Abstract
Crack size measurement is necessary in order to calculate stress intensity factor (SIF), K. Definition of the initial crack size in plain specimens is more complex than notched specimens because artificial defects are not introduced. In this study, the effect of difference between initial crack size calculated with both average grain size and maximum shear mode crack size on K, and fatigue limit value, σw were examined. A new alternative method to predict endurance limit of plain specimen, σw with a combination of threshold stress in shear mode and in Mode I was proposed.
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