Blar i forfatter "Pongrac, Petar"

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    • Effect of pressure on the deformation of quartz aggregates in the presence of H2O 

      Nègre, Lucille; Stunitz, Holger; Raimbourg, Hugues; Lee, Amicia; Précigout, Jacques; Pongrac, Petar; Jeřábek, Petr (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-17)
      Quartzite samples of high purity with a grain size of ~200 μm have been experimentally deformed by coaxial shortening in a solid medium apparatus at 900 °C and at confining pressures ranging from 0.6 to 2 GPa. Most samples have been shortened by ~30% with 0.1 wt% added H<sub>2</sub>O. The samples deformed dominantly by crystal plasticity (dislocation creep), and there is a systematic decrease of ...

    • Mechanical properties and recrystallization of quartz in presence of H<inf>2</inf>O: Combination of cracking, subgrain rotation and dissolution-precipitation processes 

      Pongrac, Petar; Jeřábek, Petr; Stunitz, Holger; Raimbourg, Hugues; Heilbronner, Renee; Racek, Martin; Nègre, Lucille (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-21)
      Natural quartzite samples, as-is and with 0.1 wt% of added H<sub>2</sub>O, have been deformed up to ∼30% bulk strain in axial shortening experiments with constant strain rate of ∼10<sup>−6</sup> s<sup>−1</sup> at 900 °C and 1 GPa, and in strain rate stepping ∼10<sup>−5</sup> to ∼10<sup>−7</sup> s<sup>−1</sup> at 900 °C and 1–1.5 GPa, in order to investigate the role of H<sub>2</sub>O in deformation ...