Introduction

A brief description of the example.
CONTROL_ADAPTIVE
Square Crush Tube with Adaptivity
LS-DYNA Manual Section: *CONTROL_ADAPTIVE

Additional Sections:
*CONTROL_SUBCYCLE

Example: Square Crush Tube with Adaptivity

Filename: control_adaptive.square-beam.k

Description:
A square cross section of a crush tube uses adaptivity to re-fine the mesh as
needed to improve accuracy.

Model:
Only 1/4 of the tube is modeled because of symmetry. The nodes on top of the
crush tube are assigned extra mass with *EL EMENT_MASS and given an initial
velocity in the y direction of -5,646 mm/s. The nodes on the bottom of the
tube are fixed in y-translation. Automatic single surface contact is defined
to prevent penetration when the folds of the crush tube start to form.
The model has sub-cycling defined.

Results:
The mesh at the fold location in the crush tube is automatically re-fined as
the crush progresses.