1887

Abstract

Summary

The presented work takes place in the context of the storage of vitrified radioactive wastes. The mechanical behavior of crack in glass under pressure at low strain rate is of great interest. The present work is focused on the time dependency of crack propagation in glass. Experiments are performed in triaxial conditions on thermally cracked boro-silicate glass samples. The initial crack network is introduced through a thermal shock (the sample is slowly heated up to 300°C and then it is quenched into water at ambient temperature). The creep tests are performed by increasing the axial stress step by step (at constant confining pressure, temperature and pore fluid pressure). Results show that during creep tests, dilatancy is observed. This is not the case for regular triaxial test. The dilatancy is correlated to a non-zero acoustic emission rate that is evidenced by the sub-critical crack propagation. This crack growth induced localized failures. In addition, increasing temperature increases the strain rate and reduces the time to rupture. The different experiments performed at different temperatures allow to determine the activation energy (32 KJ/mol). The effect of confining pressure and differential stress is also investigated in order to extrapolate to long time scales, as in storage conditions.

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/content/papers/10.3997/2214-4609.20141078
2014-06-16
2024-03-28
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References

  1. Bhat, H., Sammis, C. and Rosakis, A.
    [2011] The micromechanics of Westerly granite at large compressive loads. Pure and Applied Geophysics, 168(12), 2181–2198.
    [Google Scholar]
  2. Heap, M., Baud, P., Meredith, P., Bell, A. and Main, I.
    [2009] Time-dependent brittle creep in darley dale sandstone. Journal of Geophysical Research, 114(B7), doi: 10.1029/2008JB006212.
    https://doi.org/10.1029/2008JB006212 [Google Scholar]
  3. Lawn, B.
    [1975] Fracture of Brittle Solids. Cambridge University press.
    [Google Scholar]
  4. Mallet, C., Fortin, J., Guéguen, Y. and Bouyer, F.
    [2013] Effective elastic properties of cracked solids: an experimental check. International Journal of Fracture, doi: 10.1007_s10704‑013‑9855‑y.
    https://doi.org/10.1007_s10704-013-9855-y [Google Scholar]
  5. Ougier-Simonin, A., Fortin, J., Guéguen, Y., Schubnel, A. and Bouyer, F.
    [2010] Crack in glass under triaxial conditions. International Journal of Engineering Science, 49(1), 105–121.
    [Google Scholar]
  6. Ougier-Simonin, A., Guéguen, Y., Fortin, J., Schubnel, A. and Bouyer, F.
    [2011] Permeability and elastic properties of cracked glass under pressure. JGR, doi: 10.1029/2010JB008077.
    https://doi.org/10.1029/2010JB008077 [Google Scholar]
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