1. Status Update-Backed Tests vs. Simulation Comparison
Department of Mechanical & Aerospace Engineering
Dynamic Mechanics of Materials Laboratory
Status Update-Backed Tests vs. Simulation Comparison
Nathan Spulak
February 16, 2017 1 1

2. Simulation Mesh Size vs. Test VSGL
Department of Mechanical & Aerospace Engineering
Dynamic Mechanics of Materials Laboratory
Mesh Size Comparison
Simulation Mesh Size vs. Test VSGL
Test Scenario
3D Simulation Mesh Size (mm)
Average VSGL (mm)
Unbacked
0.12
0.255
0.05” Backer, 0.089” Punch
0.07
0.269
0.1” Backer, 0.063” Punch 2 2

3. Strain Data from Area of Interest
Department of Mechanical & Aerospace Engineering
Dynamic Mechanics of Materials Laboratory
Strain Data from Area of Interest
Find number of strain values within the target area of interest 3 3

4. Strain Data from Area of Interest
Department of Mechanical & Aerospace Engineering
Dynamic Mechanics of Materials Laboratory
Strain Data from Area of Interest
Test Scenario
DIC # Points/Area [points/mm2]
Target Area [mm2]
# Points in Target Area
(approximate)
Unbacked
351.55
ε1≥0.02 , Area=44.33
15,583
ε1≥0.19 , Area=0.687
241
0.05” Backer, 0.089” Punch
398.0
ε1≥0.02 , Area=89.75
35,719
*Note: DIC values taken from backing plate, not specimen
ε1≥0.19 , Area=0.2297 91
0.1” Backer, 0.063” Punch
377.3
ε1≥0.02 , Area=138.1
52,103
ε1≥0.19 , Area=2.861
1,079 4 4

5. Load-Displacement Curve Comparison
Department of Mechanical & Aerospace Engineering
Dynamic Mechanics of Materials Laboratory
Load-Displacement Curve Comparison 5 5

6. Annealed Cu Testing Data
Department of Mechanical & Aerospace Engineering
Dynamic Mechanics of Materials Laboratory
Annealed Cu Testing Data
0.125” Annealed Cu
(Machined to 0.1” thick for backing plate)
0.05” Annealed Cu 7 7

7. Dynamic Mechanics of Materials Laboratory
Department of Mechanical & Aerospace Engineering
Dynamic Mechanics of Materials Laboratory
Next Steps:
Input test data from Cu into DYNA, see how that affects simulation results
Proceed with Sequentially Loaded Backed Tests
Continue new experiment designs to obtain triaxialities between -1/3 and +1/3 along
Lode=-1 8 8