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The effect of superimposed hydrostatic pressure on shear decohesion in round bar tensile specimens

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Abstract

The modified Gurson–Tvergaard–Needleman model, that considers shear decohesion as an increment in the total void volume fraction, is used to investigate the effect of superimposed hydrostatic pressure on the ductility of a round bar specimen. Experiments indicate that the fracture mode is not uniform across the cross section of a round bar specimen–no shear damage exists at the center while it is pronounced at the edge. The damage mechanisms of shear decohesion and void growth are delayed by applying superimposed hydrostatic pressure, which leads to an increase in the fracture strain and ductility. However, the effect of pressure on ductility depends on the location within the cross section. Void growth at both the center and the edge becomes increasingly delayed with increasing pressure, but this effect is more significant at the edge because of the existence of shear stress. Shear decohesion at the edge becomes the dominant damage mechanism, rather than void growth, when pressure is increased. The numerical results presented herein are used to explain and discuss this phenomenon in depth.

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Acknowledgements

The very useful comments and suggestions by two anonymous reviewers were greatly appreciated. This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC, Project No: RGPIN-2016-06464).

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Authors and Affiliations

  1. Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada

    M. M. Shahzamanian, Amir Partovi & P. D. Wu

  2. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, T6G 2W2, Canada

    M. M. Shahzamanian

  3. NORAM Engineering and Constructors Ltd., 200 Granville Street, Suite 1800, Vancouver, BC, V6C 1S4, Canada

    Chris Thomsen

  4. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Zhutian Xu

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  1. M. M. Shahzamanian
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  2. Chris Thomsen
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  3. Amir Partovi
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  4. Zhutian Xu
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  5. P. D. Wu
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Correspondence to M. M. Shahzamanian.

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Shahzamanian, M.M., Thomsen, C., Partovi, A. et al. The effect of superimposed hydrostatic pressure on shear decohesion in round bar tensile specimens. Int J Fract 233, 179–194 (2022). https://doi.org/10.1007/s10704-021-00614-y

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  • DOI: https://doi.org/10.1007/s10704-021-00614-y

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