Previous work has demonstrated that there exists an empirical correlation between the nil-ductility transition temperature (NDTT) and structural crack arrest behaviour. The present work comprises three-dimensional elastic-plastic finite element analysis of the 'Pellini' specimen geometry and instrumented drop-weight tests to study the mechanics of this test, and to reconcile the correlation with fracture mechanics principles. It is shown that the existing correlation can be explained in terms of a consistent stress intensity factor at crack arrest in both drop-weight specimens and in large-scale, structurally representative crack arrest tests. The findings enhance the confidence in the drop-weight test as a measure of structural crack arrest behaviour.
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