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PERMAS-CAU Contact Geometry Update

This module has been designed to provide new contact solution algorithms for ambitious slip-stick problems and 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).

In case of large relative displacements of two bodies in contact, the update of the contact properly reflects the change of the relative position of both bodies (s. Fig. 100 and 101).

If very accurate contact results are required, contact updating even reflects very small changes of the contact geometry which gives exact contact forces, displacements, stresses, etc..

The following features are supported by this module:

  • Special modelling is not required. Because the update process changes the position of the contacting surfaces, the contact geometry must be specified by surfaces (e.g. surface-to-surface or surface-to-node). Hence, node-to-node contact and contact to ground are not updated.
  • Contact updating works with and without friction.
  • Contact updating works with linear and nonlinear static analysis. For nonlinear applications, some modelling features are still restricted.

The geometry update is principally explained in Fig. 102. Steps 1 and 2 show the typical contact procedure and steps 3 and 4 show the first iteration of the updating process which will be repeated until a given number of iterations is performed or until a given accuracy is achieved.

nodal stresses
Extraction of a clip using update of contact geometry.
contact normal force
Contact pressure forces during extraction.
contact shear force
Contact frictional forces during extraction.