Adhesion has been demonstrated to play an important role in contact and friction between objects at small scales. While various models have been established for adhesive contact under normal forces, studies on the adh...Adhesion has been demonstrated to play an important role in contact and friction between objects at small scales. While various models have been established for adhesive contact under normal forces, studies on the adhesive contact under tangential force have been far fewer, which if any, are mostly confined to the non-slipping situations. In the present work, a model has been proposed for adhesive contact with local sliding under tangential forces. Herein, the onset of local sliding in adhesive contact has been addressed by assuming the nucleation of dislocations. By analogy with the emission of dislocations at a crack tip, the critical tangential force for the onset of sliding has been determined, and its effect on the evolution of contact size has also been studied. Comparison with relevant experiments has verified the validity of the present model.展开更多
In this paper,the smoothed particle hydrodynamics(SPH)method is employed in modeling and numerical simulation of droplet coalescence.Considering the effect of tangential force on boundary material,besides normal force...In this paper,the smoothed particle hydrodynamics(SPH)method is employed in modeling and numerical simulation of droplet coalescence.Considering the effect of tangential force on boundary material,besides normal force,tangential force is also introduced in the continuum surface force(CSF)model.The formation of droplet,the coalescence processes of two droplets and three droplets are simulated by the modified CSF model.The validity of the modified model is verified from the aspects of the morphological change of the droplet,the smoothness of free surface and the conservation of the centroid of the system.Compared with finite element method,the results of the modified CSF model show that tangential force plays a crucial role in the CSF model when dealing with model boundary with curves and sharp angles.展开更多
基金supported by the National Key Basic Research Program (No.2012CB937500)Natural Science Foundation of China (No.11572216)
文摘Adhesion has been demonstrated to play an important role in contact and friction between objects at small scales. While various models have been established for adhesive contact under normal forces, studies on the adhesive contact under tangential force have been far fewer, which if any, are mostly confined to the non-slipping situations. In the present work, a model has been proposed for adhesive contact with local sliding under tangential forces. Herein, the onset of local sliding in adhesive contact has been addressed by assuming the nucleation of dislocations. By analogy with the emission of dislocations at a crack tip, the critical tangential force for the onset of sliding has been determined, and its effect on the evolution of contact size has also been studied. Comparison with relevant experiments has verified the validity of the present model.
文摘In this paper,the smoothed particle hydrodynamics(SPH)method is employed in modeling and numerical simulation of droplet coalescence.Considering the effect of tangential force on boundary material,besides normal force,tangential force is also introduced in the continuum surface force(CSF)model.The formation of droplet,the coalescence processes of two droplets and three droplets are simulated by the modified CSF model.The validity of the modified model is verified from the aspects of the morphological change of the droplet,the smoothness of free surface and the conservation of the centroid of the system.Compared with finite element method,the results of the modified CSF model show that tangential force plays a crucial role in the CSF model when dealing with model boundary with curves and sharp angles.
