Modeling the Viscoelastic Behavior of Quartz and Clay Minerals in Shale by Nanoindentation Creep Tests

Figure 10

Linear regressions for employing the two-dashpot Kelvin model for quartz and clay minerals at various peak loads. Fitting parameters: (a) E₁, (b) E₂, (c) E₃, (d) η₁, and (e) η₂. Error bars are one standard deviation.

(a)

(b)

(c)

(d)

(e)