SHOCK PROPAGATION THROUGH ARCHITECTURED PRINTCAST COMPOSITES
Abstract
The performance of reactive and energetic materials is often limited by property trade-offs, where improving one material property degrades others. For example, reactive materials with attractive fragmentation behavior often have poor strength and ductility. Past attempts to overcome these property trade-offs have involved manipulating the chemistry and microstructure of materials to tailor their fragmentation/reaction behaviors, with incremental improvements in performance achieved through trial-and-error experimentation. Following a different approach, this proposal seeks to revolutionize the design of reactive and energetic materials by using a hybrid additive manufacturing process termed PrintCasting to create composite architectures that decouple properties that are normally linked. The PrintCast process consists of two steps: First, additive manufacturing is used to fabricate a lattice preform in the shape of the final component. Next, this preform is infiltrated with a second constituent that has a melting point lower than that of the lattice. The resulting solidified part is a periodic interpenetrating composite. PrintCasting offers exceptional control over microstructure and can pattern constituents with micron-scale spatial resolution, making it a powerful new tool for tailoring the mesostructure of reactive and energetic composites to achieve specific desirable properties. Unfortunately, implementing PrintCasting in such applications remains a challenge, due mainly to a poor understanding of shock dynamics in architectured composites. The scientific goal of this proposal is therefore to elucidate and quantify the deformation mechanisms in periodic 3D composites under shock loading conditions. This work will reveal how the mesostructure of 3D composites and the properties of their constituents affect the fine structure of a shock, thereby enabling the rational design of reactive and energetic composite materials with precisely controlled combinations…
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2021
- Source ID
- FA95502010429
Entities
People
- Zachary C. Cordero
Organizations
- Air Force Office of Scientific Research
- Massachusetts Institute of Technology
- United States Air Force