Representation of crushing phenomenon in DEM model of railway ballast

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F14%3APU112810" target="_blank" >RIV/00216305:26110/14:PU112810 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Representation of crushing phenomenon in DEM model of railway ballast
Original language description
Representation of ballast behaviour in Discrete Element Models (DEM) would not be complete without including crushing of grains. Two approaches have been developed in literature. The first one represents every grain as an assembly of smaller units with cohesive contacts between them. This approach is relatively precise and universal, but it demands extreme computational resources. The other approach is exploited here. Every grain is modelled as one rigid body. The crushing occurs when some equivalent stress in the grain, here determined as von Mises stress computed from fabric stress tensor, exceeds the material strength. The grain is then replaced by several smaller bodies, pieces. These pieces must often have the same shape as the original grain (typically spherical) and their assembly therefore cannot be created in exactly the shape of the original grain. The effects of number of pieces and their properties are studied.
Czech name
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Czech description
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Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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