Conctact with tension or pressure

1

Hello,

is it possible,
to have contact with pressure and without shearing force
and
to have contact with tension and shearing force?

wbr & thnx

2

GAPUNI elements (so basically nonlinear springs with special definition) can be used to model contact in one direction with possibility for compression-only or tension-only behavior. Abaqus offers additional types of GAP elements, CalculiX supports only GAPUNI ones.

3

In addition to discussion, seems a Gap element in CalculiX and Abaqus is slightly different, but may be only minor to previous version.

Abaqus input format,
*ELSET Set this parameter equal to the name of the element set containing the GAP-type contact elements for which properties are being defined.
Data line for GAPUNI and GAPUNIT elements:
*initial clearance, d. If the remaining fields are omitted or specified as zero, the contact direction will be computed from the nodal coordinates.
*Global X-direction cosine of the contact direction.
*Global Y-direction cosine of the contact direction.
*Global Z-direction cosine of the contact direction.
*Element cross-sectional area.

CalculiX input format,
(Version 2.7)

  • Enter the ELSET parameter and its value.
  • gap clearance
  • first component of the normalized gap direction
  • second component of the normalized gap direction
  • third component of the normalized gap direction

(Version 2.18)

  • Enter the ELSET parameter and its value.
  • gap clearance
  • first component of the normalized gap direction
  • second component of the normalized gap direction
  • third component of the normalized gap direction
  • spring stiffness (default 10^{12 [force]/[length])
  • tensile force at ~infinity (default 10^{-3) [force]).

CalculiX implementation took advantages of spring stiffness adjustment, given the possibility the user to setting.

1 Like
4

Contact with pressure but without shearing forces sounds like frictionless sliding contact. Maybe this is what you are looking for: *TIE for only 1 DoF - #7 by OliverKunc