Published in Physical Review Fluids with Denis Dumont as first author, the article entitled « Discontinuous shear thickening in dry granular materials induced by non-Coulombian friction » is available here.
Discontinuous shear thickening (DST), extensively studied in dense suspensions, can also occur in dry granular materials when interparticle friction depends on contact force. Using discrete-element simulations, this study shows that introducing a non-Coulombian friction law, mimicking the effect of coatings or lubricants on grain interactions, leads to DST even in the absence of a suspending fluid. A mean-field model is developed that links the microscopic friction law to the bulk rheology, capturing the transition from continuous to discontinuous thickening and offering insights for tuning flow properties in dry industrial powders.
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