/PROP/TYPE16 (SH_FABR)
Block Format Keyword This property set is used to define the anisotropic layered shell property set. This property is currently only compatible with elastic anisotropic fabric (/MAT/LAW58 (FABR_A)).
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/PROP/TYPE16/prop_ID/unit_ID or /PROP/SH_FABR/prop_ID/unit_ID | |||||||||
prop_title | |||||||||
Ishell | Ismstr | Ish3n | P_thickfail | ||||||
hm | hf | hr | dm | ||||||
N | Thick | Ashear | Ithick | ||||||
VX | VY | VZ | skew_ID | Ipos | IP | ||||
ti | Zi | mat_IDi |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
ti | Zi | mat_IDi |
Definitions
Field | Contents | SI Unit Example |
---|---|---|
prop_ID | Property
identifier. (Integer, maximum 10 digits) |
|
unit_ID | Unit Identifier. (Integer, maximum 10 digits) |
|
prop_title | Property
title. (Character, maximum 100 characters) |
|
Ishell | Shell element formulation flag.
(Integer) |
|
Ismstr | Shell small strain
formulation flag.
(Integer) |
|
Ish3n | 3 node shell element
formulation flag.
(Integer) |
|
P_thickfail | Element suppression
criterion. It is ratio of the sum of failed integration points
thickness over total shell thickness necessary to delete the
element. 7 This option used for /FAIL/FABRIC.
(Real) |
|
hm | Shell membrane hourglass
coefficient. Only used when Ishell=1, 2, 3, 4. Default = 0.01 Default = 0.1 for Ishell =3 (Real) |
|
hf | Shell out-of-plane
hourglass. Only used when Ishell=1, 2, 3, 4. Default = 0.01 (Real) |
|
hr | Shell rotation hourglass
coefficient. Only used when Ishell=1, 2, 3, 4. Default = 0.01 Default = 0.1 for Ishell =3 (Real) |
|
dm | Shell membrane
damping. It is used for material LAW58. Default =0.075 for Ishell ≠12 Default =0.2 for Ishell =12 Default = 0.0 for all 3 node shells (Real) |
|
N | Number of layers, with
. 6
Default = 1 (Integer) |
|
Thick | Shell
thickness. (Real) |
|
Ashear | Shear factor. Default is Reissner value: 5/6 (Real) |
|
Ithick | Shell resultant stresses
calculation flag.
(Integer) |
|
VX | X component for reference
vector. 3 Default = 1.0 (Real) |
|
VY | Y component for reference
vector. Default = 0.0 (Real) |
|
VZ | Z component for reference
vector. Default = 0.0 (Real) |
|
skew_ID | Skew identifier for
reference vector. 3 Default = 0 (Integer) |
|
Ipos | Layer positioning flag for
reference vector. 4
Default = 0 (Integer) |
|
IP | Reference direction in
shell plane. 3
(Integer) |
|
Angle
of 1st local axis for layer
i. 3 (Real) |
||
Angle between first and
second axis. 3 Default = 90.0 (Real) |
||
ti | Thickness
ti of layer
i. (Real) |
|
Zi | Z position of layer i
(Zi defines the
position of the middle of the layer). Default = 0.0 (Real) |
|
mat_IDi | Material identifier for
layer i. Same material should be used for all
layers. (Integer) |
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
- Ishell – 4-node shell
formulation flag
The hourglass formulation is visco-elastic for Q4 shells (Ishell=1,2,3,4).
- hm, hf, and hr - Hourglass coefficients
- hm, hf, and hr are used only for Q4 shells (Ishell=4). They must have a value between 0 and 0.05.
- For Ishell=3, default values of hm and hr are 0.1 with larger values possible.
- Anisotropy direction
definition.The reference vector is defined as following according flag IP:
- If IP=0 and skew_ID = 0, the reference vector is defined with VX, VY and VZ.
- If IP=0 and skew_ID ≠ 0, the reference vector is the first direction (local X) of the local coordinate system skew_ID.
- If IP = 20, the reference vector is defined with the node N1 and N2 of the shell elements.
- If IP = 22, the reference vector is the first direction (local X) of the local coordinate system skew_ID. Vector components VX, VY and VZ are ignored.
- If IP = 23, the reference vector is defined with VX, VY and VZ. Local coordinate system skew_ID is ignored.
The reference vector is projected on the shell element plane and becomes the vector . Then for each layer, the 1st material direction (m1) is vector turned degrees (turns positive direction around shell normal ).
Figure 1.The hierarchy order to define the reference vector 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 2nd material direction m2 is derived from direction m1 with the angle . If , the layer is orthotropic.
- Ipos – Layer position
Ipos= 0: layer positions are calculated automatically.
If(1) - A warning message is displayed
- Individual layer
thickness will be adjusted to new layer thickness
with:
(2) Here "Thick" and are the shell thickness and layer thickness which specified in input.
Figure 2. - Ipos = 1: all
layer positions in the element thickness are user defined (with
and
).
- “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.
- 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.
- Each i layer has only 1 integration point through its thickness.
- Option P_thickfail is used by /FAIL/FABRIC criterion. This is the only criterion which is compatible with /PROP/TYPE16 and /MAT/LAW58.