Abstract
Nanoindentation pop-ins in composite source shale were characterized as Type I and Type II, where the slopes on load–displacement (p–h) curves are defined as Δp/Δh = 0 or Δp/Δh > 0, respectively. Type I were associated with sudden instantaneous failure as elastic perfectly plastic “Coulomb-type” and sudden grain dislodging, while Type II were related to shear band progressive failure and/or grain sliding or progressive pile-up. Pop-ins were primarily observed when indenting perpendicular to the shale layers. Estimating magnitudes of pop-in energy dissipation varied widely with shale matrix phases. Meanwhile, Type III pop-ins defined by Δp/Δh < 0, were never observed.
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The authors wish to thank Jordan Kone for assistance with SEM imaging.
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Hull, K.L., Abousleiman, Y.N. SEM analysis of pop-ins manifested in layered porous geological material. MRS Communications 11, 747–754 (2021). https://doi.org/10.1557/s43579-021-00102-3
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DOI: https://doi.org/10.1557/s43579-021-00102-3