Investigation of dynamic fracture toughness (J{sub}(Id)) behaviour of strength mis-matched Q & T steel weldments using instrumented Charpy impact testing

摘要

Instrumented Charpy impact testing has been used for evaluating the, dynamic fracture behaviour of mis-matched Q & T steel weldments. The effect of strength mis-match on the dynamic fracture toughness (J{sub}(Id)) and dynamic crack resistance curves (J{sub}d-R) of HAZ and weld metals specimens are discussed. The crack propagation and mode of failure due to impact loading are analyzed through SEM and correlated with dynamic resistance curves.