Accession Number:

ADA248810

Title:

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

Descriptive Note:

Rept. for FY 1988-1989,

Corporate Author:

NAVAL SURFACE WARFARE CENTER SILVER SPRING MD

Personal Author(s):

Report Date:

1991-01-01

Pagination or Media Count:

26.0

Abstract:

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, filler 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.

Subject Categories:

  • Elastomers and Rubber

Distribution Statement:

APPROVED FOR PUBLIC RELEASE