SYMPOSIA PAPER Published: 01 January 1997

The Three Thresholds for Fatigue Crack Propagation


The three governing threshold conditions in metal fatigue are considered, one relating to crack growth in single crystals, one concerned with crack growth in polycrystalline materials, and one based on linear elastic fracture mechanics (LEFM).

All three conditions are examined in relation to the two physical processes of cracking, i.e., Stage I (shear) and Stage II (tensile) crack growth.

The LEFM threshold is seen as a lower bound condition for fatigue crack growth rate, and the single crystal threshold is viewed in relation to the fundamental threshold pertaining to the fatigue resistance of polycrystalline metals.

Author Information

Miller, KJ
University of Sheffield, Sheffield, UK
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Developed by Committee: E08
Pages: 267–286
DOI: 10.1520/STP16238S
ISBN-EB: 978-0-8031-5355-4
ISBN-13: 978-0-8031-2412-7