Digital Repository, Giornata IGF Forni di Sopra (UD) 2011

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An elastic solution for the stress field at the tip of a Mode II propagating fatigue crack
M. W. Brown

Last modified: 2011-02-25


It is notoriously difficult to achieve experimentally stable shear mode crack propagation in Mode II.
The elastic stress field around a sharp elliptical crack is examined, using the classical solution of Inglis and Savin,
and it is compared to the linear elastic fracture mechanics solution to reveal some important shortcomings of
the latter approximate singular solution. Graphs of the characteristic stress field around a blunt crack are
presented for Modes I and II. The crack tip radius of curvature and the size of the fatigue failure process zone
required for stable shear mode cracking are discussed.

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