This article concentrates on the influence of roughness on the detachment force of elastic films on self-affine rough surfaces. It is shown that the self-affine roughness at the junction of an elastic film and a hard solid substrate influences its detachment force in a way that the detachment force can be smaller than that of a flat surface for relatively high elastic modulus E depending also on the specific roughness details. For rougher surfaces the effect of elastic energy becomes more dominant with increasing ratio between the roughness amplitude and the roughness correlation length along the interface (w/xi). The detachment force shows a maximum after which it decreases and becomes even lower than that of a flat surface. Similar is the case of partial contact where the detachment force also increases as the contact length increases up to a maximum (for contact lengths larger than the roughness correlation length xi), and further decreases followed by saturation.
- HEIGHT-HEIGHT CORRELATION