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On the Experimental Determination of CTOD Based R-Curves

  • D. Hellmann
  • K.-H. Schwalbe

Summary

It is demonstrated that the British Standard BS 5762 for measuring the crack tip opening displacement (CTOD) can be modified such that the resulting CTOD is equal to the CTOD measured at the fatigue crack tip. The modifications consist of accounting for crack growth and adjustment of the rotation factor to the material under consideration. The results obtained on six different materials show that the rotation factor depends slightly on the material and is independent of specimen type, crack length, specimen thickness, and amount of crack growth.

Keywords

Crack Length Crack Mouth Rotation Factor Clip Gage Single Edge Notch Bend 
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References

  1. 1.
    Hellmann, D., Schwalbe, K.-H.; Geometry and Size Effects on J-R and S-R Curves Under Plane Stress Conditions, 15th National Symposium on Fracture Mechanics, College Park, Maryland, 7–9 July 1982, published in ASTM STP 833, R.J. Sanford, Ed., American Society for Testing and Materials, Philadelphia, 1984, pp. 577–605.Google Scholar
  2. 2.
    Schwalbe, K.-H., Hellmann, D.; Correlation of Stable Crack Growth with the J-Integral and the Crack Tip Opening Displacement, Effects of Geometry, Size, and Material, GKSS-Research Center Geesthacht GmbH, Report GKSS 84/E/37, Geesthacht 1984.Google Scholar
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    British Standard BS 5762:1979, Methods for Crack Opening Displacement (COD) Testing. The British Standards Institution.Google Scholar
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    Dawes, M.G.; Technical presentation at the meeting of ASTM Task Group E24.08.05, Dallas, Oct. 23, 1984.Google Scholar
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    Aeberli, K.E.; to be published.Google Scholar

Copyright information

© Springer-Verlag Berlin, Heidelberg 1986

Authors and Affiliations

  • D. Hellmann
    • 1
  • K.-H. Schwalbe
    • 1
  1. 1.GKSS Research Center GeesthachtGeesthachtFederal Republic of Germany

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