Slow and intermittent stress relaxation of biomass granular media

Published on Jul 5, 2021in Epj Web of Conferences
· DOI :10.1051/EPJCONF/202124908010
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#1Kieran A. Murphy (U of C: University of Chicago)H-Index: 4
#2Jonathon W. Kruppe (U of C: University of Chicago)H-Index: 1
Last. Heinrich M. Jaeger (U of C: University of Chicago)H-Index: 78
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We demonstrate experimentally that a granular packing of glass spheres is capable of storing memory of multiple strain states in the dynamic process of stress relaxation. Modeling the system as a non-interacting population of relaxing elements, we find that the functional form of the predicted relaxation requires a quantitative correction which grows in severity with each additional memory and is suggestive of interactions between elements. Our findings have implications for the broad class of s...
3 CitationsSource
#1Robert Junga (Opole University of Technology)H-Index: 6
#2Janusz Pospolita (Opole University of Technology)H-Index: 9
Last. Patrycja Niemiec (Opole University of Technology)H-Index: 3
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Abstract The main goal of this paper is the evaluation of combustion and grindability of torrefied palm kernel shells (PKS) obtained in a pilot-scale installation. The torrefied samples were prepared in different time conditions and temperatures, ranged from 220 to 300 °C. The physico-chemical properties were identified. Thermogravimetric analyses (TG-DTA) were used for characterization of the combustion performance and evaluation of the activation energy E α . The grindability of the pre-treate...
10 CitationsSource
#1John Pachón-Morales (Université Paris-Saclay)H-Index: 4
#2Julien Colin (Université Paris-Saclay)H-Index: 7
Last. Patrick Perré (Université Paris-Saclay)H-Index: 39
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Flowability characterization of milled lignocellulosic biomass is essential for developing viable conveying, storing and handling solutions for gasification processes. This study investigated the effect of torrefaction on particles size and shape obtained after grinding and on flow properties of pulverized wood. Spruce and poplar samples with six torrefaction intensities were knife-milled to obtain biomass powders. Particles size and shape distribution were assessed using a morphological particl...
10 CitationsSource
#2Thierry MelkiorH-Index: 1
Last. Alain de Ryck (ENSMP: Mines ParisTech)H-Index: 12
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The objectives of this work are to determine accurately the cohesion of biomass powders from simple measures and to propose a new method for the description of the yield locus of powders with easy to measure parameters. The cohesion of 32 powders (wood, other biomasses and inorganic powders) have been analysed with two methods. The first method is the determination of the yield locus from shear tests at 3 kPa, performed with a powder rheometer, which gives an access to parameters such as cohesio...
5 CitationsSource
#1Olukayode Isaiah Imole (UT: University of Twente)H-Index: 7
#2M. Paulick (Braunschweig University of Technology)H-Index: 3
Last. Stefan Luding (UT: University of Twente)H-Index: 63
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We present uniaxial (oedometric) compression tests on two cohesive industrially relevant granular materials (cocoa and limestone powder). A comprehensive set of experiments is performed using two devices – the FT4 Powder Rheometer and the custom made lambdameter – in order to investigate the dependence of the powders' behavior on the measurement cell geometries, stress level, relaxation time and applied strain rate. The aspect ratio α, tested with the FT4, is found to play no role for vessels wi...
11 CitationsSource
(Received 31 January 2012; revised manuscript received 19 July 2013; published 27 September 2013)This article deals with the characterization, using an acoustic technique, of the mechanical behavior of adrydensegranularmediumunderquasistaticloading.Ultrasoundpropagationthroughthecontact-forcenetworksupportingtheexternalloadoffersanoninvasiveprobeoftheviscoelasticpropertiesofsuchheterogeneousmedia.First the response of a glass bead packing is studied in an oedometric configuration during creep and...
5 CitationsSource
#1Ariel Amir (Weizmann Institute of Science)H-Index: 22
#2Yuval OregH-Index: 55
Last. Yoseph ImryH-Index: 64
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Slow relaxation occurs in many physical and biological systems. “Creep” is an example from everyday life. When stretching a rubber band, for example, the recovery to its equilibrium length is not, as one might think, exponential: The relaxation is slow, in many cases logarithmic, and can still be observed after many hours. The form of the relaxation also depends on the duration of the stretching, the “waiting time.” This ubiquitous phenomenon is called aging, and is abundant both in natural and ...
74 CitationsSource
#1Jasna BrujicH-Index: 24
#2Ping Wang (CUNY: City University of New York)H-Index: 4
Last. Hernán A. Makse (CUNY: City University of New York)H-Index: 64
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Elastic and dissipative properties of granular assemblies under uniaxial compression are studied both experimentally and by numerical simulations. Following a novel compaction procedure at varying oscillatory pressures, the stress response to a step-strain reveals an exponential relaxation followed by a slow logarithmic decay. Simulations indicate that the latter arises from the coupling between damping and collective grain motion predominantly through sliding. We characterize an analogous "glas...
49 CitationsSource
#1A. de Ryck (ENSMP: Mines ParisTech)H-Index: 3
#2Rodrigo Condotta (ENSMP: Mines ParisTech)H-Index: 5
Last. M. Lubert (Ecole nationale supérieure des mines de Saint-Étienne)H-Index: 1
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The response of a granular material during a stop-and-go shear experiment is investigated using an annular shear cell and silicagel powders of different particle sizes. The experimental results are examined on the basis of the Dieterich-Rice-Ruina model for solid friction. In addition to making this analogy with solid friction, we describe a new instability that is observed when restarting shear, where the powder bed is found to slip and compact for short hold times but only dilates for long hol...
6 CitationsSource
#1R. R. Hartley (Duke University)H-Index: 5
#2Robert Behringer (Duke University)H-Index: 63
Many models of slow, dense granular flows1,2,3,4,5 assume that the internal stresses are independent of the shearing rate. In contrast, logarithmic rate dependence is found in solid-on-solid friction6,7,8, geological settings9,10,11 and elsewhere12,13,14,15. Here we investigate the rate dependence of stress in a slowly sheared two-dimensional system of photoelastic disks, in which we are able to determine forces on the granular scale. We find that the mean (time-averaged) stress displays a logar...
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