A preliminary contact analysis was first run with the original mesh density prescribed to the bearing, then the elements that were in contact with the femoral component were further refined for the subsequent solution. An example of this mesh is depicted in the figure on the right.
The graphic below illustrates the stress distribution in contact area between the bearing and the femoral component. These stress distribution plots can be created in the ANSYS program for any point in time during the nonlinear solution.
It was found that excessive geometric penetration at setup produced stress singularities and, therefore, the contact pair should be checked prior to the solution. Localised peak contact stresses could also be produced by the discretisation of the otherwise smooth contact surfaces. The mesh refinement level for the elements in the vicinity of contact after the preliminary contact analysis may be increased, but at the expense of a longer solution time.