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

  • J.-H. Yan
  • M. A. Sutton
  • X. Deng
  • Z. Wei
  • Pablo Zavattieri
Original Paper

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.

Keywords

Mixed mode I/III fracture Ductile materials Thin sheet Digital image correlation Crack tip fields Growing crack Strain field COD CTOD 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • J.-H. Yan
    • 1
  • M. A. Sutton
    • 1
  • X. Deng
    • 1
  • Z. Wei
    • 1
  • Pablo Zavattieri
    • 2
  1. 1.Department of Mechanical EngineeringUniversity of South CarolinaColumbiaUSA
  2. 2.GM Research and Development CenterWarrenUSA

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