====== ELA-TR ======
===== Description =====
Elastic constitutive law for solid elements at constant temperature
==== The model ====
This law is only  used by TRUSS elements
==== Files ====
Prepro: LELATR.F \\
===== Availability =====
|Plane stress state| YES |
|Plane strain state| YES |
|Axisymmetric state| NO |
|3D state| NO |
|Generalized plane state| NO |
===== Input file =====
==== Parameters defining the type of constitutive law ====
^ Line 1 (2I5, 60A1)^^
|IL|Law number|
|ITYPE| 5 |
|COMMENT| Any comment (up to 60 characters) that will be reproduced on the output listing|
==== Integer parameters ====
^ Line 1 (I5) ^^
|ISOL| = 0 : use of total stresses in the constitutive law |
|:::| = 1 : use of effective stresses in the constitutive law |
==== Real parameters ====
^ Line 1 (2G10.0) ^^
|E| YOUNG’s elastic modulus |
|ANU| Area of the TRUSS elements |
===== Stresses =====
==== Number of stresses ====
2
==== Meaning ====
The stresses are the PIOLA-KIRCHOFF number 2 Normal Force in the TRUSS element. \\
|SIG(1)|$N_{PK2}$ at node I|
|SIG(2)| $N_{PK2}$ at node J|

N.B. SIG(1) = SIG(2)

===== State variables =====
==== Number of state variables ====
1
==== List of state variables ====
|Q(1)| =0 |