A method to analyze shear cell data of powders measured under different initial consolidation stresses

作者：Wang Yifan; Koynov Sara; Glasser Benjamin J; Muzzio Fernando J^*

来源：Powder Technology, 2016, 294: 105-112.

DOI：10.1016/j.powtec.2016.02.027

• Powder flow
• Shear cell
• Mohr circle
• Database

Purpose: The shear cell test has been widely used to characterize flow properties of powders and granular materials. The purpose of this study is to address the gap between the extensive usage of the test and the limited methods available to analyze the data, and to introduce methodologies for comparing results for different initial consolidation stresses, materials, and testing devices.
Method: A library of shear cell data was established. Forty-one powders were included, and each material was tested under four different initial consolidation stresses. For each initial consolidation stress, 3 sampling replicates were performed.
Results: A dimensionless cohesion, C*, was defined as the cohesion divided by the initial consolidation stress. By identifying a correlation between the flow function coefficient (ffc) and C*, the effects of the initial consolidation stress and the testing device were separated. In addition, by identifying a mathematical correlation between the unconfined yield strength and the cohesion, the yield loci from different initial consolidation stresses could be collapsed into a single material characteristic line, enabling one to characterize each material by a single number (the characteristic slope). This approach can be used to economically compare different materials, or different testing devices.
Conclusion: The proposed method augments shear cell data analysis and significantly reduces the complexity of the shear cell data.

• 出版日期2016-6