Analysis of constant-volume shear tests based on precise measurement of stresses in powder beds

Shimada, Yasuhiro; Kawata, Takumu; Matsusaka, Shuji

doi:10.1016/j.apt.2018.02.033

Cited by 16 publications

(2 citation statements)

References 25 publications

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“…More recently, Shimada et al (2018a;2018b) developed a new device to evaluate flowability using a constantvolume shear tester. The methodology aims at providing continuous measurement of shear stress from a high consolidation point under no shear (σ cvt ,0), through the steady-state flow reference state (σ pr ,τ pr ) until the point at zero normal stress (C,0).…”

Section: Jenike Type Translational Testersmentioning

confidence: 99%

From Quasi-static to Intermediate Regimes in Shear Cell Devices: Theory and Characterisation

Francia

Yahia

Ocone

et al. 2021

KONA

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The design of new technology for processing and manufacturing particulate products requires understanding granular rheology over a broad range of conditions. Powders display a complex behaviour due to their ability to rearrange under stress, and as a result, granular flow is generally classified into three flow regimes, namely a quasi-static regime dominated by frictional contacts, an inertial regime dominated by collisional and kinematic stresses and an intermediate regime where the three sources of stress are important to establish a stress-strain rate relationship. Characterisation of the flowability is generally restricted to the flow initiation in quasi-static regime, even if, transition into inertial conditions is very common in practical applications involving the control of dense flows, such as powder handling, particle formation processes or additive manufacturing. This work presents a critical review of available techniques to characterise the departure from the quasi-static regime into an intermediate flow. We revise the application of shear cells and present different strategies to modify classic devices with external actuation, such as aeration, to operate at higher inertial numbers. We pay particular attention to innovative designs using aerated Couette flow configurations, highlight the complexity in the standardisation and the challenges in advancing towards a universal model.

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Section: Jenike Type Translational Testersmentioning

confidence: 99%

From Quasi-static to Intermediate Regimes in Shear Cell Devices: Theory and Characterisation

Francia

Yahia

Ocone

et al. 2021

KONA

View full text Add to dashboard Cite

show abstract

“…Another type of shear tester is the constant -volume shear tester with a lower movable shear mechanism, as reported by Y. Shimada et al, 2018 [ 45 ]. The proposed method of evaluation allowed to obtain powder yield locus, consolidation yield locus, critical state line, shear cohesion, powder bed void fraction, and stress transmission ratio by with a single shear test [ 46 ]. In order to overcome these difficulties variety of automated and computer-controlled shear cell techniques have been proposed which include uniaxial, biaxial and triaxial compression testers, rotational ring shear cells like FT4 rheometer, Schulze, and most recently powder flow tester (Brookfield PFT).…”

Section: Introductionmentioning

confidence: 99%