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Workshop 3. The Cod Method for Assessing the Significance of Defects

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Elastic-Plastic Fracture Mechanics
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Abstract

The COD method for assessment of the significance of defects in weldments, BS:PD6493, is described and then applied to a simple problem of a non-stress relieved butt weld in a two-dimensional configuration. The sequence of analysis is first outlined for those who may wish to attempt their own solution. The example is solved both by following the standard method and by an alternative application of the principles in which certain simplifications of PD6493 are not made. The problem is then extended to deeper cracks and to combined tension and bending of a three-dimensional defect, both with and without residual stress, in order to illustrate their dominant role in such problems, and also the judgements that may have to be made outside the terms of the standard procedures.

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References

  1. ‘Guidance on some methods for the derivation of acceptance levels for defects in fusion welded joints.’ PD6493, 1980, BSI (London)

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  2. Kamath, M.S. ‘The crack tip opening (CTOD) design curve: some prospects for incorporating stress gradient effects’. Fitness for Purpose Validation of Welded Construction0. Welding Institute, Cambridge, Paper 23

    Google Scholar 

  3. Folias, E.S. ‘The effect of initial curvature on cracked sheets,’ Eng. Fract. Mech. 2, 1970, pp. 151 – 169

    Article  Google Scholar 

  4. Bucci, R.J. et al. ‘J-integral estimation procedures. ’ Fracture Toughness, ASTM STP514, 1972, pp. 40 – 69

    Article  Google Scholar 

  5. ‘Methods for crack opening displacement (COD) testing’. BS5762, 1979, BSI (London)

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  6. Smith, I. et al. ‘Assessment of fracture toughness requirements for the deck structure of the Hutton Tension Leg Platform, using finite elements and the CTOD design curve.’ Offshore Tech. Conf., Texas, 1982

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  7. Rooke, D.D., Cartwright, D.C. ‘Compendium of stress intensity factors’. HMSO (London) 1979

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  8. Towers, O.L. & Garwood, S.J.. 1980. ‘The geometry-dependence and significance of maximum load toughness values’. ECF-3, Ed. Radon, J.C., Pergamon, pp. 57 – 68

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  9. Towers, O.L. & Garwood, S.J. (1980). ‘Maximum load toughness’, Int. Jour.Fract.16, pp.R85–R91

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© 1985 ECSC,EEC,EAEC, Brussels and Luxembourg

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Turner, C.E. (1985). Workshop 3. The Cod Method for Assessing the Significance of Defects. In: Larsson, L.H. (eds) Elastic-Plastic Fracture Mechanics. Ispra Courses on Materials, Engineering and Mechanical Science. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5380-2_15

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  • DOI: https://doi.org/10.1007/978-94-009-5380-2_15

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-8874-9

  • Online ISBN: 978-94-009-5380-2

  • eBook Packages: Springer Book Archive

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