Research Article

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

Table 1

Indentation data related to quartz and minerals in shale.

MineralsPmax (mN)h0 (nm)hmax (nm)Creep depth (nm)Hardness (GPa)Young’s modulus (GPa)
Ave.Std.Ave.Std.Ave.Std.Ave.Std.Ave.Std.

Clay minerals5555.361.2610.556.155.15.60.670.1225.644.41
10714.827.1789.130.974.311.50.820.0526.847.79
301192.787.21299.082.1106.311.60.920.1725.072.14
501580.271.11720.662.9140.429.40.800.0633.970.62
Quartz5156.83.6170.54.813.71.311.720.3893.154.05
10240.51.2255.51.815.11.111.400.0686.081.64
30428.11.8455.92.927.82.011.930.4789.481.84
50574.63.4604.95.930.32.712.370.2584.081.42

Pmax: peak load; h0: the indentation depth at the beginning of hold time; hmax: maximum indentation depth.