Transition between solid and liquid state of yield-stress fluids under purely extensional deformations

• Stylianos, Varchanis

• Simon J., Haward

• Cameron C., Hopkins

• Alexandros, Syrakos

• Amy Q., Shen

• Yannis, Dimakopoulos

• John, Tsamopoulos

抄録

We report experimental microfluidic measurements and theoretical modeling of elastoviscoplastic materials under steady, planar elongation. Employing a theory that allows the solid state to deform, we predict the yielding and flow dynamics of such complex materials in pure extensional flows. We find a significant deviation of the ratio of the elongational to the shear yield stress from the standard value predicted by ideal viscoplastic theory, which is attributed to the normal stresses that develop in the solid state prior to yielding. Our results show that the yield strain of the material governs the transition dynamics from the solid state to the liquid state. Finally, given the difficulties of quantifying the stress field in such materials under elongational flow conditions, we identify a simple scaling law that enables the determination of the elongational yield stress from experimentally measured velocity fields.

source:https://creativecommons.org/licenses/by-nc-nd/4.0/

source:https://www.pnas.org/content/117/23/12611

収録刊行物

• Proceedings of the National Academy of Sciences

  Proceedings of the National Academy of Sciences 117 (23), 12611-12617, 2020-05-20

  PNAS

キーワード

• Multidisciplinary

詳細情報

• CRID: 1050285299914969984
• NII論文ID: 120006876548
• ISSN: 00278424
• ISSN: 10916490
• DOI: 10.1073/pnas.1922242117
• Web Site: http://id.nii.ac.jp/1394/00001453/
• Web Site: https://pnas.org/doi/pdf/10.1073/pnas.1922242117
• 本文言語コード: en
• 資料種別: journal article
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