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Proportionality between powder cohesion and unconfined yield strength from shear cell testing
David J Sun1, Changquan Calvin Sun2
1Nova Classical Academy, St. Paul, MN 55102, USA.
Heliyon
|February 7, 2019
Summary
Powder cohesion is directly proportional to unconfined yield strength (f_c). This relationship simplifies powder flow characterization, as only one parameter is needed.
Area of Science:
- Materials Science
- Chemical Engineering
- Powder Technology
Background:
- Shear cell testing is crucial for evaluating powder flow properties.
- Understanding powder cohesion and yield strength is essential for material handling and processing.
Purpose of the Study:
- To analyze the geometric relationship between the yield locus and Mohr's circle for determining unconfined yield strength (f_c).
- To establish a simplified method for characterizing powder flow properties.
Main Methods:
- Geometric analysis of yield locus and Mohr's circle in shear cell testing.
- Calculation of unconfined yield strength (f_c) and powder cohesion.
Main Results:
- Powder cohesion is shown to be directly proportional to unconfined yield strength (f_c).
- The proportionality constant is dependent on the angle of the linearized yield locus, specifically (1-sinθ)/(2cosθ).
Conclusions:
- A single parameter, either f_c or the proportionality constant, is sufficient to characterize the flow properties of a new powder.
- This finding simplifies the analysis of powder rheology and aids in process design.
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