# OS-V: 1210 Contact with Friction

A deformable block is slid over a fixed rigid plate using enforced velocities and the problem is solved using an explicit dynamic analysis in OptiStruct. The results from OptiStruct are compared with an equivalent model in Radioss.

## Model Files

## Benchmark Model

The finite element model consists of a deformable block on which enforced velocities are applied causing it to slide over a rigid fixed block.

Both blocks are meshed with first-order CHEXA elements and frictional contact is defined between the blocks with a friction coefficient of 0.05. The bottom block is constrained in all directions. One side of the top block is constrained along the Y direction, while the opposite side is subjected to an enforced velocity and constrained along the X, Y, and Z rotational degrees of freedom. The upper side of the top block is subjected to an enforced velocity and is constrained along the X, Y, and Z rotational degrees of freedom.

The Y and Z directional velocities are applied in the form of a sinusoidal variation as a function of time ( $t$ ) given by:

Direction | ${V}_{m}$ | $T$ |
---|---|---|

Y | 565 mm/s | 0.009 s |

Z | -102 mm/s | 0.001 s |

**Property****Value**- Elastic modulus
- 193000 N/mm
^{2} - Poisson’s ratio
- 0.3
- Density
- 7.75 E-09 tonn/mm
^{3}