Block Format Keyword
/INISHE/STRS_F or /INISH3/STRS_F - Initial State for Stress
Description
Describes the initial state for stress.
Format
(1)
|
(2)
|
(3)
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(4)
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(5)
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(6)
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(7)
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(8)
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(9)
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(10)
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/INISHE/STRS_F/unit_ID or
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/INISH3/STRS_F/unit_ID
|
shell_ID
|
nb_integr
|
npg
|
Thick
|
|
|
|
|
|
 m
|
b
|
H1
|
H2
|
H3
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if nb_integr = 0
(1)
|
(2)
|
(3)
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(4)
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(5)
|
(6)
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(7)
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(8)
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(9)
|
(10)
|
 1
|
2
|
12
|
23
|
31
|
p
|
b1
|
b2
|
b12
|
|
|
if nb_integr > 0
(1)
|
(2)
|
(3)
|
(4)
|
(5)
|
(6)
|
(7)
|
(8)
|
(9)
|
(10)
|
1
|
2
|
12
|
|
|
|
|
23
|
31
|
p
|
|
|
|
|
Field
|
Contents
|
SI Unit Example
|
unit_ID
|
Optional unit identifier
(Integer, maximum 10 digits)
|
|
shell_ID
|
Element identifier
(Integer)
|
|
nb_integr
|
Integration point number through the thickness
Must be equal to the number of integration points given in the shell property.
(Integer)
|
|
npg
|
Number of surface quadrature points
Must be set according to the formulation which is used in the shell property.
(Integer)
= 0: default set to 1
= 1: must be used for shell formulations Ishell =1, 2, 3, 4 or Ish3n =1, 2, 31
= 3: must be used for DKT18 shell formulation (Ish3n =30)
= 4: must be used for BATOZ or QEPH formulation (Ishell =12, 24)
|
|
Thick
|
Shell thickness (see Comment 8)
(Real)
|
|
m
|
Total membrane energy
(Real)
|
|
b
|
Total bending energy
(Real)
|
|
H1
|
Hourglass force (see Comment 3)
(Real)
|
|
H2
|
Hourglass force (see Comment 3)
(Real)
|
|
H3
|
Hourglass force (see Comment 3)
(Real)
|
|
1
|
First plane stress
(Real)
|
|
2
|
Second plane stress
(Real)
|
|
12
|
Shear stress
(Real)
|
|
23
|
Shear stress
(Real)
|
|
31
|
Shear stress
(Real)
|
|
p
|
Plastic strain
(Real)
|
|
b1
|
Bending stress
(Real)
|
|
b2
|
Bending stress
(Real)
|
|
b12
|
Bending stress
(Real)
|
|
|
| 1. | The H1, H2 and H3 are read only when npg = 0 or npg = 1. |
| 2. | The bending stresses are: |
where, l is the length, e is the thickness, and M is the moment.
| 3. | For npg = 0 or 1 and nb_integr > 0, the optional continuation lines have to be repeated for each integration point. |
| 4. | For npg = 3 or 4, the optional continuation lines must be repeated npg times for each integration point as follows: |
repeat for each integration point
Line 7
Line 8
| 5. | The initial state for shell may be defined by more than one block. |
| 6. | The value given for thickness (Thick) will be used instead of the thickness given in property or in the shell definition. |
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