Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
1/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
Organization (S):
EDF/IMA/MN, SAMTECH
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
Document: V3.03.020
SSLS20 - Cylindrical hull 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).
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
2/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
1
Problem of reference
1.1 Geometry
C
B
With
D
L
y
X
Z
R
F
eighth of cylinder
C
D
F
B
L
F
With
Length
L = 10.35 m
Radius
R = 4.953 m
Thickness
T = 0.094 m
1.2
Material properties
E = 10.5 10
6
AP
= 0.3125
1.3
Boundary conditions and loadings
Specific force: F = 100. NR
F
B
F
With
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
3/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
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 “Not linear analysis off free from shells by flat finite
elements " Mathematics Computer in Applied Mechanics and Amsterdam Engineering, North
Holland, vol. 16 (1978)
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
4/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
3 Modeling
With
3.1
Characteristics of modeling
Element of hull DKT
C
D
B
With
y
X
Z
longitudinal twinge
circumferential twinge
Modeling of a eighth of cylinder
L
30t
=
3. 7
0.5
R
10 T
=
8.3
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 mesh
A number of nodes: 176
A number of meshs and types: 300 TRIA3
3.3 Functionalities
tested
Controls
Keys
AFFE_CARA_ELEM
HULL
ALL
[U4.24.01]
AFFE_CHAR_MECA
DDL_IMPO
FORCE_NODALE
GROUP_NO
GROUP_NO
[U4.25.01]
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
5/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
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
Overall dimension memory:
8 megawords
Time CPU To use:
5.1 seconds
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
6/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
5 Modeling
B
5.1
Characteristics of modeling
Element of hull
COQUE_3D
MEC3QU9H
C
D
B
With
y
X
Z
longitudinal twinge
circumferential twinge
Modeling of a eighth of cylinder
L
30t
=
3. 7
0.5
R
10 T
=
8.3
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 mesh
A number of nodes: 65
A number of meshs and types: 16 QUAD9
5.3 Functionalities
tested
Controls
Keys
AFFE_CARA_ELEM
HULL
ALL
[U4.24.01]
AFFE_CHAR_MECA
DDL_IMPO
FORCE_NODALE
GROUP_NO
GROUP_NO
[U4.25.01]
AFFE_MATERIAU
ALL
[U4.23.02]
AFFE_MODELE
“MECHANICAL”
“COQUE_3D”
ALL
[U4.22.01]
DEFI_MATERIAU
ELAS
[U4.23.01]
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
7/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
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
Overall dimension memory:
16 megawords
Time CPU To use:
5.0 seconds
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
8/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
7 Modeling
C
7.1
Characteristics of modeling
Element of hull
COQUE_3D
MEC3TR7H
C
D
B
With
y
X
Z
longitudinal twinge
circumferential twinge
Modeling of a eighth of cylinder
L
30t
=
3. 7
0.5
R
10 T
=
8.3
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 mesh
A number of nodes: 275
A number of meshs and types: 120 TRIA7
7.3 Functionalities
tested
Controls
Keys
AFFE_CARA_ELEM
HULL
ALL
[U4.24.01]
AFFE_CHAR_MECA
DDL_IMPO
FORCE_NODALE
GROUP_NO
GROUP_NO
[U4.25.01]
AFFE_MATERIAU
ALL
[U4.23.02]
AFFE_MODELE
“MECHANICAL”
“COQUE_3D”
ALL
[U4.22.01]
DEFI_MATERIAU
ELAS
[U4.23.01]
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
9/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
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
Overall dimension memory:
16 megawords
Time CPU To use:
12.6 seconds
Code_Aster
®
Version
4.0
Titrate:
Cylindrical SSLS20 Hull pinch on free board
Date:
01/12/98
Author (S):
P. MASSIN, A. LAULUSA
Key:
V3.03.020-D
Page:
10/10
Manual of Validation
V3.03 booklet: Linear statics of the hulls and the plates
HI-75/98/040 - Ind A
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 mesh,
-
by an analysis of the stresses,
-
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 mesh, compared
with that for element MEC3QU9H. In the same way compared with element DKT, the number of nodes
total is much more important.