Introduction

*CONSTRAINED_LINEAR
Linearly Constrained Plate
LS-DYNA Manual Section: *CONSTRAINED_LINEAR

Additional Sections:
BOUNDARY_PRESCRIBED_MOTION_NODE
DEFINE_CURVE

Example: Linearly Constrained Plate

Filename: constrained.linear.plate.k

Description:
The center node of a plate moves in the normal direction. Two other nodes that
are neighbors to the center node are constrained such that their displacement
in the normal direction is identical.

Model:
The plate is made of an elastic material measuring 40 * 4 0* 2 mm3 and contains
64 Hughes-Liu shell elements. The center node displacement increases linearly.
At the termination time, 0.0005 seconds, the displacement is 15 mm. The degree
of freedom in the z-direction for the two nodes is identical.

Input:
A load curve defines the ma gnitude of the prescribed displacement of the
center node (*BOUNDARY_PRESCRIBED_MOTION_NODE, *DE FINE_CURVE). A linear
constraint card defines the coupling of the displacement in the z -direction
between the two nodes (*CONSTRA INED_LINEAR). Two equal coefficients with
opposite signs control the displacement.

Reference:
Schweizerhof, K. and Weimar, K.