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    High Cycle Variable Amplitude Fatigue of a Nodular Cast Iron

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    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.


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

    Author Information:

    Marquis, GB
    Professor, Lappeenranta University of Technology, Lappeenranta,

    Rabb, BR
    Section Manager, Wärtsilä Technology, Vaasa,

    Karjalainen-Roikonen, P
    Senior Research Scientist, VTT Industrial Systems, VTT (Espoo),

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP11308S