====== CSTLS ======

===== Description =====

Plane or axisymmetric state. \\
For the axisymmetric state, the symmetry axis is Y. The element is defined by 4 nodes and is build from assembling 4 triangular sub-elements with a constant strain field (Constant Strain Triangle){{  :elements:cstls.png?300|}}.\\
Element type: 6 \\
Implemented by: X.C. Wang (1991)

==== Files ====
Prepro: CSTLSA.F \\
Lagamine: CSTLSB.F

===== Input file =====

^Title (A5)^^
|TITLE|"CSTLS" in columns 1 to 5|
^ Control data (2I5) ^^
|NELEM| Number of elements |
|INDPP| 0 → No specific weight (or volumic mass if NTANA = -1) \\ 1 → Specific weight taken into account (or volumic mass if NTANA = -1)|
^Only if INDPP = 1 (3G10.0)^^
|WSPE(1)| = specific weight in X direction|
|WSPE(2)| = specific weight in Y direction|
|WSPE(3)| = density| 
^Definition of the elements (I5/4I5) ^^
|LMATE| Material |
|NODES(4)| List of nodes|