Abstract:
This study is focus on the tangential contact characteristics of a single hemispherical
asperity when the asperity deformed in the stages of normal elastic-plastic deformation
by the finite element method. The normal elastic-plastic contact characteristics
of a single asperity contacted with a rigid flat has been studied by some researchers,
but the tangential contact characteristics of them is still missing in the detail.
The single asperity finite element model is a 3D finite element solid model in
the study of the tangential contact characteristics, it is different the plane
finite element model in the study of the normal contact characteristics. The local
mesh refinement method is applied to mesh the asperity model, within the elastic
deformation of the asperity, the normal contact load and area in the finite element
analysis have been compared with the Hertz contact theory, the difference is less
than 5%, the asperity 3D finite element model has been verified. For tangential
contact analysis, a normal displacement is applied at the pilot node of the rigid
flat, the asperity will deformation from the elastic to plastic range. Then hold
the deformation state, a tangential force is again applied to the pilot node ,
the rigid flat will move on the surface of the asperity in the range of the micro-displacement
state. Under the different normal displacement, the results shows that linear
relationship can be obtained between tangential force and tangential micro-displacement,
in the range of about