This calculator can be used to calculate the adhesion pressure and pull-off pressure between two ealstic rough surfaces (macroscopically flats). The calculator is based on a simplified theory developed by Professor Ciavarella, see details here. Also see the description below according to reference [1]. For more details, contact please Professor Ciavarella mciava@poliba.it.

For a given separation , adhesive pressure  is calculated according to a folowing expression:

.

Here, , , is the roll-off wavelength, with being the work of adhesion and atomic spacing.   is the comined RMS roughness and is the reduced Young’s modulus, are the Poisson and Young’s moduli of the bodies. Pull-off pressure is calculated as the minimum adhesion pressure for all possible separations.

[1] A very simple estimate of adhesion of hard solids with rough surfaces based on a bearing area model, M. Ciavarella, Meccanica, DOI 10.1007/s11012-017-0701-6.