|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||Fragmentation in Ni-Al
||Andrew Marquez, Zezhou Li, Christopher H. Braithwaite, Timothy Weihs, Nicholas Krywopusk, David Gibbins, Marc Meyers
|On-Site Speaker (Planned)
The fragmentation and mechanical performance of nickel-aluminum compacts was examined under dynamic conditions using mesostructured powder compacts in which the interfaces between the powders were tailored during the swaging fabrication process. Fragmentation was created in ring samples of this material through explosively driven expansion and analyzed through high-speed photography, laser interferometry and soft capture of fragments. Quasi-static and dynamic mechanical testing was conducted to examine the mechanical performance and to provide parameters for the constitutive description. Experimental results are compared with fragmentation theories to characterize the behavior of reactive powders based on the material’s mesostructure by introducing the fracture toughness of the compacts. The fracture toughnesses are related to the interfacial cohesion between particles and the fragmentation is a direct consequence of these parameters. The mean fragment size is calculated using a modified form of Mott’s theory and successfully compared with experimental results.
||Planned: Supplemental Proceedings volume