Poroelastic Relaxation Indentation of Thin Layers of Gels
PRINCETON UNIV NJ OFFICE OF RESEARCH AND PROJECT ADMINISTRATION
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We develop a method of poroelastic relaxation indentation PRI to characterize thin layers of gels. The solution to the time-dependent boundary-value problem is obtained in a remarkably simple form, so that the force-relaxation curve obtained by indenting a gel readily determines all the poroelastic constants of the gel-the shear modulus, Poissons ratio, and the effective diffusivity. The method is demonstrated with a layer of polydimethylsiloxane immersed in heptane.
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