ABAQUS Keywords Reference Manual  

*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:

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.

Data line to define the mass magnitude: 

First (and only) line:

  1. Mass magnitude. Mass, not weight, should be given.

ABAQUS does not use any specific physical units, so the user's choice must be consistent.