Abstract
The effect of J, temperature, loading rate and pre-crack depth on stretch zone width have been examined. This revealed that changes in stretch zone width with pre-critical J and temperature are larger than measurement uncertainties and thus can be determined with confidence. Changes in stretch zone width with loading rate are smaller; large changes in velocity are required if changes in stretch zone width are to be measured. No change in stretch zone width with pre-crack depth could be detected. In all cases, secondary shear cracks complicated the assessments.
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