====== LOACQ ======

===== Description =====

Constitutive law for loading (thin) 3D shell elements.

==== The model ====

This law is used for mechanical analysis of shells, loaded by uniform pressure and shear, normal and tangential to the mid-line $\xi$ at any moment, or in the global axes.\\

Loading can be driven either by force multiplicator (MULTF) or displacement multiplicator (MULTD).

==== Files ====

Prepro: LLOACQ.F \\
Lagamine: CLCOQ4.F

===== Availability =====

|Plane stress state| NO |
|Plane strain state| NO |
|Axisymmetric state| NO |
|3D state| YES |
|Generalized plane state| NO |

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

==== Parameters defining the type of constitutive law ====

^ Line 1 (2I5, 60A1)^^
|IL|Law number|
|ITYPE| 99|
|COMMENT| Any comment (up to 60 characters) that will be reproduced on the output listing|

==== Integer parameters ====

^ Line 1 (I5) ^^
|IDIRC| Index of the loading direction |
|:::| = 0 : Local direction |
|:::| = 1 : Global direction |

==== Real parameters ====

^ Line 1 (3G10.0) ^^
|PRESSF| Pressure $p_o$ (which will be multiplied by MULTF) |
|TAURF| Shear $\tau_r$ (which will be multiplied by MULTF) |
|TAUSF| Shear $\tau_s$ (which will be multiplied by MULTF) |
^ Line 1 (3G10.0) ^^
|PRESS| Pressure $p_o$ (which will be multiplied by MULTD) |
|TAURD| Shear $\tau_r$ (which will be multiplied by MULTD) |
|TAUSD| Shear $\tau_s$ (which will be multiplied by MULTD) |

===== Stresses =====

==== Number of stresses ====

3

==== Meaning ====

|SIG(1)| = p : Pressure (= $p_o$ * MULT) |
|:::| > 0 according with local coordinates of shell |
|SIG(2)| = $\tau$ : Shear (= $\tau_r$ * MULT) |
|:::| > 0 according with local coordinates of shell |
|SIG(3)| = $\tau$ : Shear (= $\tau_s$ * MULT) |
|:::| > 0 according with local coordinates of shell |

===== State variables =====

==== Number of state variables ====

1

==== List of state variables ====

|Q(1)| Without any meaning |