====== SUCHA ======
Force distributed on a surface \\
===== Description =====

This element applies a normal pressure $P$ and two tangent stresses $\tau$ oriented along axes $\xi$ and $\eta$ on a surface defined by a variable number of nodes (3, 4, 6 or 8). \\
\\
The forces are defined by the fictive law [[laws:licha|LICHA]]. These forces are multiplicated either by multiplicator FMULT or by DMULT. \\
\\
The positive axis of tangent stresses is directed in the opposite direction of axes $\xi$ (oriented positively from IP1 to IP2) and $\eta$ (oriented positively from IP1 to IP3). The positive axis for pressure is also opposite to the normal of the element.
{{ :elements:sucha_1.png  |}}
Type: 19 \\
Implemented by: J-P. Radu - November 1988
==== Files ====
Prepro: SUCHAA.F \\
Lagamine: SUCHAB.F
===== Input file =====

^ Line 1 (A5)^^
|TITLE|"SUCHA" in the first five columns|
^Line 2 (2I5)^^
|NELEM|Number of elements|
|NNODE|Number of nodes in the element|
^Definition of the elements (2I5/8I5) repeated NELEM times^^
|NINTE| Number of integration points (4 or 9, 3 or 7)|
|LMATE|Material law|
|NODES(8)|List of nodes defining the element|
{{  :elements:plxls.png?500  |}}

===== Results =====
Sigma(3,NPI): pressure $P$ and tangent stresses $\tau_{\eta}$ and $\tau_{\xi}$