Viscoelastic-Viscoplastic Modelling of the Scratch Response of PMMA

Table 2

Parameters of the Kelvin-Voigt viscoelastic model.

𝐹𝑛 in mN	𝐸1 in MPa	𝐸2 in MPa	𝜂 in GPa⋅s^−1
20	3250	3750	300
40	3000	3500	500
80	2750	3250	700