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The rigid material type provides a convenient way of turning
one or more parts composed of beams, shells, or solid elements
into a rigid body. Each rigid body as a whole has six rigid
body degrees of freedom. Consequently, the elements that
are part of a rigid body are bypassed in the element processing.
The inertial properties of rigid bodies are usually calculated
from the geometry of the constituent elements of the rigid
body and the density specified for the part.
The Young's modulus and the Poisson's ratio are used only
for contact analysis.
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