# Universal features in "stickiness" criteria for soft adhesion with rough surfaces

## TL;DR

This paper shows that various stickiness criteria for soft adhesion on rough surfaces, based on energy and macroscopic quantities, are remarkably consistent, indicating universal features in adhesion behavior.

## Contribution

The paper demonstrates that different theoretical criteria for soft adhesion on rough surfaces yield similar results, highlighting universal features and the dominance of macroscopic quantities.

## Key findings

- Different criteria produce very close stickiness predictions.
- Stickiness depends mainly on macroscopic quantities.
- Energy-based and BAM models align closely in predictions.

## Abstract

A very interesting recent paper by Dalvi et al. has demonstrated convincingly with adhesion experiments of a soft material with a hard rough material that the simple energy idea of Persson and Tosatti works reasonably well, namely the reduction in apparent work of adhesion is equal to the energy required to achieve conformal contact. We demonstrate here that, in terms of a stickiness criterion, this is extremely close to a criterion we derive from BAM (Bearing Area Model) of Ciavarella, and not very far from that of Violano et al. It is rather surprising that all these criteria give very close results and this also confirms stickiness to be mainly dependent on macroscopic quantities.