About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Dynamic Behavior of Materials IX
|
Presentation Title |
MOVED TO WEDNESDAY PM - Investigating Spall Failure in Shock Compressed Iron |
Author(s) |
Gaia Righi, Carlos Ruestes, Camelia Stan, Suzanne Ali, Robert Rudd, Hye-Sook Park, Marc Meyers |
On-Site Speaker (Planned) |
Gaia Righi |
Abstract Scope |
Spall response of pure iron was studied using high power pulsed laser experiments at the LLNL Jupiter facility. Thin iron foils of varying initial microstructures were subjected to peak pressures of 60 GPa and strain rates ranging from 106 s-1 – 107 s-1. Simultaneous time-resolved free surface velocity measurements and recovery techniques were used to investigate spall strength and failure mechanisms. These uniaxial strain experiments yielded strengths between 5 and 10 GPa for nanocrystalline and single crystal iron, respectively. Post-shock characterization and Molecular Dynamics simulations verify that this difference is due to void initiation sites. Grain boundaries in nano and polycrystalline iron are favorable sites for voids nucleation and will consequently cause failure to occur along grain boundaries perpendicular to the shock direction. In contrast, the formation and interaction of twin boundaries in single crystal iron are the cause for void initiation, growth, and coalescence that ultimately cause ductile failure. |
Proceedings Inclusion? |
Planned: |