Granular materials under shear and pressure

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Presentation transcript:

Granular materials under shear and pressure Lettuce crops sheared by a geological fault Allyson Rice, Matt Harrington, Professor Wolfgang Losert

What are granular materials? Discrete macroscopic particles Solids, liquids, and gases commons.wikimedia.org physicscentral.com

Index matching to image grains in 3D camera acrylic tank Index matched liquid 635 nm lasers motor 0.06 degree/s 5 cm

How do we track grains in 3D? Dijksman et al. (2012) 1. Locate particles 2. Follow motion

Grains move differently under pressure No pressure Pressure

Conclusions & Acknowledgements 3D tools to study sheared grains under pressure Analysis is extensive! Shear zone formation, vorticities in flow, mean square displacements (see poster) Thank you… TREND & NSF Losert lab Professor Losert Matt Harrington Nolan Ballew And you 