background image
Code_Aster
®
Version
7.4
Titrate:
Modeling
D_PLAN_ABSO
Date:
01/06/05
Author (S):
G. DEVESA, F. LEBOUVIER
Key
:
U3.13.12-C
Page
:
1/2
Instruction manual
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A
Organization (S):
EDF-R & D/AMA, DeltaCAD















Instruction manual
U3.13 booklet: Mechanical finite elements 2D
Document: U3.13.12



Modeling
D_PLAN_ABSO




Summary:

This document describes for modeling
D_PLAN_ABSO
:
·
degrees of freedom carried by the finite elements which support modeling,
·
the related meshs supports,
·
supported loadings,
·
nonlinear possibilities,
·
case-tests implementing modeling.

Modeling
D_PLAN_ABSO
(Phenomenon:
MECHANICS
) corresponds to finite elements of which meshs
supports are linear. They make it possible to take into account the condition of absorbing border of sections
solids, studied in plane deformations.
background image
Code_Aster
®
Version
7.4
Titrate:
Modeling
D_PLAN_ABSO
Date:
01/06/05
Author (S):
G. DEVESA, F. LEBOUVIER
Key
:
U3.13.12-C
Page
:
2/2
Instruction manual
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A
1 Discretization
1.1
Degrees of freedom
Modeling
Degrees of freedom (with each node node)
D_PLAN_ABSO
DX
: following displacement
X
DY
: following displacement
Y
1.2
Meshs supports of the matrices of rigidity
The meshs supports of the finite elements are segments. The elements are isoparametric.
Modeling Nets Interpolation
Remarks
D_PLAN_ABSO SEG2
linear
SEG3
quadratic
1.3
Meshs supports of the loadings
The same ones as previously.

2 Loadings
supported
The loading available is as follows:
·
“ONDE_PLANE”
Allows to impose a seismic loading by plane wave.

3 Possibilities
non-linear
3.1
Laws of behaviors
The only relation of behavior, available under
DYNA_NON_LINE,
for this modeling, under
COMP_INCR
is the relation
“ELAS”
.
3.2 Deformations
Only linearized deformations key word
“SMALL”
under
DEFORMATION
are available.

4
Example of implementation: case-test
·
Non-linear dynamics
SDLV120B [V2.04.120]: Analyze propagation of a wave of compression in a bar
infinite rubber band (absorption of the wave at the border of the mesh).