Code_Aster ®
Version
5.0
Titrate:
SSLS112 - Excentrement of composite plates


Date:
19/09/02
Author (S):
J. Mr. PROIX, G. BERTRAND Clé
:
V3.03.112-A Page:
1/4

Organization (S): EDF/AMA, CS IF
Handbook of Validation
V3.03 booklet: Linear statics of the plates and hulls
Document: V3.03.112

SSLS112 - Excentrement of composite plates

Summary:

This test makes it possible to validate the offsetting of composite plates.

The reference is given by a first resolution where one models a quadricouche presenting one
material not-symmetry compared to the average plan.

The validation is done in the second calculation where one models the quadricouche preceding model by
2 double-layered offset compared to the average plan of the first calculation.

Handbook of Validation
V3.03 booklet: Linear statics of the plates and hulls
HT-66/02/001/A

Code_Aster ®
Version
5.0
Titrate:
SSLS112 - Excentrement of composite plates


Date:
19/09/02
Author (S):
J. Mr. PROIX, G. BERTRAND Clé
:
V3.03.112-A Page:
2/4

1
Problem of reference

1.1 Geometry
A4
A3
5 subdivisions

Z
A1
A2
y

0,4

10 subdivisions

X

co-ordinates of the points (in m): A1 (0,0,0)
A2 (10,0,0) A3 (10,5,0) A4 (0,5,0)

1.2
Material properties

The material consists of 4 orthotropic layers thickness 0.1.

The first layers is characterized by:
EL = 20000.106 Pa
AND = 20000.106 Pa
VLT = 0.3
GLT = 2000.106 Pa

the second layer by:
EL = 15000.106 Pa
AND = 15000.106 Pa
VLT = 0.3
GLT = 1500.106 Pa

the third layer by:
EL = 20000.106 Pa
AND = 20000.106 Pa
VLT = 0.3
GLT = 2000.106 Pa

and the fourth layer by:
EL = 15000.106 Pa
AND = 15000.106 Pa
VLT = 0.3
GLT = 1500.106 Pa

1.3
Boundary conditions and loadings

The A1 node is embedded:

dx = 0.
Dy = 0.
dz = 0.



dRx = 0.
dRy = 0.
dRz = 0.

The A2 node is blocked according to following ddls:

dx = 0.
Dy = 0.


One applies a modal force Fz = - 1000.N to the A3 node.
Handbook of Validation
V3.03 booklet: Linear statics of the plates and hulls
HT-66/02/001/A

Code_Aster ®
Version
5.0
Titrate:
SSLS112 - Excentrement of composite plates


Date:
19/09/02
Author (S):
J. Mr. PROIX, G. BERTRAND Clé
:
V3.03.112-A Page:
3/4

2
Reference solution

2.1
Method of calculation used for the reference solution

The reference solution results from the first calculation with ASTER with the quadricouche describes in
the problem of reference.

2.2
Results of reference

They are consisted of the values of the field of displacement DX, DY, DZ, DRX, DRY at the A3 point
(N1 node for ASTER) and with the N10 node of co-ordinates (9,2,0).

2.3
Uncertainty on the solution

Null, since it is about the same calculation carried out by two different ways.

3 Modeling
With

3.1
Characteristics of modeling

The model consists of 2 double-layered plates corresponding to the average plan of the quadricouche of
model of reference.

To represent these 2 plates, one leaves the grid of the average plan of the quadricouche which one offsets
distances - 0.1 and 0.1.

PLAQ1
The elements used are elements of

plate DKT.

PLAQ
2

+
0.1
-
0.1


Handbook of Validation
V3.03 booklet: Linear statics of the plates and hulls
HT-66/02/001/A

Code_Aster ®
Version
5.0
Titrate:
SSLS112 - Excentrement of composite plates


Date:
19/09/02
Author (S):
J. Mr. PROIX, G. BERTRAND Clé
:
V3.03.112-A Page:
4/4

3.2
Characteristics of the grid

Z

y

5

5
X

The grid is regular.
There are 10 subdivisions according to X and 5 subdivisions according to y; that is to say on the whole 50 meshs DKQ (quad4) and 66
nodes.

3.3 Functionalities
tested

Order Mot
key


AFFE_CARA_ELEM
Offsetting

4
Result of modeling A

4.1 Values
tested

Identification Reference
(* 10-6m) ASTER (* 10-6m) %
Difference
DX (N1)
­ 3.680419
­ 3.680419
0
DY (N1)
­ 0.493941
­ 0.493941
0
DZ (N1)
­ 5697.7635
­ 5697.7635
0
DRX (N1)
­ 436.1676
­ 436.1676
0
DRY (N1)
508.6670
508.6670
0
DX (N10)
­ 2.172360
­ 2.172360
0
DY (N10)
­ 0.783905
­ 0.783905
0
DZ (N10)
­ 3946.2632
­ 3946.2632
0
DRX (N10)
­ 412.1209
­ 412.1209
0
DRY (N10)
455.0638
455.0638
0

5 Synthesis

The results obtained with offset multi-layer plates agree with the reference.

This test thus validates offsetting for the multi-layer plates.
Handbook of Validation
V3.03 booklet: Linear statics of the plates and hulls
HT-66/02/001/A

Outline document