Abstract
Polymer Laboratories' dynamic mechanical thermal analyzer (DTMA) measures the dynamic Young's or shear modulus and loss factor of viscoelastic materials. The DMTA infers the modulus and loss factor by measuring the response of a small sample to forced vibrations in a small material sample. An optimal sample geometry is selected for a given Young's modulus range by considering effects such as thermal stress, shear deflection in short beams, and system compliance. The goal is to minimize these combined errors in the dynamic Young's modulus and loss factor measurement over the full madulus range. As a result of this analysis recommended DMTA test procedures are presented.
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