Results 211 to 220 of about 3,227 (260)

Negative coefficient of normal restitution

Physical Review E, 2012
This paper shows that negative coefficients of normal restitution occur inevitably when the interaction force between colliding particles is finite. We derive an explicit criterion showing that for any set of material properties there is always a collision geometry leading to negative restitution coefficients.
Patric, Müller, Dominik, Krengel, Thorsten, Pöschel   +2 more
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The restitution coefficient: A new interpretation

American Journal of Physics, 1998
The restitution coefficient, used up to now to describe binary inelastic collisions between macroscopic bodies, is interpreted here as a measure of the limiting value of the recoil angle in binary inelastic collisions at microscopic scale. The description of inelastic collisions in terms of this new quantity enables us to dramatically simplify several ...
FALCONE, Giovanni, PIPERNO F.
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A coefficient of restitution of rock materials

Computers & Geosciences, 2008
At a macroscopic scale, even a purely elastic contact between rock particles is accompanied by energy dissipation. The resulting hysteretic loop of the stress/strain path during such a loading and unloading event suggests that grains recover slower to their original shape than when they were first deformed.
B. Imre, S. Räbsamen, S. M. Springman
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Listening to the coefficient of restitution - revisited

American Journal of Physics, 2001
We present a new method for measuring the coefficient of restitution between a steel ball and a flat, smooth surface, based on the recording of sound files with a PC. We demonstrate how a simple and straightforward analysis of the sound files yields the coefficient of restitution as a function of velocity.
Stensgaard, Ivan, Lægsgaard, Erik
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Coefficients of restitution for a collision

Physics Education, 2021
Abstract The coefficient of restitution (COR) for a collision is usually a number between 0 and 1 depending on whether the collision is completely inelastic, or perfectly elastic or something in between. That is the usual situation for colliding spheres or a ball dropped on a horizontal surface. A different situation arises when a bat
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Coefficient of Restitution of Coals

Nature, 1945
In a previous note1 it was mentioned that mechanical properties are involved in the Stopes' classification of the petrological constituents of coals2, and they are of interest in any general study of the physical properties of coals. Much of the previous work on this subject has been undertaken from the point of view of mechanical failures in mines, or
C. G. CANNON, W. H. GEORGE
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Coefficient Of Restitution

2004
Abstract This chapter derives the coefficient of restitution from the interaction forces. It shows that the coefficient is not a material constant but rather depends on impact velocity. An analytic expression for the coefficient of restitution of viscoelastic spheres is derived.
Nikolai V. Brilliantov, Thorsten Pöschel   +1 more
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Stochastic behavior of the coefficient of normal restitution

Physical Review E, 2014
We consider the collision of a rough sphere with a plane by detailed analysis of the collision geometry. Using stochastic methods, the effective coefficient of restitution may be described as a fluctuating quantity whose probability density follows an asymmetric Laplace distribution. This result agrees with recent experiments by Montaine et al.
Nina, Gunkelmann, Marina, Montaine, Thorsten, Pöschel   +2 more
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Coefficient of restitution mediated by a diamagnetic interaction

The European Physical Journal E, 2016
We study how a magnetic bead bounces onto a horizontal diamagnetic conducting plane. The bead, falling down by gravity from a certain height, produces an Eddy current that creates a repelling force. For low velocities the bead is trapped by the surface, for intermediate ones it escapes.
A J, Batista-Leyva, J C, Ruiz-Suárez
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Coefficient of tangential restitution for viscoelastic spheres

The European Physical Journal E, 2008
The collision of frictional granular particles may be described by an interaction force whose normal component is that of viscoelastic spheres while the tangential part is described by the model by Cundall and Strack (Géotechnique 29, 47 (1979)) being the most popular tangential collision model in Molecular Dynamics simulations.
T, Schwager, V, Becker, T, Pöschel
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