Shear flow of cohesive powders with contact crystallization: experiment, model and calibration

Weuster, Alexander; Strege, S.; Brendel, Lothar; Zetzener, Harald; Wolf, Dietrich E.; Kwade, Arno

doi:10.1007/s10035-015-0555-3

Cited by 10 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the cumbersome work of measuring every parameter experimentally can be circumvented by utilizing microscopically undetermined parameters to calibrate the contact model. This enables a correct description of the bulk's macroscale behavior [10], e.g. stress response to applied strain.…”

Section: Parameters and Calibrationmentioning

confidence: 99%

“…Calibration of the contact model is done by executing plane shear simulations under variation of μ at a fixed normal stress σ = 15 kPa and comparing the steady state macroscopic friction coefficient μ macro to the experimental findings. These calibration simulations are done with N = 10.000 particles, confining walls perpendicular to the shear direction and periodic boundary conditions in all other directions (see [3,10] for details). Fitting an exponential saturating function for μ macro (μ) as suggested in [11] results in μ ≈ 0.58.…”

Section: Parameters and Calibrationmentioning

confidence: 99%

See 1 more Smart Citation

Mesostructural investigation of micron-sized glass particles during shear deformation – An experimental approach vs. DEM simulation

et al. 2017

View full text Add to dashboard Cite

The interdependency of structure and mechanical features of a cohesive powder packing is on current scientific focus and far from being well understood. Although the Discrete Element Method provides a well applicable and widely used tool to model powder behavior, non-trivial contact mechanics of micron-sized particles demand a sophisticated contact model. Here, a direct comparison between experiment and simulation on a particle level offers a proper approach for model validation. However, the simulation of a full scale sheartester experiment with micron-sized particles, and hence, validating this simulation remains a challenge. We address this task by down scaling the experimental setup: A fully functional micro shear-tester was developed and implemented into an X-ray tomography device in order to visualize the sample on a bulk and particle level within small bulk volumes of the order of a few micro liter under well-defined consolidation. Using spherical micron-sized particles (30 μm), shear tests with a particle number accessible for simulations can be performed. Moreover, particle level analysis allows for a direct comparison of experimental and numerical results, e.g., regarding structural evolution. In this talk, we focus on density inhomogeneity and shear induced heterogeneity during compaction and shear deformation.

show abstract

Section: Parameters and Calibrationmentioning

confidence: 99%

Section: Parameters and Calibrationmentioning

confidence: 99%

Mesostructural investigation of micron-sized glass particles during shear deformation – An experimental approach vs. DEM simulation

et al. 2017

View full text Add to dashboard Cite

show abstract

“…the extension of Darcy's law [1,[12][13][14][15][16][17][18], the second competing goal of multiscale modelling is often neglected, which is the reduction of complexity. On the one hand, for instance, modern numerical and experimental techniques allow a detailed investigation of microscale phenomena [19][20][21][22][23][24] and the set S macro increases to explain novel explorations. On the other hand, large amounts of data and time restrictions during experiments require an efficient process to filter out unnecessary information.…”

Section: Introductionmentioning

confidence: 99%

The criterion of subscale sufficiency and its application to the relationship between static capillary pressure, saturation and interfacial areas

Kurzeja

2016

Proc. R. Soc. A.

View full text Add to dashboard Cite

Modern imaging techniques, increased simulation capabilities and extended theoretical frameworks, naturally drive the development of multiscale modelling by the question: which new information should be considered? Given the need for concise constitutive relationships and efficient data evaluation; however, one important question is often neglected: which information is sufficient? For this reason, this work introduces the formalized criterion of subscale sufficiency. This criterion states whether a chosen constitutive relationship transfers all necessary information from micro to macroscale within a multiscale framework. It further provides a scheme to improve constitutive relationships. Direct application to static capillary pressure demonstrates usefulness and conditions for subscale sufficiency of saturation and interfacial areas.

show abstract

Structure of Sheared Cohesive Granular Bulk

Brendel

Weuster

Wolf

et al. 2019

Particles in Contact

View full text Add to dashboard Cite

Shear flow of cohesive powders with contact crystallization: experiment, model and calibration

Cited by 10 publications

References 48 publications

Mesostructural investigation of micron-sized glass particles during shear deformation – An experimental approach vs. DEM simulation

Mesostructural investigation of micron-sized glass particles during shear deformation – An experimental approach vs. DEM simulation

The criterion of subscale sufficiency and its application to the relationship between static capillary pressure, saturation and interfacial areas

Structure of Sheared Cohesive Granular Bulk

Contact Info

Product

Resources

About