Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

Oasys LS-DYNA Environment: User Guide (Version 8.1)
LS-DYNA Manual Section: *DEFORMABLE_TO_RIGID
Additional maual Sections: *LOAD_BODY_Y
Example of: Interaction of Pendulums
Example Filenames: pendulum_impact.key
pendulum_impact.key01
pendulum_impact.key02
Execution lines: Initial run pendulum_impact.key
Restart 1 pendulum_impact.key01 + pendulum_impact..dpf01
Restart 2 pendulum_impact.key02 + pendulum_impact..dpf02
Description:
Two cubes are connected by bars to a pendulum. One cube is in a horizontal position with
gravitational acceleration, base acceleration. The cubes are treated as rigid bodies while no contact
or deformation occurs. The cubes are flexible during contact. Then, the cubes become rigid again.
Model:
Both cubes are modeled as one volume element with side length 10 mm. The elastic material
describes both cubes and the bars. The distance from the middle of the cube to the bearing shaft
is 100 mm. The system is subjected to an acceleration of gravity of 10,000 kg mm/second 2 .
The calculations terminate at 0.5 seconds.
Input:
Base acceleration defines gravity (*LOAD_BODY_Y), which is changed in time by a load curve
(*DEFINE_CURVE). Surface to surface contact type 3 defines the interface between the two cubes
(*CONTACT_SURFACE_TO_SURFACE).
The material definition of the cubes changes to a rigid material in the beginning of the calculations
(*DEFORMABLE_TO_RIGID).
Reference:
Schweizerhof, K. and Weimer, K.
Page A.75