Pitfalls to avoid in threshold testing and its interpretation

The impact of a number of testing variables on the measurement of fatigue c rack growth thresholds is discussed: References are made to the original wo rks from which the current recommendations for measurement of threshold in ASTM E 647 Were derived. The applicability of these original recommendation s in light of advances made since that time is discussed. In addition, the effects of some commonly overlooked parameters and features, such as residu al stress and environment, on the measurement and interpretation of crack g rowth thresholds are presented.