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Relation between dilation and stress fluctuations in discontinuous shear thickening suspensions
We investigate dilation-induced surface deformations in a discontinuous shear thickening (DST) suspension to determine the relationship between dilation and stresses in DST. Video is taken at two observation points on the surface of the suspension in a rheometer while shear and normal stresses are m...
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Published in: | Physical review. E 2021-01, Vol.103 (1-1), p.012603-012603, Article 012603 |
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container_end_page | 012603 |
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container_title | Physical review. E |
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creator | Maharjan, Rijan O'Reilly, Ethan Postiglione, Thomas Klimenko, Nikita Brown, Eric |
description | We investigate dilation-induced surface deformations in a discontinuous shear thickening (DST) suspension to determine the relationship between dilation and stresses in DST. Video is taken at two observation points on the surface of the suspension in a rheometer while shear and normal stresses are measured. A roughened surface of the suspension is observed as particles poke through the liquid-air interface, an indication of dilation in a suspension. These surface roughening events are found to be intermittent and localized spatially. Shear and normal stresses also fluctuate between high- and low-stress states, and surface roughening is observed frequently in the high-stress state. On the other hand, a complete lack of surface roughening is observed when the stresses remain at low values for several seconds. Surface roughening is most prominent while the stresses grow from the low-stress state to the high-stress state, and the roughened surface tends to span the entire surface by the end of the stress growth period. Surface roughening is found only at stresses and shear rates in and above the shear thickening range. These observed relations between surface roughening and stresses confirm that dilation and stresses are coupled in the high-stress state of DST. |
doi_str_mv | 10.1103/PhysRevE.103.012603 |
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title | Relation between dilation and stress fluctuations in discontinuous shear thickening suspensions |
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