1.6.19 Contact surface extensions

Product: ABAQUS/Standard

Elements tested

C3D8 C3D10 C3D20 CPE3 CPE4 CPE6 CPE8 ISL21A ISL22A

Features tested

Contact surface and slide line extensions for small- and finite-sliding.

Problem description

In small-sliding contact extending the master surface allows the slave node to find an intersection with the master surface when the slave node lies slightly outside the perimeter of the master surface at the start of the analysis. The small-sliding models consist of a stacked block arrangement in which the nodes of the slave surface extend beyond the perimeter of the master surface at the start of the analysis.

In finite-sliding contact extending the master surface can prevent nodes from “falling-off” or getting trapped behind the master surface. The finite-sliding models are similar to the small-sliding models, except that the slave surface lies within the perimeter of the master surface at the start of the analysis. A second step moves the slave surface beyond the perimeter of the master surface but within the extension zone.

Material:

Young's modulus	3.0 × 10⁶
Poisson's ratio	0.2

Results and discussion

The small-sliding tests verify that an intersection is found and that the proper contact clearance is calculated at the start of an analysis.

The contact clearances, slip distances, and contact pressures are used to verify the finite-sliding results when a slave node enters the extension region.