Contact with initial overclosure of curved surfaces

Elements tested

C3D8

C3D8R

CPS4

CPS4R

Features tested

Contact damping

Contact pair

Modified contact pressure-overclosure relationship

Problem description

The model consists of two concentric rings with a small initial overclosure. In Abaqus/Standard the initial overclosure is resolved during a static step. In Abaqus/Explicit the initial overclosure is resolved during the first step of a dynamic simulation.

The two-dimensional model consists of two 16-element rings, and the three-dimensional model consists of two 32-element rings. The elements of the inner and outer rings are perfectly aligned.

Material:


Young's modulus	206800
Poisson's ratio	0.32
Density	8.01 × 10⁻⁶
Interface friction coefficient	0.0

Results and discussion

The interference is resolved for models using hard contact. In the case of softened contact the interference is reduced until equilibrium is reached; any residual overclosure at the end of the step can be reduced by increasing the stiffness of the pressure-overclosure relationship.

Input files

Abaqus/Standard input files

ei24siso.inp: CPS4 elements, small-sliding.
ei24siso_surf.inp: CPS4 elements, small-sliding, surface-to-surface constraint enforcement method.
ei24ssso.inp: CPS4 elements, finite-sliding, CONTACT INTERFERENCE with SHRINK.
ei38siso.inp: C3D8 elements, small-sliding.
ei38siso_surf.inp: C3D8 elements, small-sliding, surface-to-surface constraint enforcement method.
ei34sfso.inp: C3D8 elements, finite-sliding.
ei34sfso_1.inp: C3D8 elements, finite-sliding with HCRIT and SMOOTH parameters.
ei34sfso_2.inp: C3D8 elements, finite-sliding, SURFACE BEHAVIOR with NO SEPARATION.
ei34sfso_3.inp: C3D8 elements, finite-sliding, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=EXPONENTIAL.
ei34sfso_4.inp: C3D8 elements, finite-sliding, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR.
ei34sfso_5.inp: C3D8 elements, finite-sliding, CONTACT DAMPING with DEFINITION=DAMPING COEFFICIENT.

Abaqus/Explicit input files

interference2d_xpl_finite.inp: CPS4R elements, finite-sliding kinematic contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR.
interference2d_xpl_finite_pnlty.inp: CPS4R elements, finite-sliding penalty contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR.
interference3d_xpl_finite.inp: C3D8R elements, finite-sliding kinematic contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR.
interference3d_xpl_finite_pnlty.inp: C3D8R elements, finite-sliding penalty contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR.
interference3d_xpl_finite_c3d8.inp: C3D8 elements, finite-sliding kinematic contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR.
interference3d_xpl_finite_pnlty_c3d8.inp: C3D8 elements, finite-sliding penalty contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR.
interference3d_xpl_nosep_cdf.inp: C3D8R elements, finite-sliding kinematic contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR and NO SEPARATION, CONTACT DAMPING with DEFINITION=CRITICAL DAMPING FRACTION.
interference3d_xpl_nosep_dc.inp: C3D8R elements, finite-sliding kinematic contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR and NO SEPARATION, CONTACT DAMPING with DEFINITION=DAMPING COEFFICIENT.
interference3d_xpl_small.inp: C3D8R elements, small-sliding kinematic contact, SURFACE BEHAVIOR with PRESSURE-OVERCLOSURE=TABULAR.