*VARIABLE MASS SCALING
21.1 *VARIABLEMASS SCALING: Specify mass scaling during the step.
This option is used to specify mass scaling during the step for part or all o f the model.
Product: ABAQUS/Explicit
Type: History data
Level: Step
References:
•“Mass scaling,” Section 11.7.1of the ABAQUS Analysis User ’sManual
•“Output,” Section 4.1.1 of the ABAQUS Analysis User ’sManual
Optional parameters:
DT
Set this parameter equal to the desired element stable time increment for the element set provided.
The mass scaling is applied according to the method specified with the TYPE parameter. If the DT
parameter is omitted, all variable mass scaling definitionsfrom previous steps are removed, and the
scaled mass matrix from the end of the previous step is carried over to the current step.
ELSET
Set this parameter equal to the name of the element set for which this mass scaling definition is
being applied. If this parameter is om itted, the mass scaling definition will apply to all elements in
the model.
The *VARIABLEMASS SCALING option can be repeated with different ELSET definitions
to define different mass scaling for the specified element sets.
TYPE
Set TYPE=UNIFORM to scale the masses of the elements equally so that the smallest element
stable time increment of the scaled elements equals the valueassigned to DT.
Set TYPE=BELOW MIN (default) to scale the masses of only the elements whose element
stable time increments are less than thevalue assigned to DT. The masses of these elements will be
scaled so that the element stable time increments equal the value assigned to DT.
Set TYPE=SET EQUAL DT to scale the masses of all elements so that they have the same
element stable time increment equal to the value assigned to DT.
SetTYPE=ROLLING to scale the elem ent masses automatically for the simulationof a rolling
process. The appropriate va lue for the target stable time increment is determined by AB AQUS from
several parameters of the rolling process. The DT parameter will be ignored in this case.
21.1–1
ABAQUS Version 6.1 Module: ID:
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