crack closure

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