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

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 0.26904 2 2

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

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

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

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

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