Results 71 to 80 of about 2,739 (118)

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 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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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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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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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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Simulation Modelling of Coefficient of Restitution [PDF]

, 2022
This article discusses types of mills, used to reduce the size of grinding materials. An analysis of methods for determining the restitution coefficient was made, after that a method for determining the restitution coefficient was chosen. Input parameters have been experimentally determined, enabling proper modeling and simulation.
Stoimenov, Nikolay, Paneva, Miglena, Kotseva, Gabriela, Sokolov, Blagoy   +3 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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Evaluation of Rockfall Restitution Coefficients

2015
Restitution coefficients for various slope surfaces affected by extensive rockfalls are proposed from back–analysis calculations that have been carried out in several sites of the Western Greece. These occurrences have been thoroughly studied in order to investigate the extent of the events, assess the hazard and propose protective measures.
N Sabatakakis, N Depountis, N Vagenas
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Coefficient of restitution for bouncing nanoparticles

Physical Review B, 2010
We demonstrate the measurement of the coefficient of restitution, $e$, for nanoparticles, through observations of the final distribution of bismuth particles that have bounced within silicon V-grooves. The experiments, taken together with complementary molecular-dynamics simulations, show that $e$ is generally smaller for liquid than for solid ...
A. I. Ayesh, S. A. Brown, A. Awasthi, S. C. Hendy, P. Y. Convers, K. Nichol   +5 more
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Investigations of the Restitution Coefficient of Granules

2008
The energy adsorption during the normal and oblique impacts of different spherical granules (γ-Al2O3, zeolite 4A, sodium benzoate) has been experimentally studied. Free-fall tests have been carried out to obtain the normal and tangential restitution coefficients that characterise the energy losses durizng loading and unloading.
Müller, Peter, Antonyuk, Sergiy, Tomas, Jürgen, Heinrich, Stefan   +3 more
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