Parameter

Values

Description

RBE2FREE

<YES, NO>

Default = NO

Modeling errors can result in the creation of RBE2 elements with rigid body rotations. This parameter can be used to convert ERROR 725 into WARNING 825 when singular RBE2 elements, with rotational rigid body modes in all three directions, are present in the model.

If YES is specified, ERROR 725 is converted into WARNING 825. For AMSES/AMLS SUBCASEs the free rotational degrees-of-freedom are AUTOSPC’ed. For static analysis and Lanczos eigenvalue analysis, the run may fail due to singularities and ERROR 153 or 155 will be issued.

If NO is specified, ERROR 725 is not converted into WARNING 825 and models containing singular RBE2 elements will error out.

Note:

To solve a problem with Lanczos or static analysis, AMSES can used first to determine which RBE2 degrees-of-freedom are AUTOSPC’ed. Single point constraints (SPC) can be added to manually constrain such degrees-of-freedom in subsequent static analysis or Lanczos eigenvalue analysis.