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A Modification of J-Q Theory and Its Applications

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Abstract

To more effectively quantify constraint effects on crack-tip fields and fracture resistances in ductile materials, a modification of the J-Q theory (O'Dowd and Shih, 1991) is proposed by introducing a parameter Q*. Results show that Q* is a load-independent constraint parameter under LSY or fully plastic deformation. The validity of J-Q* description has been demonstrated by three applications to: (a) predict crack-tip fields without further FEA calculations; (b) rank constraint levels for different fracture specimens; (c) predict constraint-corrected J-R curves.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of South Carolina, Columbia, SC, 29208, USA

    X.K. Zhu

  2. Department of Marine Engineering, Mokpo National Maritime University, Chonnam, Mokpo, 530729, South Korea

    S.K. Jang

  3. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Y.F. Chen

Authors
  1. X.K. Zhu
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  2. S.K. Jang
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  3. Y.F. Chen
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Zhu, X., Jang, S. & Chen, Y. A Modification of J-Q Theory and Its Applications. International Journal of Fracture 111, 47–52 (2001). https://doi.org/10.1023/A:1012424711672

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  • DOI: https://doi.org/10.1023/A:1012424711672

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