Nonlinear Dynamics of Grains in a Liquid-Saturated Soil

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Claes Hedberg
Title: Nonlinear Dynamics of Grains in a Liquid-Saturated Soil
Translated title: Ickelinjär dynamik för korn i vätskemättad jord.
Conference name: Proceedings of 16th International Symposium of Nonlinear Acoustics, August 19-23, 2002, Moscow
Year: 2002
City: Moscow, Russia
Organization: Blekinge Institute of Technology
Department: Dept. of Mechanical Engineering (Institutionen för maskinteknik)
Dept. of Mechanical Engineering S-371 79 Karlskrona
+46 455 38 50 00
http://www.ima.bth.se/
Authors e-mail: claes.hedberg@bth.se
Language: English
Abstract: Known models with huge nonlinear response of grainy media are based on nonlinear stress-strain relationships typical for solids containing mesoscopic inhomogeneities or defects in their structure. Such nonlinear behaviour is well-defined at significant local deformation caused by high applied load, even if the load does not vary in time. However, there exist a different type of nonlinearity which manifests itself due to inertial forces between grains. Such forces appear in a moving noninertial frame of reference, in particular, if a small system of interacting particles is placed into a vibrating fluid. High spatial gradients of internal forces are determined by the non-uniform distribution of mass. These gradients varying in time can excite the internal degrees of freedom. So, even at harmonic vibration of the fluid caused by sound, the nonlinear internal dynamics can be responsible for generation of higher harmonics. As an example of nonlinearity of inertial type, a model of grainy medium is developed where the grains are immersed into a vibrating fluid. The inertial attractive forces have hydrodynamic origin, and the repulsive forces are caused by deformation of colliding grains. Dynamic and stochastic motion is studied, resonances are discovered and nonlinear response is evaluated.
Summary in Swedish: En skillnad i densitet mellan partiklar och vätska gör att partiklar i ett akustiskt fält kommer att röra sig relativt vätskan och kollidera med varandra. Denna sortens ickelinjaritet ger ett starkt stokastiskt och kaotiskt beteende och både högre och lägre oscillationer uppstår.
Subject: Mechanical Engineering\Structural Dynamics
Mechanical Engineering\General
Keywords: nonlinear particle dynamics, fluid-particle vibrations, nonlinear acoustic particle dynamics
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