3.7 SURFACE/PRESSURE LOADS FILE Z88I5.TXT

Mind the following formats:

[Long] = 4 bytes or 8 bytes integer number

[Double] = 8 bytes floating point number, alternatively with or without point

1st Input group, i.e. the first line contains

number of surface and pressure loads [Long]

2nd Input group, i.e. the second and following lines contain

surface and pressure loads – one line per load. Of course, an element may have more than one load applied.

The following entries depend from the element type with surface and pressure load to avoid unnessesary data entries. Define the the local r and s directions by the nodes and their sequence. These local directions for the surface loads may differ from the local r and s coordinate system of the finite element. The numbering has to conform to the element numbering, see chp. 4. Separate each item by at least one blank.

>> Plain stress element No.7 and 14 and Torus elements No.8 and 15:

Element number with surface load [Long]

Pressure, positive if poiting towards the edge [Double]

Tangential shear, positive in local r-direction [Double]

3 nodes of the loaded edge [3 x Double]

Example: The plain stress element 97 features surface load. The load should be applied onto the edge defined by the corner nodes 5 and 13 and by the mid node 51. One surface load is applied normally to the edge with 100 N/mm and the other surface load is applied tangentially and positive in local r direction with 300 N/mm (defined by the two corner nodes). Thus:

> 97 100. 300. 5 13 51

>> Hexahedron No.1:

Element number with surface and pressure load [Long]

Pressure, positive if poiting towards the surface [Double]

Tangential shear, positive in local r direction [Double]

Tangential shear, positive in local s direction [Double]

4 nodes of the loaded surface [4 x Long]

######

Example: The hexahedron 356 features surface loads. The load should be applied onto the surface defined by the corner nodes 51, 34, 99 and 12 .The first surface load is pressure with 100 N/mm. The second surface load is applied tangentially and positive in local r direction with 200 N/mm. The third surface load is applied tangentially and positive in local s direction with 300 N/mm . Thus

> 356 100. 200. 300. 51 34 99 12

>> Hexahedron No.10:

Element number with surface and pressure load [Long]

Pressure, positive if poiting towards the surface [Double]

Tangential shear, positive in local r direction [Double]

Tangential shear, positive in local s direction [Double]

8 nodes of the loaded surface [8 x Double]

Example: The hexahedron 456 features surface loads. The load should be applied onto the surface defined by the corner nodes 51, 34, 99 and 12 and the mid nodes 102, 151, 166 and 191 .The first surface load is pressure with 100 N/mm. The second surface load is applied tangentially and positive in local r direction with 200 N/mm. The third surface load is applied tangentially and positive in local s direction with 300 N/mm . Thus

> 456 100. 200. 300. 51 34 99 12 102 151 166 191

>> Tetrahedron No.17:

Element number with pressure load [Long]

Pressure, positive if poiting towards the surface [Double]

3 nodes of the loaded surface [3 x Double]

Example: The tetrahedron 356 features surface loads. The load should be applied onto the surface defined by the corner nodes 51, 34 and 12.The surface load is pressure with 100 N/mm pointing towards the surface, i.e. positive. Thus:

> 356 100. 51 34 12

>> Tetrahedron No.16:

Element number with pressure load [Long]

Pressure, positive if poiting towards the surface [Double]

6 nodes of the loaded surface [6 x Double]

Example: The tetrahedron 888 features surface loads. The load should be applied onto the surface defined by the corner nodes 51, 34 and 12 and the mid nodes 65, 66 and 67.The surface load is pressure with 100 N/mm pointing towards the surface, i.e. positive. Thus:

> 888 100. 51 34 12 65 66 67

>> Plate elements No.18, 19 and 20:

Element number with pressure load [Long]

Pressure, positive if poiting towards the surface [Double]

It is easier to enter the pressure loads for plate elements directly into Z88I1.TXT than via Z88I5.TXT