Abstract
An analytical model namely the “Composite Crack Profile (CCP) model” has been presented earlier for the evaluation of crack tip opening displacement (CTOD) from the measured crack mouth opening displacements (CMODs). The model has been applied in the present work for the small scale yielding situation under the conditions of different specimens and loading geometries (SEN tension, SEN bending, CT). The CTOD evaluated by the model has been compared with the CTOD obtained by the methods prescribed in [A. A. Wells, Symp. Crack Propagation, Paper B4, College of Aeronautics, Cranfield (1961), and T. Hollstein and J. Blanel, Int. J. Fracture 13, 385 (1977).] It is sufficient that whereas the model does not necessitate the use of rotational factor for the evaluation of CTOD, it is more versatile in that it can be used with different loading geometries. The effect of thickness, a/w ratio and the loading geometry on the CTOD at crack initiation (CTOD i) has also been presented and discussed.
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