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Shear Failure of Inconel 718 under Dynamic Loads

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Abstract

Kinetics of deformation and fracture of nickel–iron alloy Inconel 718 under dynamic shear loading was measured using a split torsional Hopkinson bar facility and high-speed photography. Tubular specimens with a reduced gage length and a starter notch were sheared at strain rates up to 6 × 103 s−1. High-speed photographs of fiducial lines scribed on the specimen surface showed the development of local strains and cracking. This paper describes the experimental and analytical procedures, illustrates average and local plastic strain evolution, and presents shear crack initiation times and propagation speeds.

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Acknowledgments

This work was performed for NASA under the Swales Aerospace subcontract S40902 in support of the NESC team led by Mr. Clinton Cragg and Ms. Leslie Curtis investigating the root cause of stud hang-up.

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Authors and Affiliations

  1. Center for Fracture Physics, Materials Research Laboratory, SRI International, Menlo Park, CA, 94025, USA

    D. A. Shockey (SEM member), J. W. Simons (SEM member), C. S. Brown & T. Kobayashi

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  1. D. A. Shockey
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  2. J. W. Simons
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  3. C. S. Brown
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  4. T. Kobayashi
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Correspondence to D. A. Shockey.

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Shockey, D.A., Simons, J.W., Brown, C.S. et al. Shear Failure of Inconel 718 under Dynamic Loads. Exp Mech 47, 723–732 (2007). https://doi.org/10.1007/s11340-007-9068-2

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  • DOI: https://doi.org/10.1007/s11340-007-9068-2

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