3. Modeling A#
3.1. Characteristics of modeling#
The 0.25 m long double-supported structure, extending between X = -0.1 m and X = 0.15 m, is connected in volume in the zone of overlap, which extends between the positions 0.0 m and 0.05 m, to a 3D model by the 3D option POU_ARLEQUIN of the keyword LIAISON_ELEM of the operator AFFE_CHAR_MECA.
It is modelled by Timoshenko beam elements (POU_D_T) and linear solid elements (PENTA6 and HEXA8).
Image 3.1-1 : 3D volume model mesh
DYNA_LINE_TRAN calculate the dynamic response of the structure for 3 s, due to a nodal force with a value equal to 100 N on the 3D mesh node located at X = 0.02 m.
3.2. Characteristics of the mesh#
Number of stitches HEXA8 |
150 |
Number of stitches PENTA6 |
50 |
Number of stitches POU_D_T |
20 |
Table 3.2-1
3.3. Tested sizes and results#
The tables below give the numerical values tested in this test case. These are the minimum and maximum movements in Z of a 3D mesh node located at X = 0.04 m.
Identification |
Maximum instants |
Reference type |
Reference value |
Tolerance |
Minimal Z displacement |
2.205 s |
“AUTRE_ASTER” |
-0.00033054 |
|
Maximum Z displacement |
2,700 s |
“AUTRE_ASTER” |
+0.00033065 |
|
Table 3.3-1 : Summary of tested results
The responses of the 1D and mixed 1D-3D models of the structure are represented on the graph below.
Image 3.3-2 : Responses of 1D and mixed 1D-3D models