| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Dynamic Behavior of Materials: Experiments and Molecular Dynamics Simulations
|
| Presentation Title |
Shock-induced Spallation in Monocrystalline Boron Carbide |
| Author(s) |
Ghatu Subhash, Amith Adoor Cheenady |
| On-Site Speaker (Planned) |
Ghatu Subhash |
| Abstract Scope |
Molecular dynamic simulations were used to investigate spall behavior in boron carbide (BC) along [111] and at 90° to [111] by propagating two tensile shock fronts of equal amplitude from opposite ends of a domain and meet at the center. In both cases, BC exhibited a linear-elastic axial stress-strain response up to the yield stress followed by non-linear behavior that differed significantly in the two orientations. Along [111], post-yield softening was followed by an almost perfectly plastic response. In contrast, a post-yield hardening was observed at 90° to [111] followed by an abrupt loss of strength. Spallation along [111] was accompanied by micro-crack initiation normal to the loading direction while at 90° to [111], spallation was preceded by crack formation at ~45° to the loading direction. These observations were explained by analyzing the deformation of the 41 bonds in the unit cell. |