/ANIM/SHELL/FLDZ

Format

Definitions

Comments

1. For a BATOZ shell element, the value is the average value of the Gauss points in the layer
2. The values of FLD zone index are:

   FLDZ=6

   Failure

   ${\epsilon }_{major}>{\epsilon }_{\lim }$

   FLDZ=5

   Marginal

   ${\epsilon }_{\lim }>{\epsilon }_{major}>{\epsilon }_{m\arg inal}$

   FLDZ=4

   Safe

   ${\epsilon }_{m\arg inal}>{\epsilon }_{major}>\left|{\epsilon }_{minor}\right|$

   FLDZ=3

   Compression

   $-{\epsilon }_{minor}>{\epsilon }_{major}>-{\epsilon }_{minor}\cdot \frac{R_{ani}}{1+R_{ani}}$

   FLDZ=2

   High wrinkle

   $-{\epsilon }_{minor}\cdot \frac{R_{ani}}{1+R_{ani}}>{\epsilon }_{major}$

   FLDZ=1

   Loose metal

   ${\epsilon }_{major}{}^2+{\epsilon }_{minor}{}^2>Factor\_Loosemeta{l}^2$

   
   
   Figure 1.

   Where,

   fct_ID

   Defined in /FAIL/FLD

   ${\epsilon }_{\lim }$

   Major strain as a limit from FLD diagram from fct_ID in /FAIL/FLD

   ${\epsilon }_{minor}$ and ${\epsilon }_{major}$

   The minimum and maximum principal strains

   R_ani

   Average anisotropy factor defined in FLD input in /FAIL/FLD

   $Factor\_Marginal$

   Defined in FLD input in /FAIL/FLD

   $Factor\_Loosemetal$

   Defined in FLD input in /FAIL/FLD

   (1)

   $$\alpha =\arctan \left(-\frac{R_{ani}}{1+R_{ani}}\right)$$

   I_marg

   Defined in FLD input in /FAIL/FLD

   If I_marg= 2, the marginal curve is defined by shifting the FLD curve with the constant value $Factor\_Marginal$ (2)

   $${\epsilon }_{m\arg inal}={\epsilon }_{\lim }-Factor\_Marginal$$
   If I_marg= 3, the marginal curve is defined as a factor of the $Factor\_Marginal$ (3)

   $${\epsilon }_{m\arg inal}={\epsilon }_{\lim }\left(1-Factor\_Marginal\right)$$