| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Fracture in Metals: Insights from Experiments and Modeling Across Length and Time Scales
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| Presentation Title |
In-situ Measurement of Damage Evolution in Shocked Magnesium as a Function of Microstructure |
| Author(s) |
B. MacNider, David R. Jones, Jesse Callanan, M. Beason, D. M. Dattelbaum, N. Boechler, Saryu Jindal Fensin |
| On-Site Speaker (Planned) |
Saryu Jindal Fensin |
| Abstract Scope |
This work investigates the nucleation and evolution of spall-induced void damage in magnesium of varying microstructure, using an in-situ, absorption contrast imaging approach. Damage and failure in ductile metals is characterized by nucleation, growth, and coalescence of voids. The underlying mechanisms and kinetics that control void nucleation and growth have been linked to material microstructure, but the specific controlling mechanisms associated with these processes are not understood or predicted. Hence, it is impossible to quantitatively understand and develop the physics that addresses basic questions like “how do materials fail?” This lack of understanding is in part related to a deficiency in experimental techniques that allow for direct quantitative and statistically relevant observations of void nucleation and early-stage growth. These in-situ observations have long remained a grand experimental challenge, largely due to the extremely fine spatial (nm) and narrow temporal (fs-ns) scales involved during actual loading experiments. In this work, we close this gap by performing in-situ direct imaging of void onset and growth at unprecedented spatial resolution for the first time. |