OS-E: 0185 Rubber Ring: Crush and Slide Using Self-Contact

Demonstrates self-contact which is used in this nonlinear large displacement implicit analysis involving hyperelastic material and contacts using OptiStruct.



Figure 1.

Model Description

A deformed rubber ring resting on a flat, rigid surface. Another circular rigid roller rests at the top of the ring, and is in contact with the ring at just a point. Contact is defined between the rigid surfaces and the outside surface of the ring and self-contact is defined in the inside surface of the ring. The loading is applied in two steps – in the first step, the circular roller is pushed down enough to produce self-contact of the inside surface of the ring. In the second step, the roller is simultaneously translated and rotated such that the crushed ring rolls along the flat rigid surface producing a constantly changing region of contact. Here the nonlinear implicit analysis is run.

The FE model solid element properties are:
Rubber Ring
First order solid elements
Shell Elements
Roller
First order shell
Flat Floor
First order shell
The material MAT1 roller and flat floor properties are:
Young’s Modulus
210000 MPa
Poisson's Ratio
0.3
Initial Density
7.9×10-9 ton/mm3
The material MATHE rubber ring properties are:
Poisson's Ratio
0.495
Initial Density
1.1×10-9 ton/mm3
Coefficient of Thermal Expansion
1.7×10-4K-1

Results

Figure 2 shows the deformed shape of the rubber ring after the circular roller is pushed down enough.


Figure 2. Deformed Shape of the Rubber Ring after First Step
Figure 3 shows the slide of the crushed rubber ring along the flat rigid surface after the roller has been simultaneously translated and rotated.


Figure 3. Deformed Shape of the Rubber Ring after Second Step
Figure 4 shows the stresses in the rubber ring after it has been crushed and sliding along the flat rigid surface.


Figure 4. Stress in the Rubber Ring

Model Files

The model files used in this example include:

<install_directory>/hwsolvers/demos/optistruct/examples/rubber_ring.fem