Characterization of Impact-Induced Dynamic Fragmentation and Reaction of Reactive Materials with Temporally- and Spatially-Resolved Diagnostics
Abstract
We propose to develop a suite of diagnostics to dynamically characterize the fragmentation process when a reactive material fragment impacts a screen or a solid wall as well as the subsequent ignition and combustion processes. The primary fragment will be accelerated by a two-stage light gas gun to a velocity in the range of 0.5 – 3 km/s. After impact fragmentation, the size of the cloud of particles that is generated will be characterized with flash X-ray radiography and high-speed videography. The velocity of the fragments generated will be determined with a laser-based particle image velocimetry system. As well, the number and extent of the fragments produced will be imaged using an impact plate that is coated with a material that luminesces upon impact. The temperature of the fragments after ignition and combustion will be dynamically characterized with a spatially-resolved two-color pyrometer, based on a multi-lens high-speed camera system. To characterize the temperature of ambient gas species, an absorption spectroscopy system will used. The scientific issues that will be addressed are related to both the fragmentation and reaction processes. The degree of fragmentation following impact of a reactive fragment with a screen or solid wall will be determined as a function of the fragment impact velocity and the shock impedances of the materials. The critical conditions for the initiation of reaction upon impact will be determined for a range of reactive materials. The effect of the relative velocity between a burning metal particle and the surrounding atmosphere on the particle combustion mechanism will also be investigated. At the conclusion of the project, it is expected that the dataset accumulated will provide a valuable resource that can be used to validate numerical models for the fragmentation and combustion processes.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 16, 2019
- Source ID
- HDTRA11810011
Entities
People
- David Frost
Organizations
- Defense Threat Reduction Agency
- McGill University