The Theory Relating the Woehler Equation to Cumulative Damage in the Distribution Fatigue Life.

Ft. Belvoir Defense Technical Information Center FEB 1974.

54 p.

APPROVED FOR PUBLIC RELEASE.

A theoretical model which is able to encompass the observed fatigue growth phenomena of crack acceleration or crack deceleration, crack arrest, and crack jump at a change of load level, is proposed for the expected incremental crack growth rate under programmed loads. The parameters are calculated by techniques which match the crack growth rate using earlier data on striation counts obtained by electron fractography for an aluminum alloy. The implications of this model for determining an appropriate distribution of fatigue life are noted. (Author).

English

January 31, 2011