Export file:

Format

  • RIS(for EndNote,Reference Manager,ProCite)
  • BibTex
  • Text

Content

  • Citation Only
  • Citation and Abstract

Mutual interaction of stress concentration and stress intensity factor between semi-circular notch and crack

Tractebel (ENGIE), Avenue Ariane 7, 1200 Brussels, Belgium

Special Issues: Interaction of Multiple Cracks in Metallic Components-Volume 2

When cracks are detected during examination, assessments have to be done in order to demonstrate the fitness-for-service (FFS) of the component for continued operation. In order to assess a crack, it has firstly to be characterized as surface or subsurface according to its distance to the free surface of the component. The re-characterization process from subsurface-to-surface crack is addressed in all FFS Codes. The specific criteria for the rules on transforming subsurface cracks to surface cracks differ among the FFS Codes and assume regular free surface of the component. In this article, in order to further improve the subsurface-to-surface flaw proximity rules, a new parameter is investigated: the presence of a geometrical discontinuity at the free surface of the component. The analysis, conducted through extended finite element calculations, considered the interaction between a circular subsurface crack and the free surface with stress concentration induced by a circular notch. After analyzing the stress profiles in the notch-crack neighborhood, the calculations have highlighted that, for a given stress concentration at the free surface of the component, for a given ligament and for a given crack depth, the interaction between the crack and the notch highly depends on the notch radius. These results lead to the proposal of a new subsurface-to-surface proximity rule accounting for the interaction between circular crack and the free surface of the component impacted by a stress concentration due to a circular notch.
  Figure/Table
  Supplementary
  Article Metrics

References

1. Hasegawa K, Li Y (2010) Assessment of fatigue crack growths for transformed surface flaws using FFS codes. Proceedings of ASME 2010 Pressure Vessels and Piping Division Conference, Boston, USA.

2. Lacroix V, Li Y, Strnadel B, et al. (2015) Recharacterization of subsurface flaw to surface flaw based on equivalent fatigue crack growth rate. J Pressure Vessel Technol 138: 024701–024701-6.    

3. Lacroix V, Katsumata G, Li Y, et al. (2016) Effect of the thickness on re-characterization of subsurface-to-surface flaw: application on piping and vessels. Proceedings of ASME 2016 Pressure Vessels and Piping Division Conference, Vancouver, Canada.

4. Glinka G, Newport A (1987) Universal features of elastic notch-tip stress fields. Int J Fatigue 9: 143–150.    

5. Lazzarin P, Tovo R (1996) A unified approach to the evaluation of linear elastic stress fields in the neighborhood of cracks and notches. Int J Fracture 78: 3–19.

6. Liu M, Gan Y, Hanaor D, et al. (2015) An improved semi-analytical solution for stress at round-tip notches. Eng Fract Mech 149: 134–143.    

7. Torabi AR, Pirhadi E (2015) Stress-based criteria for brittle fracture in key-hole notches under mixed mode loading. Eur J Mech A-Solid 49: 1–12.

8. ASME B&PV Code Section XI (2007) Rules for in-service inspection of nuclear power plant components.

9. Sukumar N, Moes N, Moran B, et al. (2000) Extended finite element method for three-dimensional crack modeling. Int J Numer Meth Eng 48: 1549–1570.

10. Duflot M (2007) A study of the representation of cracks with level sets. Int J Numer Meth Eng 70: 1261–1302    

11. Inglis CE (1913) Stresses in a plate due to the presence of cracks and sharp corners. Spring Meetings of the Fifty-fourth Session of the Institution of Naval Architechts.

Copyright Info: © 2016, Pierre Dulieu, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

Download full text in PDF

Export Citation

Article outline

Show full outline
Copyright © AIMS Press All Rights Reserved