PLOADSF

Bulk Data Entry Parameters of pressure loads on a surface defined by a SURF/SET entry.

The SURF format of type ELFACE and the SURF/SET format of type ELEM are supported.

Format A

Pressure normal to local element surfaces (Type = NORMAL)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PLOADSF SID SRFID Type P          

Format B

Hydrostatic pressure (Type = HYDRO)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PLOADSF SID SRFID Type P1 CID Z0 Z1    

Format C

Directional surface traction (Type = DIREC) and Shear surface traction (Type = SHEAR)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
PLOADSF SID SRFID Type P CID N1 N2 N3  

Definitions

Field Contents SI Unit Example
SID Load set identification number.

No default (Integer > 0)

  
SRFID Surface identication number.

No default (Integer > 0)

  
Type Pressure type applied.
NORMAL (Default)
Pressure normal to local element surfaces.
DIREC
Directional surface traction.
HYDRO
Hydrostatic pressure.
SHEAR
Shear surface traction.

(Character)

  
P Constant pressure magnitude.

No default (Real)

  
P1 Hydrostatic pressure magnitude at Z1. 4

No default (Real)

  
CID Coordinate system identification number.
0 or blank
Identifies the basic coordinate system. Spherical coordinate systems are invalid for type HYDRO.

Default = 0 (Integer > 0, or blank)

  
ZO, Z1 Z-coordinates (in the user specified coordinate system) of the zero-pressure level and the level at which the hydrostatic pressure P1 is defined. 4

If the basic coordinate system is used in axisymmetric analysis defined in xz- and xy- planes, Z0 and Z1 specify values of the z- and y-coordinate, respectively.

No default (Real)

  
N1, N2, N3 Components of a vector measured in the user specified coordinate system. The vector is normalised internally such that it does not contribute to the magnitude of the load.

For Type DIREC, the vector defines the direction of the load.

For Type SHEAR, the projection of the vector on local element surfaces gives the direction of the shear traction. If the vector is perpendicular to the face of an element, the corresponding shear pressure will be set to 0.

Default = 0 (Real)

  

Comments

  1. Only the SURF entries of type ELFACE and the SURF/SET entries of type ELEM are supported.
  2. The magnitude of surface tractions of types NORMAL, DIREC and SHEAR is assumed be constant.
  3. The direction for surface tractions of types NORMAL and HYDRO is consistent with the normal direction of the referenced surface.
  4. The magnitude of the hydrostatic pressure, i.e. Type = HYDRO, varies linearly between Z0 and Z1 and vanishes above Z0, where Z0 is defined as the zero-pressure level and Z1 the level at which P1 is defined (Figure 1), both measured in the user specified coordinate system.


    Figure 1. Definition of the Hydrostatic Pressure
  5. Only the complete follower option, i.e. FLLWER = 1, is provided for the hydrostatic pressure of type HYDRO, and other options (FLLWER = 2 and 3) will be converted internally if specified. For types NORMAL, DIREC and SHEAR, all the follower options are supported.