Hypervelocity impacts on metallic foam core sandwich panels filled with shear thickening fluid
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Hypervelocity impact experiments were carried out on foam core sandwich composite specimens infused with a shear thickening fluid (STF). Two 0.064 cm thick aluminum facesheet sandwich composites with 1.27 cm thick open cell ∼2 pores per cm aluminum foam cores were infused with a STF consisting of a 0.2 mass fraction of Aerosil 200 fumed silica in 200 molecular weight polyethylene glycol (PEG). Two more identical foam core specimens were prepared and filled with only PEG. All specimens were subjected to hypervelocity impact testing using 1 mm diameter stainless steel spherical projectiles with approximate impact velocities of 3.8 km/s. Both the impact-side and rear-side facesheets of each specimen were perforated. However, the amount of out of plane deformation of the impact side and rear side facesheets as well as damage to the core was minimal for each specimen. Almost no damage was seen on witness plates, which indicates that most of the projectiles' energy was dissipated within the sandwich composites. The lack of disparity in the damage to the STF and PEG filled specimens is likely due to the low at rest viscosity of the STF as well as the large pore sizes of the aluminum foam.
author list (cited authors)
Warren, J., Offenberger, S., Lacy, T., Kundu, S., Toghiani, H., & Pittman, C. U.