Stress distribution in a powder column under uniaxial compression

Thomas, Amalia; Clayton, Jamie

doi:10.1016/j.powtec.2022.117768

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…The FT4 rheometer has been used extensively in studying the flow differences in various powders [41][42][43][44]. It proved to be an effective tool for understanding the role of moisture in the flow behavior of corn meal, wheat farina, and granulated sugar.…”

Section: Discussionmentioning

confidence: 99%

Flow Properties of Coarse Powders Used in Food Extrusion as a Function of Moisture Content

McGuire,

Siliveru,

Chakraborty

et al. 2024

Processes

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The extrusion processing of food powder relies heavily on its moisture content to aid in flow and proper cooking, shaping, and/or puffing. This study focused on the impact of the moisture content on the dynamic flow and shear properties of coarse food powders (corn meal, wheat farina, and granulated sugar). The dynamic flow properties explored were the specific basic flowability energy (SBFE), specific energy, stability index, and flow rate index. The shear properties were the angle of internal friction, unconfined yield strength, major principal stress, wall friction angle, flow factor (FF), and compressibility. Corn meal exhibited an increase in SBFE as the moisture content increased (6.70 mJ/g at 13.13% to 9.14 mJ/g at 19.61%) but no change in FF (4.94 to 5.11); wheat farina also showed an increase in energy requirement as the moisture increased (5.81 mJ/g at 13.73% to 9.47 mJ/g 19.57%) but a marked decrease in FF ratings (18.47 to 6.1); granulated sugar showed a decrease in energy requirements as the moisture increased (51.73 mJ/g at 0.06% moisture content to 13.58 mJ/g at 0.78% moisture content) and a decrease in FF ratings (8.53 to 3.47). Overall, upon the addition of moisture, corn meal became cohesive yet free-flowing; wheat farina became less compressible and more cohesive; and granulated sugar became more cohesive and compressible and less free-flowing.

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Section: Discussionmentioning

confidence: 99%

Flow Properties of Coarse Powders Used in Food Extrusion as a Function of Moisture Content

McGuire,

Siliveru,

Chakraborty

et al. 2024

Processes

View full text Add to dashboard Cite

show abstract

“…Considering the linear relationship between these two stresses (Equation ), the proposed model can be verified simply by measuring normal stress distribution. To precisely measure the numerical and regional distribution of normal stress (pressure), the pressure‐sensitive film was used 21,50 . This film can indicate the pressure by the color intensity, and the values of the pressure can be obtained by the color calibration.…”

Section: Methodsmentioning

confidence: 99%

“…To precisely measure the numerical and regional distribution of normal stress (pressure), the pressure-sensitive film was used. 21,50 This film can indicate the pressure by the color intensity, and the values of the pressure can be obtained by the color calibration. The specification of the film adopted in this test is LLLW, which can be used to measure ultralow pressure below 0.6 MPa.…”

Section: Verification Of the Contact Modelmentioning

confidence: 99%

Modeling of contact mechanics and defects investigation in automated fiber placement

Miao,

Zhu,

Guo

et al. 2024

Polymer Composites

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The layup quality of prepreg fibers onto complex surfaces is the most concerned issue in automated fiber placement (AFP), which is intimately related to the contact stress in tractive rolling contact. An analytical model of tractive rolling contact is proposed in this paper to clarify the defects mechanism during the AFP process, which considers the mold curvatures, mechanical properties of contacted objects, and pose information to make it suitable for irregular surfaces and arbitrary conditions. Classical Hertz theory in this model is expanded to 3D contact area, and multi‐scale deformations are united in the accurate calculation of contact stress under geometric constraints. Based on the model, the phenomena of adhesion, microslip, and the transition between them in AFP are systematically analyzed. For engineering applications, a discrete processing strategy is proposed to quickly obtain the local curvatures of the mold. Additionally, an algorithm is designed to calculate the contact stress of any path. Experimental results on an aircraft component demonstrate the accuracy of the proposed model in restoring the contact stress distribution during AFP. In conjunction with specific layup information, this model exhibits utility in forecasting laying defects and parameter optimization.Highlights An analytical modeling approach based on Hertz theory is proposed to calculate the contact stress in automated fiber placement. A model‐based algorithm is designed and combined with the proposed discrete scheme to quickly restore the contact stress distribution. Contact states related to stress are systematically investigated and defects analysis based on computational mechanics results is illustrated.

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