/PROP/TYPE16 (SH_FABR)

Format

Definitions

Example

#RADIOSS STARTER
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#-  1. LOCAL_UNIT_SYSTEM:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/2
unit for PROP
#              MUNIT               LUNIT               TUNIT
                  Mg                  mm                   s
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#-  2. GEOMETRICAL SETS:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE16/2/2
prop type 16
#   Ishell    Ismstr     Ish3n                                       Pthick_fail
         0         0         0                                                 0
#                 hm                  hf                  hr                  dm
                   0                   0                   0                   0
#        N                         Thick              Ashear              Ithick
         3                           1.6                   0                   0
#                 Vx                  Vy                  Vz   skew_ID      Ipos                  Ip
                   1                   0                   1         0         0                   0
#                Phi               Alpha                  Ti                  Zi   mat_IDi
                  45                  90                  .5                             1          
                  90                  90                  .6                             2          
                 -45                  90                  .5                             1          
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#enddata
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

Comments

1. I_shell – 4-node shell formulation flag

   The hourglass formulation is visco-elastic for Q4 shells (I_shell=1,2,3,4).

2. h_m, h_f, and h_r - Hourglass coefficients
   • h_m, h_f, and h_r are used only for Q4 shells (I_shell=4). They must have a value between 0 and 0.05.
   • For I_shell=3, default values of h_m and h_r are 0.1 with larger values possible.
3. Anisotropy direction definition.
   The reference vector $V$ is defined as following according flag I_P:

   • If I_P=0 and skew_ID = 0, the reference vector $V$ is defined with VX, VY and VZ.
   • If I_P=0 and skew_ID ≠ 0, the reference vector $V$ is the first direction (local X) of the local coordinate system skew_ID.
   • If I_P = 20, the reference vector $V$ is defined with the node N1 and N2 of the shell elements.
   • If I_P = 22, the reference vector $V$ is the first direction (local X) of the local coordinate system skew_ID. Vector components VX, VY and VZ are ignored.
   • If I_P = 23, the reference vector $V$ is defined with VX, VY and VZ. Local coordinate system skew_ID is ignored.
   The reference vector $V$ is projected on the shell element plane and becomes the vector $V^{\prime }$ . Then for each layer, the 1^st material direction (m1) is vector $V^{\prime }$ turned ${\varphi }_i$ degrees (turns positive direction around shell normal $n$ ).

   
   
   Figure 1.

   The hierarchy order to define the reference vector $V$ is:

   • initial state card (/INISHE/ORTHO)
   • shell property

   In case of reference metrics, the orientation for directions of anisotropy must be defined with the reference geometry, not the initial one.

   The 2^nd material direction m2 is derived from direction m1 with the angle ${\alpha }_i$ . If ${\alpha }_i=90°$ , the layer is orthotropic.

4. I_pos – Layer position

   I_pos= 0: layer positions are calculated automatically.

   If (1)

   $$Thick\ne {\displaystyle \sum _i^N{t}_i}$$

   • A warning message is displayed
   • Individual layer thickness will be adjusted to new layer thickness $t_i^{new}$ with:(2)
     $$Thick={\displaystyle \sum _i^N{t}_i^{new}}$$
     Here "Thick" and $t_i$ are the shell thickness and layer thickness which specified in input.

     
     
     Figure 2.

   • I_pos = 1: all layer positions in the element thickness are user defined (with $t_i$ and $Z_i$ ).
     • “Thick” is not checked, as it does not need to be equal to the sum of layer thickness.
     • Multiple layers are allowed to have the same space position.

   For more details, refer to Layer thickness and position calculation. in FAQs.

5. The material law number given in /PART will be used to define the density and Young’s Modulus which then is used to calculate the time step and interface stiffness.
6. Each i layer has only 1 integration point through its thickness.
7. Option P_thick_fail is used by /FAIL/FABRIC criterion. This is the only criterion which is compatible with /PROP/TYPE16 and /MAT/LAW58.