Elastic energy, fluctuations and temperature for granular materials
نویسندگان
چکیده
منابع مشابه
Stress Fluctuations for Continuously Sheared Granular Materials.
Experiments on continuously sheared granular materials (glass spheres) with diameters 1.0 # d # 5 mm show large fluctuations in the normal stress, sstd. Experiments are carried out in an annular Couette geometry for rotation rates 0.003 , Ù u , 1 radys. Power spectra from sstd, Psvd, show rate invariance in the fluctuations: Ù uPsvd is a function only of vy Ù u, independent of Ù u. Ù uPsvd depe...
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Abstract: A pulse-echo technique, based on ultrasonic "long-bar" mode (LBM) velocity measurements, working up to 1700°C is described. Magnetostrictive transducers and ultrasonic lines used in a 40-85 kHz frequency range are detailed. The conditions of choice of fundamental parameters (frequency, line geometry, sample size) are discussed in relation with the nature and the microstructure of ...
متن کاملNumerical Simulation of Elastic, Viscoelastic, and Granular Materials
of the Dissertation Numerical Simulation of Elastic, Viscoelastic, and Granular Materials
متن کاملLocal origins of volume fraction fluctuations in dense granular materials.
Fluctuations of the local volume fraction within granular materials have previously been observed to decrease as the system approaches jamming. We experimentally examine the role of boundary conditions and interparticle friction μ on this relationship for a dense granular material of bidisperse particles driven under either constant volume or constant pressure. Using a radical Voronoï tessellat...
متن کاملExperimental measurement of an effective temperature for jammed granular materials.
A densely packed granular system is an example of an out-of-equilibrium system in the jammed state. It has been a longstanding problem to determine whether this class of systems can be described by concepts arising from equilibrium statistical mechanics, such as an effective temperature and compactivity. The measurement of the effective temperature is realized in the laboratory by slowly sheari...
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ژورنال
عنوان ژورنال: Europhysics Letters (EPL)
سال: 2004
ISSN: 0295-5075,1286-4854
DOI: 10.1209/epl/i2004-10061-5