The following item for ballot is intended as an update to ASTM E647 Annex A3 to modify the back-face strain compliance equation for the ESE(T) specimen. The rationale for this modification is to have consistency between the form of the equation being proposed for the C(T) specimen (in a separate ballot item) and that being proposed in this item. The new equation also permits a slightly expanded range of validity over the current equation.
Keywordsconstant amplitude; crack size; fatigue crack growth rate; stress intensity factor range;
Draft Under Development