Numerical evaluation of geometric independent stretch zone width value for assessing valid JSZW

Abstract To obtain geometry independent SZW c based evaluation of initiation fracture toughness ( J SZW ) value, there is a need to know the variation of SZW c with geometry. The present work attempts to predict this variation using the newly developed energy based numerical evaluation method of SZW prediction. The minimum thickness fracture specimen criteria available in the literature are also evaluated for determining the geometry independent J SZW value. To measure valid elastic–plastic fracture toughness value, the present study also showed the possibility of further improving the minimum thickness criterion of fracture specimen.