Transition between solid and liquid state of yield-stress fluids under purely extensional deformations
Transition between solid and liquid state of yield-stress fluids under purely extensional deformations
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纯拉伸变形下屈服应力流体的固态和液态之间的转变
DOI:
10.1073/pnas.1922242117
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Tsamopoulos John
中科院分区:
文献类型:
--
作者:
Varchanis Stylianos;Haward Simon J.;Hopkins Cameron C.;Syrakos Alexandros;Shen Amy Q.;Dimakopoulos Yannis;Tsamopoulos John
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.
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通讯作者:
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DOI:
--
发表时间:
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期刊:
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