(YIP) EFFECTS OF MATERIAL AND MORPHOLOGY ON 3D PARTICLE AND PORE DYNAMICS DURING RAPID COMPACTION OF GRANULAR MATERIALS
Abstract
The particle-scale dynamics of granular materials undergoing rapid compaction is of fundamental importance in manufacturing, planetary science, geology, and defense applications. During rapid compaction, granular materials are known to generate stress bridges or force chains, large shear stresses, and high temperatures with the potential to initiate reactions in energetic materials. Back-surface and through-thickness measurements have often been used to diagnose velocity, stress, and density heterogeneities and their effects during rapidly-compacted granular media. However, quantitative in-situ measurements of 3D particle-scale dynamics remain limited. The goals of this proposal are two-fold. The first goal of this proposal is to develop and validate a method for quantifying 3D particle and pore dynamics and strains during rapid granular compaction by combining tomographic imaging and time-resolved in-situ 2D X-ray imaging. The second goal is to use the method to study the effects of particle material and morphology on particle velocities, particle strains, pore size evolution, and compaction front widths and their dispersion. The research plan involves three major tasks. The first task involves developing an analysis framework that integrates X-ray computed tomography (XRCT), in-situ X-ray phase contrast imaging (XPCI), and optimization algorithms to infer 3D kinematics of particles and pores. The second task involves using in-situ XPCI during plate-impact experiments into granular media with varying particle material and morphologies at velocities crossing the quasi-static to dynamic shock regimes, across which particle-scale dynamics change dramatically. These experiments will primarily be performed at synchrotron facilities such as the Advanced Photon Source (APS) and Cornell High Energy Synchrotron Source (CHESS). The third task involves analysis of experimental data for particle velocities, particle strains-stresses, pore size distributions, and compaction front widths and their dispersion, as well as dissemination of results to national lab collaborators and the shock physics community for model validation.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 07, 2023
- Source ID
- FA95502210121
Entities
People
- Ryan C. Hurley
Organizations
- Air Force Office of Scientific Research
- Johns Hopkins University
- United States Air Force