OS-V: 0240 3D Steel Roller on Rubber

Contacts Benchmark 3For Quasi-static analysis using Linear elastic material, geometric non-linearity and nonlinear boundary conditions.

OptiStruct FE results examine the horizontal displacement of the point A after 360 degrees’ motion. OptiStruct also examines the 3D deformable-deformable contact, Rolling contact and Incompressible material feature.


Figure 1.

Benchmark Model

Hexa8 elements are used to create one half of the model. The Steel is of 20mm width and 30mm radius, the rubber mat is 22mm wide, 20mm in high and 360mm long. The steel roller starts rolling from a point 60mm from the left-hand side of the rubber mat. The center of the roller is fixed in horizontal and vertical direction, for a time period of 0-1 second the bottom surface of the rubber is displaced 3mm in the negative y direction, the sheet x-displacement is fixed and there is no roller rotation. For the time period of 1-2 second the bottom surface of the rubber sheet is held at 3mm y-displacement and rotation of 360 degrees is prescribed to the steel roller where the sheet is free to move in horizontal direction. There is no force applied on the system and the coefficient of friction between the two surface is 0.3. The nodes on the outer surface of the roll are selected as main nodes, while the nodes on the top surface of the mat are specified as the secondary nodes.

The material properties are:
Esteel
210 kN/mm2
Nsteel
0.3
C10, rubber
10 N/mm2 (Neo Hookean material description)
D1rubber
0.0001

Nonlinear Static Analysis Results

Horizontal Displacement (mm) NAFEMS OptiStruct Normalized
3D first order elements 182.9 182.06 1.00461386


Figure 2. Vertical Forces on the Roller versus Time


Figure 3. 3D Analysis – Undeformed and Contour Plots of Contact Pressure on Deformed Structure

Model Files

The model files used in this problem include:

<install_directory>/hwsolvers/demos/optistruct/verification/contb5H8.fem

Reference

NAFEMS Ltd, The Standard NAFEMS BENCHMARKS TNSB Rev. 3, NAFEMS Ltd, Scottish Enterprise Technology Park, Whitworth Building, East Kilbride, Glasgow, United Kingdom, 1990.