论文标题
在弹性和粘弹性涂层的粗糙接触中探索几何耦合对摩擦和能量耗散的影响
Exploring the effect of geometric coupling on friction and energy dissipation in rough contacts of elastic and viscoelastic coatings
论文作者
论文摘要
我们研究了在界面存在库仑摩擦的情况下，弹性和粘弹性薄涂层的摩擦和粘弹性薄涂层的摩擦行为。目的是探索由材料厚度的有限性产生的正常位移和切向移位场之间的效果，并量化这种贡献对能量损失的贡献。我们发现，由于正常的区域耦合，即使对于纯粹的弹性层，也观察到不对称的接触，因此也观察到了其他摩擦，实际上与零体积的能量耗散有关。此外，在由于耦合引起的粘弹性涂料的情况下，据报道粘弹性摩擦增强，这次还需要更大的体积耗散。几何耦合还引入了涉及较大尺度正常位移的其他相互作用，与未偶联的接触相比，在给定的正常载荷下，接触面积显着增加。这些结果表明，在接触界面的情况下，涉及薄涂层粘合到明显更硬的底物，界面剪切应力对摩擦和接触行为的影响不可忽略。
We study the frictional behavior of both elastic and viscoelastic thin coatings bonded to a seemingly rigid substrate and sliding against a rough profile in the presence of Coulomb friction at the interface. The aim is to explore the effect of the coupling between the normal and tangential displacement fields arising from the finiteness of the material thickness and to quantify the contribution this can have on energy losses. We found that, due to normal-tangential coupling, asymmetric contacts and consequently additional friction are observed even for purely elastic layers, indeed associated with zero bulk energy dissipation. Furthermore, enhanced viscoelastic friction is reported in the case of viscoelastic coatings due to coupling, this time also entailing larger bulk energy dissipation. Geometric coupling also introduces additional interactions involving the larger scales normal displacements, which leads to a significant increase of the contact area, under given normal load, compared to the uncoupled contacts. These results show that, in the case of contact interfaces involving thin deformable coating bonded to significantly stiffer substrate, the effect of interfacial shear stresses on the frictional and contact behavior cannot be neglected.
