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Effect of Crack Extension in a Compact Tension C(T) Specimen Containing a Residual Stress on the Stress Intensity Factors

[+] Author Affiliations
Simon Kamel, Catrin Davies, Kamran Nikbin

Imperial College London, London, UK

Hyeong Lee

Korea Atomic Energy Research Institute, Daejeon, Korea

Paper No. PVP2010-25157, pp. 1275-1280; 6 pages
doi:10.1115/PVP2010-25157
From:
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-49255 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME

abstract

Compact tension C(T) specimens with a blunt notch are mechanically pre-compressed to introduce a tensile residual stress ahead of the notch. The specimens are then thermally soaked which results in crack extension due to the presence of the tensile residual stress. Neutron diffraction measurements are performed on the pre-compressed specimens and after thermal soaking, to determine the redistribution of the residual stress as the crack extends. Stress intensity factors (SIF’s) are estimated using an upper-bound linear distribution to model the redistribution of residual stress as the crack extends. These are compared with the SIF’s using a membrane stress of yield magnitude which ignores redistribution of residual stress with crack extension.

Copyright © 2010 by ASME

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