Threshold Stress For Short Fatigue Crack Growth
Author(s)
A. Plumtree. N. Untermann & J. Petermann
Abstract
A model is presented that predicts the fatigue limit of a metal by determining the
threshold stress and critical length of short cracks. Once this length is exceeded,
fatigue cracks continue to grow, causing eventual failure. The threshold stress range
for short fatigue crack is related to the strain intensity factor range by considering
surface strain distribution and crack closure. The surface strains decrease whereas
closure increases with crack length. The resulting threshold stress for short crack
growth increases to a maximum that corresponds to the endurance limit stress. This
occurs at the critical crack length corresponding to a depth of about four grain
diameters. In
Keywords
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