STP1439: High Cycle Variable Amplitude Fatigue of a Nodular Cast Iron

    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),

    Pages: 17    Published: Jan 2005


    Abstract

    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


    Paper ID: STP11308S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP11308S


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