Evaluation of Anisotropic Viscoelasticity by Indentation Test

Abstract

This study develops the indentation method to evaluate transversely isotropic viscoelasticity. Firstly, it is shown that rigid cone indentation for transversely isotropic elastic materials and transversely isotropic viscoelastic materials have the same coefficient that is function of ratio of Young's modulus. Next, the indentation force and the penetration depth curve, F - h curve, on transversely isotropic elastic material are analyzed by finite element method. As the results, the coefficient of loading part of the F - h curve can be expressed as a function of ratio of Young's modulus. Finally, this indentation method is applied to measure anisotropic viscoelasticity of plastically deformed polycarbonate.