# OS-E: 0205 Car Bumper Impact

The bumper is one of the main parts which are used as protection for passengers from front and rear collision. Impact analysis (front bumper) using Nonlinear Transient Dynamic Solution in OptiStruct is demonstrated.

## Model Files

Refer to Access the Model Files to download the required model file(s).

The model file used in this example includes:

Bumper_OS_Impact.fem

## Model Description

A car bumper, modeled using first order shell elements and which is constrained in all DOF’s at the mounting locations. The stopper/impactor is rigid body first order shell elements + RBE2 with added mass for the inertia effect, which is then constrained in all DOF’s except X-translation. Sliding Contact is defined between the surfaces of the bumper (area in contact with the stopper during impact) and for the stopper surface. The initial velocity (applied on the stopper) of -694.44mm/s is applied.

**Shell and Rigid Elements**- Bumper
- First order Shell
- Stopper
- First order Shell with RBE2

**Bumper**- Young's Modulus
- 2800 MPa
- Poisson's Ratio
- 0.3
- Initial Density
- 1.2e-9 ton/mm
^{3}

**Stopper**- Young's Modulus
- 2100000 MPa
- Poisson's Ratio
- 0.3
- Initial Density
- 7.82e-9 ton/mm
^{3}