000004723 001__ 4723
000004723 005__ 20141119144548.0
000004723 04107 $$aeng
000004723 046__ $$k2002-06-02
000004723 100__ $$aKuhn, Matthew R.
000004723 24500 $$aPARTICLE ROTATIONS IN GRANULAR MATERIALS

000004723 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004723 260__ $$bColumbia University in the City of New York
000004723 506__ $$arestricted
000004723 520__ $$2eng$$aParticle rotations can have a dominant influence on the behavior of granular materials, particularly in materials with circular or spherical particles. The paper briefly reviews experimental evidence of the magnitude and variability of particle rotations and their effect on a granular material’s stiffness and strength. Evidence of rotational patterning is reported from DEM simulations of a large square assembly of multi-sized circular particles. The translational velocities of the particles were used to compute the rotation and deformation rates within small polygonal regions of material. The material rotation could then be compared with the rotations of the particles themselves. Two meso-scale phenomena are described in the paper: rotating clusters and rotation chains. During biaxial tests, the local deformation rates are highly variable, with banded regions having deformation rates much greater than the mean rate, and with clustered regions in which very little deformation occurs. Material within a nearly-rigid region usually rotates in either an entirely clockwise or entirely counter-clockwise manner. The direction of this material rotation matches the direction of particle rotations in these regions. In a second rotational pattern, the most rapidly rotating particles are aligned in chain-like patterns oblique to the principal stress directions. These rotation chains are usually located within intensely deforming band-like regions.

000004723 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004723 653__ $$a

000004723 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004723 720__ $$aKuhn, Matthew R.$$iBagi, Katalin
000004723 8560_ $$ffischerc@itam.cas.cz
000004723 8564_ $$s976071$$uhttps://invenio.itam.cas.cz/record/4723/files/230.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004723 962__ $$r4594
000004723 980__ $$aPAPER