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PERMAS-CAX Extended Contact Analyses

Migration of rotating loaded ball bearing (from right to left line during one rotation, magnification factor 50)
Migration of outer race of a ball bearing in a housing
by a rotating shaft under constant loading.

This module has been designed for ambitious slip-stick problems and to provide new contact solution algorithms for large contact models (more than 10,000 contact node pairs) in order to essentially accelerate contact analysis runs again (by a factor of 3 and beyond). The module is used as an add-on to module PERMAS-CA (see preceding section).
The functionality comprises the following features:

  • High performance iterative solution algorithms to accelerate standard contact analysis with normal and frictional contact.
  • An additional very stable iteration method for critical slip-stick problems (when all contacts get into sliding state, see figure).

Gasket elements are handled as integral part of the contact iteration through contact controlled nonlinear gasket analysis (CCNG analysis) by default. This leads to a remarkable reduction of run time compared to the classical solution method with nonlinear material behaviour. In particular, this run time reduction will be much higher, when the nonlinear features are contact and gasket elements only. The run time reduction is still significant, if additional nonlinearities are applied.

For sliding friction between dynamically moving parts a velocity field can be prescribed to take it into account in a quasi-static contact analysis (see section Brake Squeal Analysis on page 28). Figure

Conical press-fit
Conical press-fit with all-slipping friction