Block Format Keyword Describes the surface segments definition.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
seg_ID1 node_ID1 node_ID2 node_ID3 node_ID4          
seg_ID2 node_ID1 node_ID2 node_ID3 node_ID4          
etc etc etc etc etc          
seg_IDn node_ID1 node_ID2 node_ID3 node_ID4          

Format for 2D and axisymmetrical analysis

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
seg_ID1 node_ID1 node_ID2              
seg_ID2 node_ID1 node_ID2              
etc etc etc              
seg_IDn node_ID1                


Field Contents SI Unit Example
surf_ID Surface identifier

(Integer, maximum 10 digits)

unit_ID Unit Identifier

(Integer, maximum 10 digits)

surf_title Surface title

(Character, maximum 100 characters)

seg_ID1, seg_ID2, seg_IDn, Segment identifier (optional)


node_ID1 Node identifier 1


node_ID2 Node identifier 2


node_ID3 Node identifier 3


node_ID4 Node identifier 4 (optional for triangular elements)




  1. Surfaces are used to define interfaces in 3D analysis and pressure loads.
  2. The node_ID4 may be omitted for triangular elements.
  3. Segments may be given by "cut and paste" of shell element input data.
  4. All nodes must belong to a shell element, a brick element or a triangular shell element.
  5. A surface cannot be defined using Madymo surfaces.
  6. A surface cannot be defined by associating a hyper-ellipsoid and another type of surface.