ABAQUS Volume II: I–Z - Manual (Page 129)

*MASS
13.2 *MASS: Specify a point mass.
This option is used to define lumped mass values associated with MASS elements.
For ABAQUS/Standard analyses this option is also used to define mass proportional damping (for direct-
integration dynamic analysis) and composite damping (for modal dynamic analysis) associated with MASS
elements.
Products: ABAQUS/Standard ABAQUS/Explicit
Type: Model data
Level: Part, Part instance, Assembly
Reference:
•
“Point masses,” Section 24.1.1 of the ABAQUS Analysis User’s Manual
Required parameter:
ELSET
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
This parameter applies only to ABAQUS/Standard analyses.
Set this parameter equal to the factor to create mass proportional damping for the MASS
elements when used in direct-integration dynamics. This value is ignored in modal dynamics. 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 modal dynamics. This
value is ignored in direct-integration dynamics. The default is 0.0.
13.2–1
ABAQUS Version 6.1 Module: ID:
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