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The impact of a number of testing variables on the measurement of fatigue crack growth thresholds is discussed. References are made to the original works from which the current recommendations for measurement of threshold in ASTM E 647 were derived. The applicability of these original recommendations in light of advances made since that time is discussed. In addition, the effects of some commonly overlooked parameters and features, such as residual stress and environment, on the measurement and interpretation of crack growth thresholds are presented.
fatigue, crack growth, threshold
Assistant Professor, US Air Force AcademyUSAF Academy, CO
Director, Fracture Technology Associates, Bethlehem, PA
Technical Consultant, Alcoa Technical Center, Aluminum Company of America, Alcoa Center, PA