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Insight into contact forces in crushable sand using experiments and predictive particle-scale modelling

Harmon, John M. and Seo, Dawa and Buscarnera, Giuseppe and Andrade, José E. (2022) Insight into contact forces in crushable sand using experiments and predictive particle-scale modelling. Géotechnique . ISSN 0016-8505. doi:10.1680/jgeot.21.00212. (In Press) https://resolver.caltech.edu/CaltechAUTHORS:20220715-744256000

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Abstract

In this paper, an attempt is made to predict the evolving statistics of inter-particle contact forces during comminution using grain-scale computational modelling. A validation is first carried out by creating a one-to-one virtual avatar of an Ottawa sand specimen from three-dimensional X-ray tomography with level sets and comparing the data from an oedometric test to the model's prediction. The predictive capabilities are confirmed by comparing the constitutive response, grain size distribution and changes in particle shapes in both the experiment and model. Once validated, the predicted contact forces and particle stresses are investigated. It is found that the largest particles experience the largest forces. Despite larger particles being weaker on average, many survive because they are on the stronger side of the particle strength distribution and also have a higher coordination number producing a more isotropic stress state in the particle. These highest forces are largely aligned with the specimen axis, demonstrating that larger particles provide the strength in the loading direction. Meanwhile forces in the radial direction are more broadly distributed, indicating that small particles play a significant part in providing radial stability.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1680/jgeot.21.00212DOIArticle
ORCID:
AuthorORCID
Andrade, José E.0000-0003-3741-0364
Additional Information:© 2022 ICE Publishing. Manuscript received 27 July 2021; revised manuscript accepted 30 March 2022. This work was supported by a NASA Space Technology Research Fellowship, grant no. 80NSSC19K1160.
Funders:
Funding AgencyGrant Number
NASA Space Technology Research Fellowship80NSSC19K1160
Subject Keywords:discrete-element modelling; fabric/structure of soils; particle crushing/crushability
DOI:10.1680/jgeot.21.00212
Record Number:CaltechAUTHORS:20220715-744256000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220715-744256000
Official Citation:Insight into contact forces in crushable sand using experiments and predictive particle-scale modelling John M. Harmon, Dawa Seo, Giuseppe Buscarnera, and José E. Andrade Géotechnique 0 0:0, 1-12
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115646
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:22 Jul 2022 15:43
Last Modified:22 Jul 2022 15:43

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