Shear rate thickening flow behavior of semisolid slurries

Kumar, Pratyush; Martín, Christophe; Brown, Stuart B.

doi:10.1007/bf02657241

Cited by 69 publications

(53 citation statements)

References 13 publications

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“…The shear rate range for the experiments by Kumar and co-workers [23,27] is higher than that for the experiments by Koke and Modigell [25,28] and Liu et al [24] (and higher shear rate ranges would be expected to exacerbate shear rate thickening if it is due to hydrodynamics or dilatation). However, the latter two sets of experiments overlap in their shear rate ranges but are still apparently contradictory according to their authors.…”

Section: A Factors Which Might Explain the Discrepancies And Contradmentioning

confidence: 71%

“…[30] Kumar et al [23,27] and Koke and Modigell [25,28] (with further analysis of Reference 28 by Burgos et al [29] ) find their material to be shear thickening during the transient, Quaak [22] and Liu et al [24] observe the material is shear thinning. Peng and Wang [26] study the behavior but do not state a conclusion.…”

Section: F Aim Of the Papermentioning

confidence: 98%

“…Kumar et al [23] evaluate this to be of the order of seconds but Liu et al [24] find it to be in the region of~0.16 s (their Table I). The time for the transient in shear rate is of the order of 10 ms in Kumar et al [23] and 100 ms in Liu et al [24] thus satisfying this requirement. The timescale for the transient in Koke and Modigell [25] is not stated but is short.…”

Section: Connection With Discontinuous Shear Thickening In Dense Smentioning

confidence: 99%

“…There is contradictory evidence in the literature [22][23][24][25][26][27][28][29] as to whether the behavior during rapid increases in shear rate is shear thinning or shear thickening, although it is clear that once in the die the material is thinning. [30] Kumar et al [23,27] and Koke and Modigell [25,28] (with further analysis of Reference 28 by Burgos et al [29] ) find their material to be shear thickening during the transient, Quaak [22] and Liu et al [24] observe the material is shear thinning.…”

Section: F Aim Of the Papermentioning

confidence: 99%

“…However, the latter two sets of experiments overlap in their shear rate ranges but are still apparently contradictory according to their authors. In terms of fraction solid, Kumar et al [23,27] give results for 0.45 and above, Peng and Wang [26] for 0.2 through to 0.5, Koke and Modigell [25] for 0.41 and above, and Liu et al [24] for 0.36 and 0.5. For fractions solid of 0.36 and less, the spheroids are quite widely separated and may well be less susceptible to clustering and jamming than for the higher fractions of solid.…”

Section: A Factors Which Might Explain the Discrepancies And Contradmentioning

confidence: 99%

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Does Shear Thickening Occur in Semisolid Metals?

Atkinson

Favier

2016

Metall Mater Trans A

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In the various forms of semisolid processing such as thixoforming and thixoforging, the entry into the die occurs in a fraction of a second so it is the transient rheological behavior which governs the initial stages of flow. In experiments in the literature, this rheological behavior is probed through applying rapid transitions in shear rate under isothermal conditions. There is contradictory evidence as to whether the behavior during these transitions is shear thinning or shear thickening, although it is clear that once in the die the material is thinning. Here the data in the literature are reanalyzed to obtain a rationalization of the contradictions which has not previously been available. It is argued that if a suspension is initially in a disagglomerated state (i.e., one which is initially sheared), the instantaneous behavior with a jump-up in shear rate is shear thickening (even if the long-term steady-state behavior is shear thinning) provided the fraction solid is greater than about 0.36 and the final shear rate at the end of the jump is greater than about 100 s À1 . If the jump-up in shear rate is made from rest then yield masks the shear thickening.

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