"Back-face strain compliance relation for compact specimens for wide r" by J. C. Newman Jr., Y. Yamada et al.

National Aeronautics and Space Administration

 

Date of this Version

2011

Citation

Engineering Fracture Mechanics 78 (2011) 2707–2711; doi:10.1016/j.engfracmech.2011.07.001

Abstract

A back-face strain (BFS) compliance relation has been developed for the standard compact C(T) specimen for a very wide range in crack-length-to-width (a/W) ratios. Both finiteelement and boundary-element methods were used to develop the BFS relation for a/W ratios from 0.2 to 0.95. In addition, experimentally determined compliance values on four metallic materials compared well with the new relation over nearly the complete a/W range. The new relation can be used to monitor crack-length-against-cycles using computerized crack-monitoring systems that are currently used with the crack-mouthopening- displacement (CMOD) gage method, and the relation has been cast in a standard form compatible with existing compliance crack length monitoring systems.

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