# Page 1: SPlane (Section Plane)

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• Figure 1 – SPlane Interface

## Purpose:

The SPlane interface is used to create section planes that can be used to perform section cuts of the model for further analysis. Various methods of cutting model cross sections are available, and the model can be animated in section cut mode.

The cross section plane can be fixed to space, fixed to the model and a lagrangian type section cutting is also available. If the model is fringed with plastic strains prior to cutting section, then the section cut will be fringed also. Model can be clipped on either side of the section plane by Off/Clip-/Clip+.

## Controls:

• FixS – Fixed in Space means that the section plane will not move once defined.
• FixM – Fixed to Model means that the section plane can move if the nodes used to define it move.
• Lagr – Lagrangian means that a group of elements is cut initially, and then those same elements are tracked throughout the animation (and are not confined to a flat plane as the model deforms). This option is most similar to *DATABASE_CROSS_SECTION.
• 1p+NL – Define plane with 1 point and a normal
• BasePt – Define base point by entering x, y, z coordinates
• BaseNd – Define base point by picking/entering a node ID

• X: Enter base point x-coordinate
• Y: Enter base point y-coordinate
• Z: Enter base point z-coordinate
• Node: Enter node number for base point

Set x-component of normal vector to 1

Set y-component of normal vector to 1

Set z-component of normal vector to 1

(User also has the option to manually enter the x, y, and z-components in the fields provided)

• N1-N2 – Define plane with 2 nodes (node 1 on plane, node 2 indicates normal vector)
• Node1 – Enter or pick node 1
• Node2 – Enter or pick node 2
• 3Nds – Define plane with 3 nodes
• Node1 – Enter or pick node 1
• Node2 – Enter or pick node 2
• Node3 – Enter or pick node 3
• 2Nds+D – Define plane by picking 2 nodes and a direction cosine
• Node1 – Enter or pick node 1
• Node2 – Enter or pick node 2

Enter X directional cosine component

Enter Y directional cosine component

Enter Z directional cosine component

Use centroid of model as base point

Clear base point and normal settings

• Clipping Mode: Choose clipping mode (Off/Clip+/Clip-)
• Kp cuts – Keep and display all section cuts

Clear all section cuts

Cut the section

Other options

• This sub-panel allows changing color and with of section cut lines, projecting the section cut to true view and turning part thickness and vector plotting of element quantities at section level. Section cuts can be exported in various formats.

• ShowPl – Show section plane with model
• ShMesh – Show section plane as mesh
• Outline – Show 3D model outline with section
• Grid Size: Enter grid size for mesh

• LnWidth: Set section cut line width
• LnColor: Set section cut line color

• Color/Cut – Use different color for each section cut
• Thickness – Draw section cut with thickness

Project view section cut normal to section plane

• VP: Draw vector n section cut
• X/Y/Z – The X/Y/Z component of vector on/off
• Vector Size: Set vector size for vector point

• Format: choose desired output format (Keyword/VDA/IGES/Coord+V)
• State: Enter state number for the section data to be written

Start writing section data to file

Write section data for current state

Plot intrusions relative to a plane

• Allows plotting crush of a point in the model with respect to a plane. This plane can be fixed to space or moving with the model.

• LnWidth: Select intrusion plotting line width
• LnColor: Select intrusion plotting line color

• Plot Type: Select history plot type
• Node ID: Enter or pick a node ID to compute intrusion

Plot intrusion line data in current XY-Plot window

Plot intrusion line data in a new XY-Plot window

Add intrusion line data to current XY-Plot window

Clear picked/entered node IDs

Raise all open XY-Plot windows

Open and Raise all closed XY-Plot windows

Display normal model

Activate section cut measure interface

• Various measurements methods are available on section cuts: coordinate, distance, 3pt-angle, 3pt-radius and 2ln-angle. Although the main application for this is for metal forming simulations, it has wide range of applications in other fields.

• Coordinate: Choose quantity to be measured

Clear all measured highlight

Clear last picked position

Activate section cut line plot interface

• Section cut line plotting allows for plotting section properties (like shell thickness) on xy-plots. x-axis on the xy-plot is the length of the section cut line developed to a straight line. The main application of this is in metal forming simulations.

Plot section distance vs fringe component in current XY-Plot window

Plot section distance vs fringe component in a new XY-Plot window

Add section distance vs fringe component data to current XY-Plot window

Raise all open XY-Plot windows

Open and Raise all closed XY-Plot windows

Flip the XY curve in the x-axis

Open section force plot interface

• LS-DYNA has a facility to calculate and output section forces by user defining *DATABASE_CROSS_SECTION. This interface allows sections to be defined interactively and LS-PrePost computes the section quantities if shell resultants are available in d3plot files. Generally this data is available in d3plot files unless it is turned off by the use of *DATABASE_EXTENT_BINARY options.
• Menu: Select items for plotting

Plot section variable vs time in current XY-Plot window

Plot section variable vs time in a new XY-Plot window

Add selected data to current XY-Plot window

Raise all open XY-Plot windows

Open and Raise all closed XY-Plot windows

Clear selected items in the list

Activate save plane and cut interface

• Section plane definitions can be saved and loaded. This allows users define sections once and save them for future model revision use. Often users want to cut a cross section on various model iterations at the same specific location.

• Fname: Click to browse directory or enter filename
• Pname: Enter name for this section definition

Save current plane definition to buffer

Write plane definitions from buffer to file

Read plane definitions from file to buffer

Clear all plane definitions in buffer

Select plane definition from list as current plane

Delete elected plane definition from buffer

Exit section plane interface

SPlane Bottom Panel:

• Figure 2 – SPlane Bottom Panel
• Base Pt. Location: Dynamic display of base point coordinate (Xpos/Ypos/Zpos)
• Increment Type: choose section cut step increment type (#ofCuts/Duistance)

Step 1 increment back

animate moving plane along the normal

Step 1 increment forward

Update base point with the current position

Clear kept section cuts in memeory