Abstract
With the determination of load-time curve recorded by Amsler/Roell RKP 450 Instrumented Charpy Impact test and based on the Newton's Second Law, Impact character of a single standard V-notch specimen of X70 pipeline steel under the low temperature -70°C was investigated by studying the impact energy distribution. It was revealed that maximum load point (F m point) was not exact the dynamic crack initiation, which was detected somewhere prior and very close to F m point by using Compliance Changing Rate method. This fact was also confirmed by Dynamic CTOD method. That is to say, Impact energy related to the F m point (i.e. E m ) consists not only the crack initiation energy E i , but a small part of crack extension energy as well. Ratio of E i /E m was found to be 0.90 just applicable to the material used here. Dynamic fracture toughness J 1d was then estimated by modified Rice equation. Crack extension behavior and dynamic crack growth resistance curve (J-Δa) during stable crack propagation period was carefully analyzed by Key Curve method. Finally. methods for evaluating tearing module T mat and CTOD curve under the impact test were also briefly introduced in the paper.
Published Version
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