Set this parameter equal to the name of the element set containing the MASS elements for which the value is being given.
Optional parameters
ALPHA
Set this parameter equal to the
factor to create mass proportional damping for the MASS elements when used in direct-integration dynamic analyses, in
mode-based analyses that support nondiagonal damping in
Abaqus/Standard,
and in explicit dynamic analyses. This value is ignored in mode-based analyses
that do not support nondiagonal damping. The default is 0.0.
COMPOSITE
This parameter applies only to
Abaqus/Standard
analyses.
Set this parameter equal to the fraction of critical damping to be used with
the MASS elements when calculating composite damping factors for the modes
when used in mode-based analyses that are not based on the
SIM architecture. The default is 0.0.
For mode-based analyses that are based on the
SIM architecture, the
COMPOSITE MODAL DAMPING option should be used instead. This value is ignored in
direct-integration dynamics.
ORIENTATION
This parameter applies only when TYPE=ANISOTROPIC.
Set this parameter equal to the name of an
ORIENTATION option (Orientations)
that is being used to define the principal directions of the anisotropic mass
tensor. If the ORIENTATION parameter is omitted, it is assumed that the principal
directions coincide with the global axes.
In a large-displacement analysis, the local axes of the anisotropic mass
rotate with the rotation, if active, of the node to which the MASS element is attached.
TYPE
Set TYPE=ISOTROPIC (default) for an isotropic mass tensor.
Set TYPE=ANISOTROPIC for an anisotropic mass tensor with possibly three different
principal values.
Data line to define
the magnitude of an isotropic mass (not weight)
First (and only) line
Mass magnitude.
Abaqus
does not use any specific physical units, so the user's choice must be
consistent.
Data line to define
the three principal values of an anisotropic mass tensor (not
weight)
First (and only)
line
The principal mass about the local 1-axis, .
The principal mass about the local 2-axis, .
The principal mass about the local 3-axis, .
Abaqus
does not use any specific physical units, so the user's choice must be
consistent.