Introduction

*DEFORMABLE_TO_RIGID
Interaction of Pendulums
LS-DYNA Manual Section: *DEFORMABLE_TO_RIGID

Additional Sections:
*BOUNDARY_SPC_NODE
*LOAD_BODY_Y *RIGID_DEFORMABLE_R2D

Example: Interaction of Pendulums

Filenames: deformable_to_ri gid.pendulum.k
deformable_to_rigid.pendulum.res

Execution lines:
ls940 i= deformable_to_rigid.pendulum.k
ls940 i= deformable_to_rigid.pendulum.res r=d3dump01

Description:
Two spheres are connected to wires to form two pendulums. One sphere is in a
horizontal position with gravitational acceleration, base acceleration and is
given an initial velocity in the vertical direction. The other sphere is in
the vertical direction. The spheres are treated as rigid bodies while no
contact or deformation occurs (i.e., when the horizontal pendulum swings down
towards the vertical pendulum). The spheres are switched to deformable through
a restart file so that they become flexible during contact.

Model:
Both spheres are modeled using shell elements. The pendulum wires are modeled
using elastic beams. Automatic single surface contact is used during the impact
phase.

Reference:
Reid, J.D.