ABAQUS Volume II: I–Z - Manual (Page 302)

*PRESSURE PENETRATION
OP
Set OP=MOD (default) for existing pressure penetration loads to remain, with this option modifying
existing pressure penetration loads or defining additional pressure penetration loads.
Set OP=NEW if all existing pressure penetration loads applied to the model should be removed.
New pressure penetration loads can be defined.
PENETRATION TIME
Set this parameter equal to a time period over which the fluid pressure on newly penetrated contact
surface segments is ramped up to the current magnitude. The default penetration time period is
chosen to be 0.001 of the current step time. This parameter will be neglected in a linear perturbation
analysis, in which case the current fluid pressure will be applied immediately once the pressure
penetration criterion is satisfied.
Data lines to define the pressure penetration loads:
First line:
1. A node on the slave surface that is exposed to the fluid.
2. A node on the master surface that is exposed to the fluid. This field should be left blank if the
master surface is an analytical rigid surface.
3. Fluid pressure magnitude.
4. Enter the critical contact pressure below which fluid penetration starts to occur. The higher
this value, the easier the fluid penetrates. The default is zero, in which case fluid penetration
occurs only if contact is lost.
Repeat this data line as often as necessary to define fluid penetrations from different locations on the
surface, possibly with different fluid pressure magnitudes. Alternatively, the *PRESSURE PENETRATION
option can be repeated (if, for example, a different amplitude reference is needed).
16.24–2
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