1.1 This practice describes the adjusted compliance ratio (ACR) method to estimate the effects of closure on the crack driving force. The ACR method is based on a ratio of elastic and secant compliances from the unloading compliance curve and the same measurement signals that are used for the opening force method in Appendix X2 of Test Method E647, which describes a method for analyzing the nonlinearity in the compliance curve during each loading cycle to estimate the 2 % crack-opening force. 1.2 The ACR method builds on the opening force method of closure determination as well as the compliance method of crack size determination, so familiarity and conformity with Appendix X2 and Annex A5 of Test Method E647 are assumed. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
The title and scope are in draft form and are under development within this ASTM Committee.
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