PRESENT VECTORS [Control]

        

This command applies a scale factor to the current loadcase and displays a vector plot to represent both the magnitude and direction of result values.

If no scale factor is specified FEMVIEW will scale the vectors so that the length of the maximum vector, if viewed normal to its length will be approximately 10 mm.

Control Comments

VIEWMODE [factor] See note 6.

All [factor] See note 6.

FACTOR [factor] Works as for VIEWMODE.

factor Works as for VIEWMODE.

Notes:

1.

Scale factor
Where no scale factor is specified, the scale factor calculated by the program is displayed. This should be used as a basis for determining new scale factors.

2.

Colour coding of vectors
On a colour graphics display the vectors can be colour coded according to their magnitude with the command PRESENT OPTIONS VECTORS MODULATE.

3.

Choice of arrowheads
By default, vectors are drawn with 3D arrowheads. The commands PRESENT OPTIONS VECTORS 2DHEADS or PRESENT OPTIONS VECTORS NOHEADS can be used to select other representations of vectors.

4.

Notation for principal stresses
Positive principal stresses are shown by a simple vector and negative principal stresses are denoted by bars at the ends of the vector.

Arrow heads are not drawn with principal stresses and the commands PRESENT OPTIONS VECTORS 2DHEADS, PRESENT OPTIONS VECTORS 3DHEADS and PRESENT OPTIONS VECTORS NOHEADS have no effect.

5.

Simultaneous display of three principal stresses
If principal stresses are to be calculated by FEMVIEW., then the command RESULTS CALCULATE P-STRESS ALL will allow the three principal stresses to be displayed simultaneously.

6.

The `VIEWMODE' and `ALL' controls
If the command PRESENT VECTORS VIEWMODE is used, then only `visible' nodes or elements will have vectors displayed; and this is the default. For a node to be `visible' it must have attached mesh lines shown with the current VIEW command; (VIEW OPTIONS EDGES ALL is assumed, the effect of commands VIEW OPTIONS EDGES OUTLINE and VIEW OPTIONS EDGES INHIBIT is ignored). For a beam or shell element to be `visible', all of its nodes must be `visible'; whereas a solid element is considered `visible' if one or more of its nodes is `visible'. (The exception to this rule is that with models comprising only beam and/or plate/shell elements, the visualisation test is not applied for element labels unless a hidden line view is current).

The command PRESENT VECTORS ALL means that all nodes (or elements) in the current results set will have vectors displayed regardless of `visibility'.

7.

Other controls
Note that further controls and filters on the vectors that are displayed are provided by the RESULTS RANGE command.

Examples:

1.

PRESENT VECTOR FACTOR 100

The scale factor is changed from the default to 100. The visible effect of this depends on the original scale factor.

See also the following commands

'PRESENT OPTIONS SIGNIF'
'PRESENT OPTIONS VECTORS'
'RESULTS RANGE'