Collapse of Hollow Cylinders of PTFE and Aluminum Particles Mixtures Using Hopkinson Bar

摘要

Hopkinson bar based thick walled cylinder (TWC) method was developed to collapse hollow cylinders with small mass about 0.5 gram made from the mixtures of PTFE and Al particles of different sizes (2 and 95 μm). Different media (water, suspension of alumina particles in water, and glycerol) in different geometrical configurations were investigated to ensure the collapse of hollow cylinders with a single pressure pulse under pressure/time conditions achievable in Hopkinson bar tests. Raman spectroscopy of the samples of PTFE and 2 μm aluminum particles mixtures demonstrated the evidence of the decomposition or reaction of PTFE inside the shear localization area or cracks.