4. Model B#
4.1. Characteristics#
The Model B demonstrates the velocity dependence of the UMAT law. This test stands as pure numerical test (figure 4). It is the time step which controls the rate of the deformations (Table1).
Test Scenarii Plotted |
Loading Rate (s) |
Final Time (s) |
Total Displacement Prescribed (\(>\) |
Time steps (s) |
|
0.1s |
1 |
0.1 |
0.1 |
0.001 |
|
1s |
0.1 |
1 |
0.1 |
0.01 |
|
10s |
0.01 |
10 |
0.1 |
0.1 |
|
100s |
0.001 |
100 |
100 |
0.1 |
1 |
1000s |
0.0001 |
1000 |
1000 |
0.1 |
10 |
10000s |
0.00001 |
10000 |
0.1 |
100 |
Table 1: Table of velocity-dependent rate
Figure 3: Visco-plasticity results
4.2. Fields tested and results#
GROUP_MA =” GRAIN1 “at t=0.1s
Identification |
Reference |
Tolerance (%) |
VMIS SIEQ_ELGA (0.1s) |
184.089 |
2.5E-1 |
VMIS SIEQ_ELGA (1s) |
184.089 |
2.5E-1 |
VMIS SIEQ_ELGA (10s) |
184.089 |
2.5E-1 |
VMIS SIEQ_ELGA (100s) |
184.089 |
1.5E-1 |
VMIS SIEQ_ELGA (1000s) |
184.089 |
1.5 E-1 |
VMIS SIEQ_ELGA (10000s) |
184.089 |
1.E-4 |