ABAQUS Volume II: I–Z - Manual (Page 303)

*PRESSURE STRESS
16.25 *PRESSURE STRESS: Specify equivalent pressure stress as a predefined field for a
mass diffusion analysis.
This option can be used only in a *MASS DIFFUSION analysis to specify pressure as a predefined field. The
user defines equivalent pressure stresses at the nodes, and ABAQUS/Standard interpolates the pressure to the
material points.
Product: ABAQUS/Standard
Type: History data
Level: Step
References:
•
“Mass diffusion analysis,” Section 6.8.1 of the ABAQUS Analysis User’s Manual
•
“Predefined fields,” Section 27.6.1 of the ABAQUS Analysis User’s Manual
Optional parameters for using the data line format:
AMPLITUDE
Set this parameter equal to the name of the amplitude curve that gives the time variation of the
pressure throughout the step. If the AMPLITUDE parameter is omitted, the reference magnitude is
applied either immediately at the beginning of the step or linearly over the step, depending on the
value assigned to the AMPLITUDE parameter on the *STEP option (see “Procedures: overview,”
Section 6.1.1 of the ABAQUS Analysis User’s Manual).
INPUT
Set this parameter equal to the name of the alternate input file containing the data lines for this
option. See “Input syntax rules,” Section 1.2.1 of the ABAQUS Analysis User’s Manual, for the
syntax of such file names. If this parameter is omitted, it is assumed that the data follow the keyword
line.
OP
Set OP=MOD (default) for existing *PRESSURE STRESS values to remain, with this option
modifying existing values or defining additional values.
Set OP=NEW if all existing *PRESSURE STRESS values should be removed. New pressure
stress values can be defined.
A pressure that is removed via OP=NEW is reset to the value given on the *INITIAL
CONDITIONS option or to zero if no initial pressure was defined. If pressures are being returned
to their initial condition values, the AMPLITUDE parameter described above does not apply.
Rather, the AMPLITUDE parameter given on the *STEP option governs the behavior. If pressures
16.25–1
ABAQUS Version 6.1 Module: ID:
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