Dynamic Compression of Stoichastic Foams with Velocimetry and Imaging Diagnostics

Foams and polymers undergo densification when dynamically compressed, transitioning the materials from reactants to products. During gas gun driven planar impact, we can observe shock driven compression and/or decomposition with velocimetry probes that capture the particle velocity traces. Due to the stochastic nature of these foam materials, they not only act to slow the shockwave but alter the arrival times and quality of the traces at the individual velocimetry probes introducing additional uncertainties into these measurements. Accounting for these uncertainties is difficult when using only velocimetry probes; however, imaging, such as phase contrast imaging (PCI) or radiography, provides the ability to capture both shock and particle velocity in situ. We have studied both SX358 and APO-BMI with PCI, radiography and velocimetry to, in theory, understand how each diagnostic affects uncertainties measured during dynamic compression of stochastic foam materials.