The Effect of a Higher Loading Rate on the JIc Fracture Toughness Transition Temperature of HY Steels

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Abstract
The objectives of the study were to extend the JIc transition temperature analysis of earlier work for HY130 to HY80 steel and also to determine the effect of a higher strain rate on the JIc fracture toughness of both HY80 and HY130 steels. The fracture parameter JIc in both low and high strain rate tests demonstrated a ductile to brittle transition in HY80 and HY130 steels analogous to Charpy V notch transition behavior. The JIc transition temperature from slow rate tests was less conservative than that from fast rate tests. The JIc transition temperatures from slow and fast rate tests gave less conservative transition temperatures than those from Charpy tests. SEM stereo pair fractography showed that the transition from ductile to brittle behavior was not as gradual for the fast rate testing as previously reported for slow rate tests.

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