Block Format Keyword This property set is used to define the sandwich
shell property set using the stack and ply approach. Only one integration point can be
defined for each ply.
Description
There are two possible inputs:
All elements may have different number of plies by associating a group of
elements to the ply in a way similar to OptiStruct.
The layout is described by a sequence of substacks
("SUB"), which are comprised of several plies. The
interplay between substacks is defined with the keyword
INT.
The input can be either "substack" or by ply, but not both.
Format
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
/PROP/TYPE17/prop_ID/unit_ID or
/PROP/STACK/prop_ID/unit_ID
Ply positions are automatically calculated with regard
to ply thicknesses. The coherence of global thickness
with the sum of ply thicknesses is automatically
checked.
= 1
All ply positions in the element thickness are
user-defined. Multiple plies may have the same special
position. Global thickness is not checked in this case,
since it needs to not be equal to sum of ply
thicknesses.
=2
The shell element reference plane is at
Z0 from the bottom
surface of the shell.
=3
The top surface of the shell is considered as element
reference plane.
=4
The bottom surface of the shell is considered as element
reference plane.
(Integer)
Sub
=SUB:
Indicates the beginning of a substack definition. 11
(Must be left
justified)
(Integer)
Nsub
Substack identification
number.
(Integer)
Sub-plyn
Number of plies in
substack.
(Integer)
Substack
Name
Name of the
substack.
(Maximum 100 characters)
Pply_IDi
Pply_IDj
Ply property identifier
for ply i (j). Ply defned with
/PROP/TYPE19.
(Integer)
i
= 1, 2, 3 … 200
j = 1, 2, 3 …
200
Minterply
Interply material
identifier (needed only if plyxfem formulation is activated
Plyxfem=2). 13
This material is ignored, if the plyxfem
formulation is not activated
(Plyxfem=0).
Z position of ply i (j)
(Zi or
Zj defines the
position of the middle of the ply).
Default = 0.0
(Real)
Int
=INT: Indicates the connection between 2
substacks (If used must be left
justified).
(Integer)
Pply_IDt
Ply identification number of the top ply
of the bottom substack. One of ply_ID in
Pply_IDi or
Pply_IDj.
(Integer)
Pply_IDb
Ply identification number of the bottom
ply of the top substack. One of ply_ID in
Pply_IDi or
Pply_IDj.
(Integer)
Example (Ply with /DRAPE)
There are three plies in this example. Use /DRAPE to change the
ply orientation so that each ply has a different material direction (fiber
direction), and different material (which is defined in each ply with
/PROP/TYPE19) is also applied. Figure 1.
#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
kg mm ms
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#- 2. GEOMETRICAL SETS:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE17/2/2
composite combine by substack
# Ishell Ismstr Ish3n Idrill Plyxfem Z0
12 0 0 1 0 0
# hm hf hr dm dn
0 0 0 .1 .1
# Istrain Thick Ashear Ithick Iplas
0 0 0 1 1
# VX VY VZ skew_ID Iorth Ipos
0 1 0 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Sub Nsub Sub-plyn
SUB 1 4
Top substack
# Pply_IDi PHIi Zi
11 0 0
#Minterply
# Pply_IDi PHIi Zi
12 90 0
#Minterply
# Pply_IDi PHIi Zi
13 0 0
#Minterply
# Pply_IDi PHIi Zi
14 90 0
#Minterply
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Sub Nsub Sub-plyn
SUB 2 4
Left substack
# Pply_IDi PHIi Zi
21 90 0
#Minterply
# Pply_IDi PHIi Zi
22 0 0
#Minterply
# Pply_IDi PHIi Zi
23 90 0
#Minterply
# Pply_IDi PHIi Zi
24 0 0
#Minterply
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Sub Nsub Sub-plyn
SUB 3 4
Right substack
# Pply_IDi PHIi Zi
31 90 0
#Minterply
# Pply_IDi PHIi Zi
32 0 0
#Minterply
# Pply_IDi PHIi Zi
33 90 0
#Minterply
# Pply_IDi PHIi Zi
34 0 0
#Minterply
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Sub Nsub Sub-plyn
SUB 4 3
Middle substack
# Pply_IDi PHIi Zi
41 90 0
#Minterply
# Pply_IDi PHIi Zi
42 0 0
#Minterply
# Pply_IDi PHIi Zi
43 90 0
#Minterply
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Int Pply_IDt Pply_IDb
INT 14 21
INT 14 31
INT 43 21
INT 34 41
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/11/2
PROP number 11
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 45 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/12/2
PROP number 12
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 45 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/13/2
PROP number 13
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 45 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/14/2
PROP number 14
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 45 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/21/2
PROP number 21
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 46 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/22/2
PROP number 22
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 46 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/23/2
PROP number 23
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 46 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/24/2
PROP number 24
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 46 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/31/2
PROP number 31
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 47 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/32/2
PROP number 32
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 47 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/33/2
PROP number 33
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 47 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/34/2
PROP number 34
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 47 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/41/2
PROP number 41
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 44 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/42/2
PROP number 42
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 44 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/43/2
PROP number 43
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 44 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#enddata
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
Example (Substack)
Substack definition for the ply layout. Figure 2.
#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
kg mm ms
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#- 2. GEOMETRICAL SETS:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE17/2/2
composite combine by substack
# Ishell Ismstr Ish3n Idrill Plyxfem Z0
12 0 0 1 0 0
# hm hf hr dm dn
0 0 0 .1 .1
# Istrain Thick Ashear Ithick Iplas
0 0 0 1 1
# VX VY VZ skew_ID Iorth Ipos
0 1 0 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Sub Nsub Sub-plyn
SUB 1 4
Top substack
# Pply_IDi PHIi Zi
11 0 0
#Minterply
# Pply_IDi PHIi Zi
12 90 0
#Minterply
# Pply_IDi PHIi Zi
13 0 0
#Minterply
# Pply_IDi PHIi Zi
14 90 0
#Minterply
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Sub Nsub Sub-plyn
SUB 2 4
Left substack
# Pply_IDi PHIi Zi
21 90 0
#Minterply
# Pply_IDi PHIi Zi
22 0 0
#Minterply
# Pply_IDi PHIi Zi
23 90 0
#Minterply
# Pply_IDi PHIi Zi
24 0 0
#Minterply
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Sub Nsub Sub-plyn
SUB 3 4
Right substack
# Pply_IDi PHIi Zi
31 90 0
#Minterply
# Pply_IDi PHIi Zi
32 0 0
#Minterply
# Pply_IDi PHIi Zi
33 90 0
#Minterply
# Pply_IDi PHIi Zi
34 0 0
#Minterply
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Sub Nsub Sub-plyn
SUB 4 3
Middle substack
# Pply_IDi PHIi Zi
41 90 0
#Minterply
# Pply_IDi PHIi Zi
42 0 0
#Minterply
# Pply_IDi PHIi Zi
43 90 0
#Minterply
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
# Int Pply_IDt Pply_IDb
INT 14 21
INT 14 31
INT 43 21
INT 34 41
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/11/2
PROP number 11
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 45 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/12/2
PROP number 12
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 45 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/13/2
PROP number 13
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 45 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/14/2
PROP number 14
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 45 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/21/2
PROP number 21
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 46 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/22/2
PROP number 22
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 46 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/23/2
PROP number 23
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 46 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/24/2
PROP number 24
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 46 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/31/2
PROP number 31
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 47 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/32/2
PROP number 32
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 47 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/33/2
PROP number 33
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 47 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/34/2
PROP number 34
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 47 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/41/2
PROP number 41
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 44 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/42/2
PROP number 42
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 44 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/PROP/TYPE19/43/2
PROP number 43
# mat_ID_i t delta_phi id_grsh4n id_grsh3n Npt_ply A_i
1 .5 45 44 0 0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#enddata
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
Comments
The stack property is
used in combination with /PROP/TYPE19 (PLY) to create
composites properties through the ply-based definition.
The ply defined with /PROP/TYPE19 used in option
Pply_IDi or
Pply_IDj. in this
stack property.
Only 1 integration point can be defined per ply i.e.,
Npt_ply =1 in /PROP/TYPE19
(PLY).
Ishell, Ish3n – 4-node and 3-node shell
formulation flag
Ishell =
1,2,3,4
(Q4): original 4 nodes Radioss shell with
hourglass perturbation stabilization
Ishell =
24 (QEPH): formulation with hourglass physical
stabilization for general use.
Ishell =
12 (QBAT): modified BATOZ Q4 y24 shell with four
Gauss integration points and reduced integration for in-plane shear. No
hourglass control is needed for this shell.
Ish3n = 30 (DKT18):
BATOZ DKT18 thin shell with three Hammer integration points.
The hourglass formulation is visco-elastic for Q4 shells.
Ismstr - Small strain
formulation
Small strain formulation is activated from time t = 0, if Ismstr =
1 or 3. It may be used for a
faster preliminary analysis, but the accuracy of results is not ensured.
Any shell for which can be switched to a small strain
formulation by Radioss Engine option
/DT/SHELL/CST, except if Ismstr =
4.
If the small strain option is set to 1 or 3, the strains and stresses
which are given in material laws are engineering strains and stresses;
otherwise they are true strains and stresses.
hm, hf, and hr - Hourglass coefficients
hm, hf, and hr are only used for Q4 shells. 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.
dn - Shell
numerical damping coefficient
Ishell =
12, 24:
for Ishell =
24,
dn is
used for hourglass stress calculation
for Ishell =
12 (QBAT),
dn is
used for all stress terms, except transverse shear;
for Ish3n =
30 (DKT18),
dn is
only used for membrane.
Ithick - Shell resultant stresses
calculation flag
If Ithick = 1, the small
strain option is automatically deactivated in the corresponding type of
element.
Iplas - Shell plane stress
plasticity flag
Iplas is available for
material LAW27
It is recommended to use Iplas =1, if Ithick =1.
If Iplas =1, the small
strain option is automatically deactivated in the corresponding type of
element.
Idril - Drilling degree of
freedom stiffness flag
Drilling DOF stiffness is recommended for implicit solutions especially
for Riks method and bending dominated problems.
Idril is available for
QEPH, QBAT (Ishell =
12 or 24), and standard triangle
(C0) shell elements (Ish3n= 1
or 2).
Anisotropy in local
coordinate system
Two different ways to define the anisotropy direction with
this property:
Skew_ID=0
Anisotropy direction defined with global vector (components defined in Line 6)
and angle (angle in degree) for each
ply.
Skew_ID≠0
Anisotropy direction defined with skew (X-axis in skew replaces
the global vector ) and angle (angle in degree) for each
ply.
Projection of vector (or x-axis of skew)on shell element plane
becomes the vector . Then for each ply, the first anisotropic
direction (direction 1) is vector is turned degrees; where, positive rotation is based
on the shell normal . Figure 3.
The angle between local anisotropic direction 1 and 2
(directions of anisotropy) for each ply which defined in
/PROP/TYPE19.
In case of reference metrics, the orientation for directions of
anisotropy must be defined with the reference geometry, not the initial
one.
Ipos - ply position
In this property, ply position defined with
Zi and option
Ipos.
Zi values are real ply
positions in the local Z axis (negative and positive value are allowed
and Zi defines the
position of the middle of each ply).
Z0 only used with Ipos=2, it indicated
distance from the shell element reference middle surface to the bottom
surface of the whole ply or stack. For more information, see Ipos=2
Ipos= 0: ply positions
are automatically calculated with regard to ply thicknesses.
The input thickness “Thick” may be
equal to zero as the true shell thickness is always calculated
from the ply thicknesses and positions of ply defined by
Zi.
If the input thickness “Thick” is
different from 0.0, a warning will be displayed if the
calculated thickness from the plies is different from the input thickness.
Figure 4.
Ipos= 1: All ply
positions and thickness in the element are user-defined (with in /PROP/PLY and
Zi).
Global thickness “Thick” is not
checked, as it does not need to be equal to the sum of ply
thickness.
Multiple plies are allowed to have the same space position.
This option is not recommended unless the number of ply is
constant for all elements.
Ipos= 2: the shell
element mid-surface is at Z0 from the
bottom of the ply layout.
Figure 5.
Ipos = 3: the top of
the ply layout is coincident with the element mid-surface
Figure 6.
Ipos = 4: the bottom of
the ply layout is coincident with the element mid-surface
Figure 7.
Define by substack
If the substack definition is used, each substack definition begins with
the keyword “SUB” and the substack identification
number.
All the plies until the next keyword “SUB” or the
keyword “INT” is encountered belong to the same
substack.
All substacks must be defined before defining the
“INT” connections.
If an element contains plies belonging to several substacks, the
connection between the substacks is defined with an
“INT” connection: the ply
Pply_IDt of the
first substack is connected to the ply
Pply_IDb of the
second substack.
For more details, refer to the above examples for this property.
Material for each
ply
Material for each ply defined with mat_ID in
/PROP/TYPE19.
Material between each ply defined with Minterply
inside this property. It used for Plyxfem formulation.
This property is only compatible with Material Laws 25, 27, 36, 60, 72,
93 and user laws.
Material law type for ply must be the same for each ply
The material law number given in /PART will be used
to define the mass and the sound speed of the composite, as well as the
interface stiffness.
The material law type input in the /PART definition
must be identical to the material law type used in mat_ID in
/PROP/TYPE19.
Plyxfem formulation
The plyxfem formulation is activated using the
Plyxfem flag. It used to describe the
delamination between plies.
Once plyxfem is activated (Plyxfem=2) then an
interply material (Minterply) must be defined between
each ply.
This interply material must use LAW1 with Ladeveze failure criteria
(/FAIL/LAD_DAMA) for delamination.
