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Nanoindentation of Viscoelastic Materials: Mechanical Properties of Polymer Coatings on Aluminum Substrates

  • K. B. Yoder (a1), S. Ahuja (a2), K. T. Dihn (a2), D. A. Crowson (a3), S. G. Corcoran (a3), L. Cheng (a1) and W. W. Gerberich (a1)...

Abstract

The mechanical properties of four polymer coatings on aluminum foil substrates are examined using nanoindentation with a Hysitron Triboscope, an add-on to an AFM. In addition to static hardness and modulus measurements, the viscoelastic properties of the films, which differ in Tg and extent of crosslinking, are investigated by employing two techniques: using nanoindentation parameters to fit the creep response of the material to a one-dimensional equation based on a three-element Zener model of the viscoelastic behavior of the polymer; and fitting the creep response of the material to a previously developed, three-dimensional model of the response of a viscoelastic material to indentation by a spherical indenter. It is found that the measured static moduli are about 1.5 times greater than results of fitting creep data to the 1-D model, and are a factor of 3–6 times greater than those obtained by fits of the 3-D model.

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Nanoindentation of Viscoelastic Materials: Mechanical Properties of Polymer Coatings on Aluminum Substrates

  • K. B. Yoder (a1), S. Ahuja (a2), K. T. Dihn (a2), D. A. Crowson (a3), S. G. Corcoran (a3), L. Cheng (a1) and W. W. Gerberich (a1)...

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