Monday  |  Salon 11  |  01:50 PM–02:10 PM

#15937, Unconfined Compression of F50 sand Kel-F Composites under In-situ Observations

Particulate composites are used in various applications including concrete and explosives. As a mock material system, F50 sand is blended with Kel-F to form a composite, which is tested under unconfined compression. The initial internal microstructure of the composite is scanned with an X-ray tomography system. The F50 sand grain has a median grain size of 0.45 mm. The solid density of silica-based sand is 2.65 g/cm3. The compressive behavior is investigated under both quasi-static compression and also under high strain rates.

Under quasi-static loading conditions, a cylinder composite sample is compressed while in-situ volumetric images are acquired under loads on an X-ray tomography system. The images are analyzed to segment individual grains. Digital volume correlation was conducted to determine the deformations of individual grains.

Under high strain rates, an 80-ft long split Hopkinson pressure bar is used to compress the composite while a high-speed camera is used to acquire video of the sample under deformations. The stress-strain relationships are determined. In addition, digital image correlation is conducted to determine the surface deformations.

The results from these experiments provide detailed initial microstructures, internal deformations of the sample under quasi-static loading conditions, and surface deformation for a sample under high strain rates. The work presented herein provides mechanical behavior, which is linked to the internal microstructure of the composite. The results can be analyzed further to validate exascale simulations on particulate composites.

Pooyan Javadzadeh   The University of Texas at Dallas
Christopher Paniagua   The University of Texas at Dallas
Runy Zhang   The University of Texas at Dallas
Yao Ren   The University of Texas at Dallas
Ning Bian   The University of Texas at Dallas
Huiluo Chen   The University of Texas at Dallas
Summer Camerlo   Colorado School of Mines
Gus Becker   Colorado School of Mines
Amy Clarke   Colorado School of Mines
Hongbing Lu   The University of Texas at Dallas