PRESENT GRAPH PROMPT

      

This command initiates a question and answer sequence which allows the user to generate graphs of variation over loadcases, variation along a line, and variation of one results attribute with respect to another.

Firstly, the user will be prompted to specify the X-axis of the graph. This will determine what sort of graph will be drawn.

Choice Comments

LOADCASES The graph will be of results at a node or element against loadcases, as in PRESENT GRAPH ELEMENT or PRESENT GRAPH NODE.

DISTANCE The graph will be of results against distance along a line through the model, as in PRESENT GRAPH LINE.

RESULTS The graph will be of one results attribute against another, as in PRESENT GRAPH RESULTS.

If LOADCASES is selected then the user will be prompted to specify which loadcases are to be graphed over. The user will then be prompted to enter the number of Y-axis results attributes that are to be superimposed on the graph, followed by the definition of each one. Finally the user will be prompted to specify which node(s) (if the results are nodal) or element(s) (if the results are element) the results are to be taken from. The choices here are the same as in PRESENT GRAPH ELEMENT/NODE.

If DISTANCE is selected then the user will be prompted to define the line(s) along which results variation is to be plotted. The choices here are the same as in PRESENT GRAPH LINE. The user will then be prompted to enter the number of Y-axis results attributes that are to be superimposed on the graph, followed by the definition of each one. Finally the user will be asked to specify the loadcase(s) that the results are to be taken from.

If RESULTS is selected then the user will be prompted to specify the X-axis results attribute. The user will then be prompted to enter the number of Y-axis results attributes that are to be superimposed on the graph, followed by the definition of each one. The user will then be prompted to select what they want to graph over, i.e. whether they want values to be plotted over LOADCASES for a given node/element, or plotted at the nodes/elements in the specified LINE(S) for a given loadcase. If LOADCASES is selected here, then the user will receive the same prompts as if they had chosen LOADCASES at the first prompt, except for those relating to the Y-axis attribute(s). If LINE(S) is selected here, then the user will receive the same prompts as if they had chosen DISTANCE at the first prompt, except for those relating to the Y-axis attribute(s).

Examples:

1.

PRESENT GRAPH PROMPT

  SPECIFY X-AXIS =>  LOADCASES
  FOR WHICH LOADCASES =>  ALL
  NUMBER OF Y-AXIS ATTRIBUTES =>  2
  Y-AXIS ATTRIBUTE =>  NODAL STRESS S11
  Y-AXIS ATTRIBUTE =>  NODAL STRAIN E11
  FOR WHICH NODE(S) =>  1

A graph of NODAL STRESS S11 and NODAL STRAIN E11 at node 1 against all loadcases is drawn.

2.

PRESENT GRAPH PROMPT

  SPECIFY X-AXIS =>  DISTANCE
  FOR WHICH LINE(S) =>  side top
  NUMBER OF Y-AXIS ATTRIBUTES =>  1
  Y-AXIS ATTRIBUTE =>  NODAL TEMP
  FOR WHICH LOADCASE(S) =>  HEAT1 HEAT2

A graph of NODAL TEMP against distance along the lines `side' and `top' for loadcases HEAT1 and HEAT2 is drawn.

3.

PRESENT GRAPH PROMPT

  SPECIFY X-AXIS =>  RESULTS
  X-AXIS ATTRIBUTE =>  ELEMENT STRAIN E11
  NUMBER OF Y-AXIS ATTRIBUTES =>  1
  Y-AXIS ATTRIBUTE =>  ELEMENT STRESS S11
  GRAPH OVER =>  LOADCASES
  FOR WHICH LOADCASES =>  LC1 1 TO LC1 10
  FOR WHICH ELEMENT(S) =>  3 5

A graph of ELEMENT STRESS S11 against ELEMENT STRAIN E11 for elements 3 and 5 over loadcase LC1 steps 1 to 10 is drawn.

4.

PRESENT GRAPH PROMPT

  SPECIFY X-AXIS =>  RESULTS
  X-AXIS ATTRIBUTE =>  NODAL STRAIN YY
  NUMBER OF Y-AXIS ATTRIBUTES =>  2
  Y-AXIS ATTRIBUTE =>  NODAL STRESS YY
  Y-AXIS ATTRIBUTE =>  NODAL DISPLACE YY
  GRAPH OVER =>  LINE(S)
  FOR WHICH LINE(S) =>  NODES LIST 10 TO 20
  FOR WHICH LOADCASE(S) =>  L1

A graph of NODAL STRESS YY and NODAL DISPLACE YY against NODAL STRAIN YY along a line of nodes from 10 to 20 for loadcase L1 is drawn.

See also the following commands

'PRESENT GRAPH ELEMENT'
'PRESENT GRAPH LINE'
'PRESENT GRAPH NODE'
'PRESENT GRAPH RESULTS'
'PRESENT OPTIONS GRAPH'

 

Figure 2.100: Graph plots