Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
1/10
Organization (S): EDF/IMA/MN, SAMTECH
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
Document: V3.03.020
SSLS20 - Cylindrical Coque free pinch on board
Summary:
The test from guide VPCS, makes it possible to check the effect of a specific loading on a thin cylindrical hull
in linear elasticity. One compares the arrows with the point of application of the loading compared to one
modeling of the thin cylindrical hull in elements DKT and two modelings COQUE_3D (1/8 cylinder is
represented).
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
2/10
1
Problem of reference
1.1 Geometry
y
F
F
D
With
D
C
With
X
C
B
B
L
F
Z
R
L
eighth of cylinder
Length
L = 10.35 m
Radius
R = 4.953 m
Thickness
T = 0.094 m
1.2
Material properties
E = 10.5 106 Pa
= 0.3125
1.3
Boundary conditions and loadings
Specific force: F = 100. NR
F
With
B
F
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
3/10
2
Reference solution
2.1
Method of calculation used for the reference solution
The reference solution is that given in card SSLS20/89 of guide VPCS.
It was established by average of results of several software packages of calculation by the method of
finite elements.
2.2
Results of reference
Displacement of point A following y: v = ­ 0.1139
2.3
Uncertainty on the solution
2%
2.4 References
bibliographical
[1]
G. HORRIGMOE, P.G. BERGAN “Non linear analysis off free from shells by flat finite
elements " Computer Mathematics in Applied Mechanics and Engineering Amsterdam, North
Holland, vol. 16 (1978)
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
4/10
3 Modeling
With
3.1
Characteristics of modeling
Element of hull DKT
y
D
L
longitudinal twinge
= 3.7
X
30t
With
C
circumferential twinge 0. 5 R = 8.3
10 T
Z
B
Modeling of a eighth of cylinder
Cutting: 10 on AD and BC 15 on AB and cd. ==> 300 meshs TRIA3
Limiting conditions:
in all the nodes of arc AB
DDL_IMPO:
(GROUP_NO: AB DZ: 0., DRX: 0., DRY: 0.)
segment) AD)
(GROUP_NO: ADsansA DX:0., DRY:0., DRZ:0.)
segment) BC)
(GROUP_NO: BCsansB DY:0., DRX:0., DRZ:0.)
in A
(GROUP_NO: WITH DX: 0., DRZ:0.)
out of B
(GROUP_NO: B DY: 0., DRZ:0.)
Loading:
with node A
FORCE_NODALE: (GROUP_NO: In Fy:­ 25. )
Name of the nodes:
Not A = NO176 Not C = NO1
Not B = NO11 Not D = NO166
3.2
Characteristics of the grid
A number of nodes: 176
A number of meshs and types: 300 TRIA3
3.3 Functionalities
tested
Commands
Keys
AFFE_CARA_ELEM
COQUE
TOUT
[U4.24.01]
AFFE_CHAR_MECA
DDL_IMPO
GROUP_NO
[U4.25.01]
FORCE_NODALE
GROUP_NO
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
5/10
4
Results of modeling A
4.1 Values
tested
Not
Size and unit
Reference
Aster
% difference
With
displacement v (m)
­ 0.1139
­ 0.1128
­ 0.54
4.2 Parameters
of execution
Version: 4.00.02
Machine: CRAY C90
System:
UNICOS 8.0
Obstruction memory:
8 megawords
Time CPU To use:
5.1 seconds
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
6/10
5 Modeling
B
5.1
Characteristics of modeling
Element of hull COQUE_3D MEC3QU9H
y
D
L
longitudinal twinge
= 3.7
X
30t
With
C
circumferential twinge 0. 5 R = 8.3
10 T
Z
B
Modeling of a eighth of cylinder
Cutting: 4 on AD and BC 4 on AB and cd. ==> 16 meshs QUAD9
Limiting conditions:
in all the nodes of arc AB
DDL_IMPO:
(GROUP_NO: AB DZ: 0., DRX: 0., DRY: 0.)
segment) AD)
(GROUP_NO: ADsansA DX:0., DRY:0., DRZ:0.)
segment) BC)
(GROUP_NO: BCsansB DY:0., DRX:0., DRZ:0.)
in A
(GROUP_NO: WITH DX: 0., DRZ:0.)
out of B
(GROUP_NO: B DY: 0., DRZ:0.)
Loading:
with node A
FORCE_NODALE: (GROUP_NO: In Fy:­ 25. )
Name of the nodes:
Not A = NO3 Not C = NO1
Not B = NO4 Not D = NO2
5.2
Characteristics of the grid
A number of nodes: 65
A number of meshs and types: 16 QUAD9
5.3 Functionalities
tested
Commands
Keys
AFFE_CARA_ELEM
COQUE
TOUT
[U4.24.01]
AFFE_CHAR_MECA
DDL_IMPO
GROUP_NO
[U4.25.01]
FORCE_NODALE
GROUP_NO
AFFE_MATERIAU
TOUT
[U4.23.02]
AFFE_MODELE
“MECANIQUE”
“COQUE_3D”
TOUT
[U4.22.01]
DEFI_MATERIAU
ELAS
[U4.23.01]
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
7/10
6
Results of modeling B
6.1 Values
tested
Not
Size and unit
Reference
Aster
% difference
With
displacement v (m)
­ 0.1139
­ 0.1136
­ 0.26
6.2 Parameters
of execution
Version: 4.00.14
Machine: CRAY C90
System:
UNICOS 8.0
Obstruction memory:
16 megawords
Time CPU To use:
5.0 seconds
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
8/10
7 Modeling
C
7.1
Characteristics of modeling
Element of hull COQUE_3D MEC3TR7H
y
D
L
longitudinal twinge
= 3.7
X
30t
With
C
circumferential twinge 0. 5 R = 8.3
10 T
Z
B
Modeling of a eighth of cylinder
Cutting: 5 on AD and BC 12 on AB and cd. ==> 120 meshs TRIA7
Limiting conditions:
in all the nodes of arc AB
DDL_IMPO:
(GROUP_NO: AB DZ: 0., DRX: 0., DRY: 0.)
segment) AD)
(GROUP_NO: ADsansA DX:0., DRY:0., DRZ:0.)
segment) BC)
(GROUP_NO: BCsansB DY:0., DRX:0., DRZ:0.)
in A
(GROUP_NO: WITH DX: 0., DRZ:0.)
out of B
(GROUP_NO: B DY: 0., DRZ:0.)
Loading:
with node A
FORCE_NODALE: (GROUP_NO: In Fy:­ 25. )
Name of the nodes:
Not A = NO3
Not C = NO1
Not B = NO4
Not D = N02
7.2
Characteristics of the grid
A number of nodes: 275
A number of meshs and types: 120 TRIA7
7.3 Functionalities
tested
Commands
Keys
AFFE_CARA_ELEM
COQUE
TOUT
[U4.24.01]
AFFE_CHAR_MECA
DDL_IMPO
GROUP_NO
[U4.25.01]
FORCE_NODALE
GROUP_NO
AFFE_MATERIAU
TOUT
[U4.23.02]
AFFE_MODELE
“MECANIQUE”
“COQUE_3D”
TOUT
[U4.22.01]
DEFI_MATERIAU
ELAS
[U4.23.01]
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
9/10
8
Results of modeling C
8.1 Values
tested
Not
Size and unit
Reference
Aster
% difference
With
displacement v (m)
­ 0.1139
­ 0.1112
­ 1.76
8.2 Parameters
of execution
Version: 4.00.14
Machine: CRAY C90
System:
UNICOS 8.0
Obstruction memory:
16 megawords
Time CPU To use:
12.6 seconds
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A

Code_Aster ®
Version
4.0
Titrate:
Cylindrical SSLS20 Coque pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D Page:
10/10
9
Summary of the results
With regard to the elements:
· DKT:
-
Suitable solution for a fine network.
-
To supplement later on:
-
by a less fine grid,
-
by an analysis of the constraints,
-
by 4 modelings (DKQ, DST, DSQ, Q4G).
· MEC3QU9H: very good solution obtained with a relatively coarse network.
· MEC3TR7H: to arrive at a suitable solution, that requires a fine grid, compared
with that for element MEC3QU9H. De même compared with element DKT, the number of nodes
total is much more important.
Handbook of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A