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Table 1 Parameters of the interface model

From: Numerical and experimental investigation of shear strength between the steel tube and cement paste in petroleum wells

Parameter Simulation
  SD NW GP
Normal stiffness of the interface (kn) [N/mm3] 3.800 4.000 2.000
Tangential stiffness of the interface (ks) [N/mm3] 3.800 4.000 2.000
Activation energy in mode II (GoII) [N/mm] 0.140 0.195 0.025
Energy critical mode II (GcII) [N/mm] 0.480 0.950 0.100
Exponent of the power of steering of the damage (N) 2.000 2.500 1.800
Coefficient of friction (μ) 0.470 0.470 0.470
Pressure at the interface (P) [MPa] 4.000 4.500 1.950