Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 154, Issue -, Pages 29-40Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2017.05.012
Keywords
Blunt notch; Effective fracture toughness; Notch failure assessment diagram
Funding
- EDF Energy's R6 development programme
- NNL
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This paper uses Weibull stress analysis to investigate whether the effective notch toughness K-mat(rho) for cleavage fracture measured using Compact Tension (CT) specimens containing a U-notch is dependent on the size and geometry of the CT specimen. Notched CT specimens are typically used to measure a material's effective notch toughness K-mat(rho) and to assess failure of a structure containing a non-sharp defect using the Notch Failure Assessment Diagram (NFAD). The paper concludes that K-mat(rho) is dependent on specimen thickness B over and above the microstructural weakest link effect arising from differences in the volume of the plastic zone; K-mat(rho) is a function of not only the in-plane effect of the notch radius but also an out-of-plane constraint loss which itself is enhanced by the presence of the notch radius. This out-of-plane constraint loss can be more significant than the in-plane effect of the notch radius. The use of experimentally measured K-mat(rho) values in an NFAD assessment of a notched structure may therefore be non-conservative if the out-of-plane constraint loss in the CT specimen is more significant than in the structure. For the material considered in this paper, doubling the thickness B of the CT specimen resulted in plane strain conditions being sufficiently dominant to eliminate out-of-plane constraint loss in the CT specimen. (C) 2017 Elsevier Ltd. All rights reserved.
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