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- W2950371572 abstract "Recently, a simple and elegant model was introduced by McMeeking et al. (Adv Eng Mat 12(5), 389-397, 2010) to show a mechanism for a bistable system involving a surface with a shallow depression. The system shows, at least for intermediate levels of stickiness, that external pressure can switch the system into a strong adhesive regime of full contact, or into and complete pull-off, similarly to the contact of surfaces with a single scale of periodical waviness. We add to this model the effect of roughness, in the simple form of axisymmetric single scale of waviness, permitting a very detailed study, and we show that this induces a resistance to jumping into full contact on one hand (limiting the strong adhesion regime), and an enhancement of pull-off and of hysteresis starting from the partial contact state on the other (enhancing the weak adhesion regime). We show the system depends only on two dimensionless parameters, depending on the ratio of work of to the energy to flatten the dimple or waviness, respectively. The system becomes pressure-sensitive also in the intermediate states, as it is observed in real rough systems. The model obviously is specular to the Guduru model of rough spheres (Guduru, JMPS, 55, 473--488, 2007), with which it shares the limitations of the analysis assuming a connected contact (crack) area, and serves also the purpose of showing the effect of a depression into an otherwise periodic rough contact, towards the understanding of with multiple scales of roughness." @default.
- W2950371572 created "2019-06-27" @default.
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- W2950371572 date "2017-01-14" @default.
- W2950371572 modified "2023-09-27" @default.
- W2950371572 title "Adhesion of surfaces with wavy roughness and a shallow depression" @default.
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