Numerical and experimental investigation of yielding for cohesive dry powder

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Abstract

We study the effect of particle cohesion on the steady state shear strength of a granular material. For cohesive powders, the steady state shear loci (termination loci) from DEM simulations are nonlinear with a peculiar pressure dependence due to the non-linear increase of contact adhesion with pressure in the contact model. Physical experiments are carried out on fine limestone powder in the direct shear box to validate the interesting non-linearity in the material behavior, as detected by the simulations and to provide a basis for calibration of DEM. In order to enhance the reproducibility, the standard test procedure from Jenike shear tester is ameliorated for the direct shear tester. Finally, the difference between the yield (transition from static to flow) and the steady state shear stress (required to maintain shear motion) will be addressed
Original languageEnglish
Title of host publicationProceedings 8th Int. Conference for Conveying and Handling of Particulate Solids (CHOPS 2015)
EditorsH. Kalman, A. Levy
Place of PublicationTel-Aviv, Israel
PublisherORTRA
Pages1-9
Publication statusPublished - 3 May 2015
Event8th International Conference for Conveying and Handling of Particulate Solids, CHoPS 2015 - Dan Panorama Hotel, Tel-Aviv, Israel
Duration: 3 May 20157 May 2015
Conference number: 8

Publication series

Name
PublisherORTRA

Conference

Conference8th International Conference for Conveying and Handling of Particulate Solids, CHoPS 2015
Abbreviated titleCHoPS
CountryIsrael
CityTel-Aviv
Period3/05/157/05/15

Keywords

  • METIS-311002
  • IR-96574

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  • Cite this

    Shi, H., Singh, A., Luding, S., & Magnanimo, V. (2015). Numerical and experimental investigation of yielding for cohesive dry powder. In H. Kalman, & A. Levy (Eds.), Proceedings 8th Int. Conference for Conveying and Handling of Particulate Solids (CHOPS 2015) (pp. 1-9). Tel-Aviv, Israel: ORTRA.