About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Journal of the American Ceramic Society Awards Symposium
|
Presentation Title |
Initial Fragmentation and Granular Transition of Ceramics |
Author(s) |
Lori Graham-Brady, Amartya Bhattacharjee, Ryan Hurley |
On-Site Speaker (Planned) |
Lori Graham-Brady |
Abstract Scope |
As armor ceramics are impacted, crack growth and coalescence lead to an initial state of fragmentation, causing a granular medium that resists penetration through various energy dissipation mechanisms, such as granular friction and re-fragmentation. The fragmented material also abrades the penetrator itself. Hence, initial fragmentation and granular transition of ceramics play a vital role in the penetration resistance of ceramics. Instantaneous crack statistics predicted from a previously developed crack growth model, modified to account for flaw orientation distribution, are used as inputs to a fragmentation and crack coalescence model to predict fragment statistics. Cracks are modelled discretely in a voxellized simulation region with periodic boundary conditions. Neighboring cracks are allowed to coalesce. Fragments are delineated using a connected region approach, with morphological dilation to compensate for resolution effects. Fragment size and shape distribution, are used to conduct parametric studies and propose a microstructure dependent granular transition criterion. |