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High Strain Rate Fracture Properties of High Strength Steels and Their Application

[+] Author Affiliations
Alan M. Clayton

A. M. Clayton Ltd., Warrington, UK

John Dabinett

AWE plc, Aldermaston, Reading, UK

Paper No. PVP2011-57254, pp. 83-87; 5 pages
doi:10.1115/PVP2011-57254
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; Nondestructive Evaluation; Nuclear Engineering
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4455-7
  • Copyright © 2011 by British Crown

abstract

The evaluation of fracture of ferritic steels using the methods in ASME Code Case 2564 for impulsively loaded vessels requires the static reference temperature T0 and the upper shelf toughness, and these are used together with the Master Curve to define the transition temperature curve. The effect of high rates of strain on the ductile-brittle transition is determined in the code case using a correlation due to Wallin. Two steels used for impulsively loaded vessels, welded steel similar to HY80 plate and a cast steel similar to HY100 have been evaluated to obtain their static fracture and strength properties. Additional instrumented pre-cracked Charpy testing using a draft ISO standard has determined the shift in T0 with high strain rates and the results have been compared to the Wallin correlation. The strain rate correlation is used to evaluate the fracture response of vessels made of these steels when subjected to internal blast. By using the instantaneous strain rates of the vessel wall vibration considerable gains in critical crack size can be obtained compared to using the highest rate throughout the whole of the transient.

Copyright © 2011 by British Crown

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