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Mixed-mode crack growth in ductile thin-sheet materials under combined in-plane and out-of-plane loading

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Abstract

Ductile thin-sheet structures, such as fuselage skin or automobile panels, are widely used in engineering applications. These structures often-times are subjected to mixed mode (I/II/III) loading, with stable crack growth observed prior to final fracture. To characterize specific specimen deformations during stable tearing, a series of mixed-mode I/III stable tearing experiments with highly ductile thin-sheet aluminum alloy and steel specimens have been measured by using three-dimensional digital image correlation (3D-DIC). Measurements include (a) specimen’s deformed shape and 3D full-field surface displacement fields, (b) load-crack extension response and (c) crack path during stable tearing, (d) angular and radial distributions of strains and (e) the mixed mode crack-opening displacement (COD, measured at 1-mm from crack tip along crack surface) variation as a function of crack extension. Results indicate that for both aluminum alloy and steel at all mixed-mode I/III loading conditions (Φ = 30°, 60° and 90°), the crack tip fields have almost identical angular and radial polar strain distributions. The mixed mode I/III fields were different from those observed for the nominal Mode I loading case (Φ = 0°). The effect of the Mode III loading component is that it lowers the magnitude of the dominant strain component ε θθ ahead of the growing crack tip and increases the singularity of the strain as compared with that in the mode I case. In addition, measurements indicate that the average mixed mode I/III stable COD for AL6061-T6 (GM6208 steel) is 4×(3×) greater than the average Mode I stable COD.

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Authors and Affiliations

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

    J.-H. Yan, M. A. Sutton, X. Deng & Z. Wei

  2. GM Research and Development Center, Warren, MI, 48090, USA

    Pablo Zavattieri

Authors
  1. J.-H. Yan
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  2. M. A. Sutton
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  3. X. Deng
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  4. Z. Wei
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  5. Pablo Zavattieri
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Correspondence to J.-H. Yan.

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Yan, JH., Sutton, M.A., Deng, X. et al. Mixed-mode crack growth in ductile thin-sheet materials under combined in-plane and out-of-plane loading. Int J Fract 160, 169–188 (2009). https://doi.org/10.1007/s10704-009-9420-x

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  • DOI: https://doi.org/10.1007/s10704-009-9420-x

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