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Prediction of crack growth direction for mode I/II loading using small-scale yielding and void initiation/growth concepts

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Abstract

Under the assumption that the processes which control the direction of crack growth in 2024-T3 aluminum are directly related to void initiation and growth, a theoretical framework is developed to predict the direction of crack growth. The basic premise of the framework is that, depending on the mode mixity of the remotely applied loading, either σ m /σeff or σeff triggers the nucleation and growth of voids hence, fracture. The theoretical development uses linear elastic assumptions and two terms in the asymptotic expansion to describe the stress field in the vicinity of the crack tip for a mixed-mode I/II ARCAN specimen. Predictions based on the theory indicate that: (a) the transition from Mode~I type to Mode~II type crack propagation can be accurately quantified, and (b) the direction of crack growth is reasonably well predicted for both types of crack propagation. In addition, a qualitative, but microstructurally based, physical rationale for the observed phenomena is presented.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of South Carolina, Colombia, SC, 29209

    M.A. Sutton, W. Zhao, M.L. Boone & A.P. Reynolds

  2. ASM Inc., Hampton, VA, 23665

    D.S. Dawicke

Authors
  1. M.A. Sutton
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  2. W. Zhao
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  3. M.L. Boone
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  4. A.P. Reynolds
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  5. D.S. Dawicke
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Sutton, M., Zhao, W., Boone, M. et al. Prediction of crack growth direction for mode I/II loading using small-scale yielding and void initiation/growth concepts. International Journal of Fracture 83, 275–290 (1997). https://doi.org/10.1023/A:1007339625267

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  • DOI: https://doi.org/10.1023/A:1007339625267

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