Introduction

*DAMPING_GLOBAL
Tire Bounces on the Ground and Damps Out
LS-DYNA Manual Section: *DAMPING_GLOBAL

Additional Sections:
*CONTROL_DAMPING
*LOAD_BODY_Z

Example: Tire Bounces on the Ground and Damps Out

Filename: damping.tire.k

Description:
A simple model of a tire is placed under gravity loading and drops onto rigid
solid elements. Fully integrated shell elements are used for the tire to
prevent hourglassing from damping out the model. Additionally, rigid solid
elements are used for modeling the ground instead of a rigidwall because the
rigidwall will also damp the system because of its' perfectly plastic contact
definition. Thus, to damp out the bouncing, global damping is applied to the
system.

Model:
Global damping of 0.5 is applied to the system using the *D AMPING_GLOBAL
keyword. Contact between the tire and ground is defined using node to surface
contact. Gravity is applied with the *LOAD_BODY_Z command.

Results:
The total energy of the system comes from the external energy of gravity
(potential energy of "mgh"). This energy is absorbed by the damping in the
model.