论文标题
在粘弹性接触中的长距离粘合剂相互作用上
On the long and short-range adhesive interactions in viscoelastic contacts
论文作者
论文摘要
最近，摩擦学家表明，在粘弹性骨折中发生的速率依赖现象的利息日益增加。但是，在某些情况下，尽管使用了类似的理论模型，但仍获得了冲突的结果。因此，我们试图通过利用最近开发的数值模型来阐明长距离粘附对粘弹性介质接触中的引起力的影响。我们发现，在远距离粘附的极限上，卸载速度对拉的力的影响很小，该速度接近布拉德利（Bradley）对刚体预测的值。在这种情况下，脱离过程的特征是接触区域的键键键键合，粘性耗散涉及大量材料。对于培养基（短）范围的粘附，拉动力是拉动速度的单调增加功能，并且在高速下达到了一个高原，这是绝热表面能量的函数。在这种情况下，分离过程类似于圆形裂缝的开口，粘性耗散位于接触边缘。
Recently, tribologists have shown increasing interest in rate-dependent phenomena occurring in viscoelastic fractures. However, in some cases, conflicting results are obtained despite the use of similar theoretical models. For this reason, we try to shed light on the effects that long and short-range adhesion has on the pull-off force in the contact of viscoelastic media by exploiting a recently developed numerical model. We find that, in the limit of long-range adhesion, the unloading velocity has little effect on the pull-off force, which is close to the value predicted by Bradley for rigid bodies. In such case, the detachment process is characterized by a uniform bond-breaking of the contact area, and viscous dissipation involves the bulk material. For medium(short)-range adhesion, the pull-off force is instead a monotonic increasing function of the pulling velocity and, at high speeds, reaches a plateau that is a function of the adiabatic surface energy. In this case, the detachment process is similar to the opening of a circular crack, and viscous dissipation is localized at the contact edge.
