Contents 2016b - Revision history

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Complascontents: Complascontents moved page Draft Contents 671174393 to Contents 2016b

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 ==Abstract==
-The mechanical behavior of granular materials is characterized by strong non-linearity and irreversibility. These properties have been described by a variety of constitutive models, a large proportion of them are developed within an elasto-plastic framework. On top of the usual grain rearrangement mechanism, the presence of crushable grains adds one extra source of irreversibility to granular materials, a source that is frequently associated with instabilities. In his context, it is very instructive to obtain incremental responses of crushable granular materials but the experimental difficulties are formidable. This contribution describes a procedure to obtain incremental responses of this type of materials using the discrete element method.
+The mechanical behavior of granular materials is characterized by strong non-linearity and irreversibility. These properties have been described by a variety of constitutive models, a large proportion of them are developed within an elasto-plastic framework. On top of the usual grain rearrangement mechanism, the presence of crushable grains adds one extra source of irreversibility to granular materials, a source that is frequently associated with instabilities. In his context, it is very instructive to obtain incremental responses of crushable granular materials but the experimental difficulties are formidable [<span id='cite-1'></span>[[#1|1]]]. This contribution describes a procedure to obtain incremental responses of this type of materials using the discrete element method [<span id='cite-2'></span>[[#2|2]]].
-The DEM model is calibrated to represent Fontaineblau sand. The resulting granular assembly is incrementally tested starting from an initial oedometric (no lateral deformation) condition. The incremental behavior of the numerical models is studied by performing axisymmetric stress probes of equal magnitude but varying direction. Recent advances to enhance the efficiency of the numerical procedure are adopted. The cascading nature of crushing events complicates stress probe control but damping is effectively used to overcome this problem.
+The DEM model is calibrated to represent Fontaineblau sand. The resulting granular assembly is incrementally tested starting from an initial oedometric (no lateral deformation) condition. The incremental behavior of the numerical models is studied by performing axisymmetric stress probes of equal magnitude but varying direction. Recent advances to enhance the efficiency of the numerical procedure are adopted [<span id='cite-3'></span>[[#3|3]]]. The cascading nature of crushing events complicates stress probe control but damping is effectively used to overcome this problem.
 The contribution of grain crushing to the incremental irreversible strain is identified and separately measured. Three components of the incremental strains are distinguished: elastic, plastic-unbreakable and plastic-crushing. Particular focus is placed on the effects of crushing on the direction of plastic flow.
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 * [//congress.cimne.com/complas2015/frontal/default.asp Complas XIII] Official Website of the Conference.
 * [//www.cimnemultimediachannel.com/ CIMNE Multimedia Channel]

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 {| style="font-size:120%; color: #222222; border: 1px solid darkgray; background: #f3f3f3; table-layout: fixed; width:100%;"
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 | {{#evt:service=youtube|id=https://www.youtube.com/watch?v=CksqiT00w9U|alignment=center}}
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 | Date: 1 - 3 September 2015, Barcelona, Spain.
 |}
 == General Information ==
 * Location: Technical University of Catalonia (UPC), Barcelona, Spain.
 * Date: 1 - 3 September 2015
-* Secretariat: [//www.cimne.com/ CIMNE] Centre Internacional de Metodes Numerics.
+* Secretariat: [//www.cimne.com/ International Center for Numerical Methods in Engineering (CIMNE)].
 == External Links ==
 * [//congress.cimne.com/complas2015/frontal/default.asp Complas XIII] Official Website of the Conference.
 * [//www.cimnemultimediachannel.com/ CIMNE Multimedia Channel]

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 | {{#evt:service=youtube|id=https://www.youtube.com/watch?v=CksqiT00w9U|alignment=center}}
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-{| class="wikitable" style="margin-left: auto; margin-right: auto; border: none;"
+{| style="font-size:120%; color: #222222; border: 1px solid darkgray; background: #f3f3f3; table-layout: fixed; width:100%;"
-|-
+|- style="border-bottom: 1px solid darkgray; text-align: center;"
-! Recording of the presentation
+| Recording of the presentation
 |-
-| <embedvideo service="youtube">https://www.youtube.com/watch?v=CksqiT00w9U</embedvideo>
+| {{#evt:service=youtube|id=https://www.youtube.com/watch?v=CksqiT00w9U|alignment=center}}
 |}

← Older revision		Revision as of 07:10, 10 June 2016
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−	The mechanical behavior of crushable granular materials is characterized by strong non-linearity and irreversibility. In this paper, the incremental behavior of crushable granular soils is investigated by numerically simulating three dimensional stress probing experiments on Distinct Element models consisting of a random assembly of spheres. Particle breakage is permitted and the initial high stress condition ensures that crushing will occur along some of the loading directions. The results obtained show that particle crushing considered as an additional source of plastic mechanism induces a change in the direction of the plastic flow and that this direction change is independent of the incremental loading path. This result is independent of damping and the magnitude of plastic strains tends towards an asymptotic value as damping increases.
−
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← Older revision		Revision as of 10:22, 9 June 2016
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	The mechanical behavior of crushable granular materials is characterized by strong non-linearity and irreversibility. In this paper, the incremental behavior of crushable granular soils is investigated by numerically simulating three dimensional stress probing experiments on Distinct Element models consisting of a random assembly of spheres. Particle breakage is permitted and the initial high stress condition ensures that crushing will occur along some of the loading directions. The results obtained show that particle crushing considered as an additional source of plastic mechanism induces a change in the direction of the plastic flow and that this direction change is independent of the incremental loading path. This result is independent of damping and the magnitude of plastic strains tends towards an asymptotic value as damping increases.		The mechanical behavior of crushable granular materials is characterized by strong non-linearity and irreversibility. In this paper, the incremental behavior of crushable granular soils is investigated by numerically simulating three dimensional stress probing experiments on Distinct Element models consisting of a random assembly of spheres. Particle breakage is permitted and the initial high stress condition ensures that crushing will occur along some of the loading directions. The results obtained show that particle crushing considered as an additional source of plastic mechanism induces a change in the direction of the plastic flow and that this direction change is independent of the incremental loading path. This result is independent of damping and the magnitude of plastic strains tends towards an asymptotic value as damping increases.
−
−	~~'''keywords''' Discrete element method, granular materials, incremental non linearity, particle crushing.~~
−

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← Older revision		Revision as of 14:53, 7 June 2016
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−	~~''Antonio Gens<sup>1</sup>, Matteo O. Ciantia<sup>1</sup>, and Marcos Arroyo<sup>1</sup>''~~
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−	{\|
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−
−	\|}
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−	{\|
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−	~~\|(<sup>1</sup>) Department of Geotechnical Engineering and Geosciences (ETCG)~~
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−	~~\| Universidad Politécnica de Cataluña~~
−	\|-
−	~~\| Campus Nord UPC, 08034 Barcelona, Spain~~
−	\|}
−
−	~~==Abstract==~~
	The mechanical behavior of crushable granular materials is characterized by strong non-linearity and irreversibility. In this paper, the incremental behavior of crushable granular soils is investigated by numerically simulating three dimensional stress probing experiments on Distinct Element models consisting of a random assembly of spheres. Particle breakage is permitted and the initial high stress condition ensures that crushing will occur along some of the loading directions. The results obtained show that particle crushing considered as an additional source of plastic mechanism induces a change in the direction of the plastic flow and that this direction change is independent of the incremental loading path. This result is independent of damping and the magnitude of plastic strains tends towards an asymptotic value as damping increases.		The mechanical behavior of crushable granular materials is characterized by strong non-linearity and irreversibility. In this paper, the incremental behavior of crushable granular soils is investigated by numerically simulating three dimensional stress probing experiments on Distinct Element models consisting of a random assembly of spheres. Particle breakage is permitted and the initial high stress condition ensures that crushing will occur along some of the loading directions. The results obtained show that particle crushing considered as an additional source of plastic mechanism induces a change in the direction of the plastic flow and that this direction change is independent of the incremental loading path. This result is independent of damping and the magnitude of plastic strains tends towards an asymptotic value as damping increases.

← Older revision	Revision as of 11:17, 7 June 2016
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-''Antonio Gens<sup>1</sup>, Matteo O. Ciantia<sup>1</sup>, and Marcos Arroyo<sup>1</sup>'''
+''Antonio Gens<sup>1</sup>, Matteo O. Ciantia<sup>1</sup>, and Marcos Arroyo<sup>1</sup>''
 {|
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 ==Abstract==
- The mechanical behavior of crushable granular materials is characterized by strong non-linearity and irreversibility. In this paper, the incremental behavior of crushable granular soils is investigated by numerically simulating three dimensional stress probing experiments on Distinct Element models consisting of a random assembly of spheres. Particle breakage is permitted and the initial high stress condition ensures that crushing will occur along some of the loading directions. The results obtained show that particle crushing considered as an additional source of plastic mechanism induces a change in the direction of the plastic flow and that this direction change is independent of the incremental loading path. This result is independent of damping and the magnitude of plastic strains tends towards an asymptotic
+The mechanical behavior of crushable granular materials is characterized by strong non-linearity and irreversibility. In this paper, the incremental behavior of crushable granular soils is investigated by numerically simulating three dimensional stress probing experiments on Distinct Element models consisting of a random assembly of spheres. Particle breakage is permitted and the initial high stress condition ensures that crushing will occur along some of the loading directions. The results obtained show that particle crushing considered as an additional source of plastic mechanism induces a change in the direction of the plastic flow and that this direction change is independent of the incremental loading path. This result is independent of damping and the magnitude of plastic strains tends towards an asymptotic value as damping increases.
 value as damping increases.
 '''keywords''' Discrete element method, granular materials, incremental non linearity, particle crushing.