3D Connexion Version 6.6

*MASS

13.2 *MASS: Specify a point mass.

This option is used to deﬁne lumped mass values associated with MASS elements.

ForABAQUS/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 theAB AQUS AnalysisUser ’sManual

Required parameter:

ELSET

Set this parameter equal to the name of the element set conta ining the MASS elements for which

the value is being given.

Optional parameters:

ALPHA

This parameter applies only to ABAQUS/Standard analys es.

Set this parameter equal to the factor to create mass proportional damping for the MASS

elements when used in direct-integrationdynam ics. This value is ignored in modal dynamics. The

default is 0.0.

COMPOSITE

This parameter applies only to ABAQUS/Standard analys es.

Set thisparam eter equalto 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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