# Robert P. Behringer

## James B. Duke Professor of Physics

### Overview

Dr. Behringer's research interests include granular materials: friction, earthquakes, jamming; nonlinear dynamics; and fluids: Rayleigh-Benard convection, the flow of thin liquid films, porous media flow, and quantum fluids. His studies focus particularly on experiments (with some theory/simulation) that yield new insights into the dynamics and complex behavior of these systems. His experiments involve a number of highly novel approaches, including the use of photoelasticity for probing granular systems, innovative experiments to characterize the stability of surface flows and properties of gels, and magnetic resonance imaging to study flows in porous media.

Hartley, RR, Behringer, RP, Henkes, S, Bi, D, and Chakraborty, B. "Logarithmic strengthening of granular materials with shear rate." *AIP Conference Proceedings* 1145 (2009): 1089-1092.
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Dutt, M, and Behringer, RP. "A particle-substrate numerical model for a quasi-2D driven dissipative granular gas." *AIP Conference Proceedings* 1145 (2009): 1112-1115.
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Kondic, L, Fang, X, Dybenko, OM, and Behringer, RP. "Energy transport through dense granular matter." *AIP Conference Proceedings* 1145 (2009): 293-296.
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Behringer, RP, Bi, D, Chakraborty, B, Henkes, S, and Hartley, RR. "Why do granular materials stiffen with shear rate? Test of novel stress-based statistics." *Phys Rev Lett* 101.26 (December 31, 2008): 268301-.
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Utter, B, and Behringer, RP. "Experimental measures of affine and nonaffine deformation in granular shear." *Phys Rev Lett* 100.20 (May 23, 2008): 208302-.
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Matas, J-P, Uehara, J, and Behringer, RP. "Gas-driven subharmonic waves in a vibrated two-phase granular material." *Eur Phys J E Soft Matter* 25.4 (April 2008): 431-438.
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Behringer, RP, Daniels, KE, Majmudar, TS, and Sperl, M. "Fluctuations, correlations and transitions in granular materials: statistical mechanics for a non-conventional system." *Philos Trans A Math Phys Eng Sci* 366.1865 (February 28, 2008): 493-504.
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Matas, J-P, and Behringer, RP. "Square subharmonic waves in a vibrated two-phase granular material." *Europhys. J. E* 25 (2008): 431-438. (Academic Article)

Zhang, J, Majmudar, T, and Behringer, R. "Force chains in a two-dimensional granular pure shear experiment." *Chaos* 18.4 (2008).
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Behringer, RP, Chakraborty, B, and Henkes, S. "Why Do Granular Materials Stiffen at Faster Shear Rates? A Test of Novel Stress-Based Statsitical Mechanics." *Phys. Rev. Lett.* 101 (2008): 268301-. (Academic Article)