On the Adhesive Contact between a Soft Elastic Sphere and a Rigid Half-Space

In the adhesive contact between a sphere and a half-space, there are three famous models: JKR, DMT and Maugis models. The JKR applies for soft spheres. The DMT applies for rigid spheres. The Maugis model applies for the transition from JKR to DMT models. In simulations, numerical simulation, finite element analysis and molecular dynamics simulation are used widely. Among these methods, the JKR, Maugis models and numerical simulation use small deformation. These methods reach the same conclusion for the adhesive contact for soft spheres. Recently, some finite element analyses and molecular dynamics simulation found that, under large deformation, the results are different from those from the JKR, Maugis models and numerical simulation. Therefore, this research will investigate the adhesive contact for soft spheres under large deformation. In this research, Lennard-Jones potential can be used to describe the potential between two molecules. Using the surface integration, the interaction between two bodies can be obtained. Using large deformation analyses, the adhesive contact can be obtained. Then, compare the pull-off force, contact area-load relationship and force distribution with the JKR, Maugis model and numerical simulation. In this research, the software 'abaqus' is used. The Lennard-Jones potential will be described by user subroutine. Since it is time-consuming for the cases with large Tabor parameters, python script with remeshing program will be used. The result will make import contributions in the basic theories of adhesive contact.

Project ID:PB10007-0373
External Project ID:NSC100-2221-E182-032