Dynamic Mechanical Materials Characterization and Analysis Using a Dynamic Mechanical Thermal Analyzer.

摘要

Material characterization is essential both for design use and control. Specifically, materials designed for vibration damping and noise suppression precise values of the modulus and loss factor over a wide range of frequency and temperature. Until now, apparatus for making such measurements had very limited frequency and temperature ranges, were of questionable accuracy, and were usually very time consuming to operate. This report presents data as a function of temperature, from the glassy to the rubbery region, measured on a Polymer Laboratories' Dynamic Mechanical Thermal Analyzer (DMTA) and the same data transformed into the frequency domain using the Williams-Landel-Ferry (WLF) time temperature shift equation. Data were collected on a number of natural, neoprene, nitrile, and polyurethane materials with different levels of reinforcement filler. The data clearly show the effect of polymer selection, riller type, and loading on the dynamic properties. Finally, the complex moduli may be analyzed in terms of the fractional operator model which describes both the storage and loss moduli with a single complex equation. The results suggest an analytic method for optimizing the dynamic response through detailed material selection.