RD-HWX-T: 1020 Front Impact Bumper Model

This tutorial demonstrates how to find deformation, stress, and energy absorbing capacity of various structural components of a vehicle hitting a stationary or moving object.

The component is crashworthy (safe), if it meets the plastic strain and energy targets.

A bumper beam is one of the components that is used to protect passengers from front and rear collision.

Bumper beam crash tests are necessary, for instance to calculate the energy absorption of this component during a crash.

Figure 1.
In this lesson you will learn to:
  • Step 1: Load the Radioss (Block) interface and load initial solver deck
  • Step 2: Global de-penetration
  • Step 3: Define material and failure
  • Step 4: Define property
  • Step 5: Define spotwelds
  • Step 6: Mirroring model
  • Step 7: Set contact
  • Step 8: Define rigid body
  • Step 9: Define boundary condition
  • Step 10: Define loading (gravity / initial velocity)
  • Step 11: Create rigid wall
  • Step 12: Create accelerometer
  • Step 13: Define section
  • Step 14: Model check
  • Step 15: Define output (time history / anim)
  • Step 16: Create Engine setup and export the model
  • Step 17: Run the model and check the results

Model Description

  • UNITS: Length (mm), Time (ms), Mass (kg), Force (kN) and Stress (GPa)
  • Simulation time: [0 – 100.0]
  • Boundary Conditions: Gravity load, initial velocity of -5.0 m/s of the bumper beam on the rigid wall
  • /MAT/LAW2 (PLAS_JOHNS): for bumper parts and crash box parts
  • /PROP/TYPE1 (SHELL): for bumper beam parts and crash box parts
  • /INTER/TYPE2: for tied interface that connects a set of secondary nodes to a main surface (connect coarse and fine meshes, model spotwelds, rivets, and so on)
  • /INTER/TYPE7: Penalty contact between all versus all
  • /FAIL/BIQUAD: model failure


To run this simulation, you will need access to a licensed version of Radioss. You will need an internet connection to watch the video tutorials and download the files.

Model Files

Before you begin, copy the file(s) used in this tutorial to your working directory.

Tutorial Video