Block Format Keyword Describes the 2D solid elements based on 3 nodes. TRIA elements must be defined in the global YZ plane.

This element is only used with /MAT/LAW151 (MULTIFLUID) and /PROP/TYPE14 (SOLID). It is not compatible with any failure model.


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tria_ID node_ID1 node_ID2 node_ID3            


Field Contents SI Unit Examples
part_ID Part identifier of the block.

(Integer, maximum 10 digits)

tria_ID Element identifier.


node_ID1 Node identifier 1.


node_ID2 Node identifier 2.


node_ID3 Node identifier 3.




  1. The identifier must be unique in each element family, but it is advised for each element type to have a unique element identifier in the global model.
  2. More than one tria block can be used to define a part.
  3. Any number of trias can be defined in one block.
  4. The TRIA elements must be defined in the global YZ plane with the element normal pointing in global X direction.
  5. N2D3D parameter in /ANALY enables axisymmetrical modeling (N2D3D=1) or plane strain modeling (N2D3D=2).
  6. Use /H3D/ELEM for h3d output of TRIA element.