Implications of Inherent Heterogeneities and Tailored Structural Configurations on High Strain Rate Mechanical Response and Chemical Reactivity of Additively Manufactured Energetic/Reactive Materials
Abstract
A multi-investigator collaborative project between Georgia Tech, AFRL-RWME, and the Sandia National Laboratories (SNL) is proposed aimed at characterizing the influence of process-inherent heterogeneities and tailored structures of additively manufactured energetic and reactive materials (AMEMs), on high strain rate mechanical response and chemical reactivity. Additive manufacturing (AM) offers the unique ability to "direct write" high-solids-loaded energetic polymer composites, typically via extrusion of "filaments" one layer at a time. The material build-up process, however, can introduce heterogeneities, such as constituent aggregation at the scale of individual filaments, as well as porosity gradients, periodicity, and anisotropy between and across individual filaments and layers (typically ~1 mm). The highly hierarchical and stochastic nature of such heterogeneities can affect shock-wave propagation, high-strain-rate mechanical properties, and reaction initiation/detonation thresholds in ways that make it difficult to obtain standardized properties, and predict the effectiveness and efficiency of additively manufactured energetic materials (AMEMs). The proposed project will involve an integrated approach that includes the following tasks: (a) additive manufacturing (AM) of solidloaded polymer composites of varying energetic/reactive components (including biocidals), tailored structures, and controlled heterogeneities, (b) 3-D microstructural characterization and quantification of the distributions of heterogeneities, (c) shock-compression and high-strain-rate experiments employing conventional diagnostics and novel optomechanical sensors, and (d) meso-/continuum-scale 3D computations with high-fidelity physics and chemistry-based models. The anticipated scientific impact of the proposed project is that it will help guide the development of energetic material printing technologies by identifying the level of precision and control required for AMEM end products
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 23, 2018
- Source ID
- HDTRA11810004
Entities
People
- Naresh Thadhani
Organizations
- Defense Threat Reduction Agency
- Georgia Tech Research Corporation