Data file(s):
case 1 (± 45° plies): plyuni-m020-1.dat
case 2 (0° plies): plyuni-m020-2.dat
Analysis type: Non linear static analysis
Keywords: Damage Ply material
The structure consists of a two-dimensional square sample. The sample is loaded under traction loads in function of time. Its length is 1 mm and its thickness 1 mm. Two stacking sequences are considered:± 45° plies (case 1) and 0° plies (case 2). As we use a unit thickness, the normal force in the membrane will be equal to the mean stress.
Figure 1: Description of the problem
The applied traction loads are defined in function of time as shown in figure 2.
Figure 2: Loading in function of time for case 1 (left) and for case 2 (right)
The analysis is performed with the non-linear module (MECANO). The command with the standard SAMCEF procedure for this example may be as follows on Unix workstations:
% samcef ba, me plyuni-m020-i n 2
We want to save (.SAI ARCH) the normal force and the upper skin strain tensor (STYP 9437 9445) of element 1 (components 1 and 2) as function of time. This selection has to be done in pre- treatment. The selected quantity will then be available in post-treatment. By default, selected results are saved at any time step.
% samcef bp plyuni-m020-i n 2
The data used to post-process the results is included in the bank files plyuni-m020-1.dat and plyuni-m020-2.dat, after the entry point .POST. It is loaded with:
Bacon>input.POST
Figures 3 and 4 show the axial mean stress in function of the axial and transverse strains. These results are plotted with:
.VIF code 9437 9445 MAI 1 1 COMP 1 1 CHA
code 9437 9445 MAI 1 1 COMP 1 2 SUP
Figure 3: Case 1 (±45°), normal force versus Upper skin strain tensor (component 1 in green, component 2 in blue)
In figure 3, we can see on the loading and unloading paths that there is a residual deformation (plasticity) and a loss of stiffness (damage).
Figure 4: Case 2 (0°), normal force versus Upper skin strain tensor (component 1 in green, component 2 in blue)
Figure 4 shows that the behavior is different in traction and in compression.
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Last update: 1-Mar-2018
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