DTIC ADA640492: Dynamic Measurements of Three Urethane pdf

DTIC ADA640492: Dynamic Measurements of Three Urethane

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This technical document reports the test results of dynamic tests performed using a Metravib Visco-analyseur Machine on three urethane hose materials (Dow 2103-80A3 Pellethane, Dow 2351-85AE Pellethane, and B. F. Goodrich 58315 Estane). The materials were supplied by the Johns Hopkins University Applied Physics Laboratory. Dynamic measurements were made over a temperature range of -40 to +40 deg C and a frequency range of 5 to 500 Hz. Mechanically-measured transitions were observed and were all approximately 0 deg C. In an attempt to collect directly-measured data to 1000 Hz, the measured test data above 500 Hz was observed to contain data scatter which was deemed questionable and, thus, considered unreliable. The maximum frequency of the data determined reliable was limited to 500 Hz. To extrapolate data beyond the directly- measurable frequency range, a Williams, Landel and Ferry (WLF) frequency/temperature shift was performed. The shifted data extends well beyond the desired frequency of 1000 Hz.

An additional test was performed on a Differential Scanning Calorimeter to determine the glass transition temperature (Tg). The Tg was determined for the materials as approximately 30 to 40 deg C below the mechanically-measured transitions

• Creator/s: Defense Technical Information Center
• Date: 5/3/1995
• Year: 1995
• Book Topics/Themes: DTIC Archive, , NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI, *HOSES, *URETHANES, CALORIMETERS, DYNAMIC TESTS, EXTRAPOLATION, FREQUENCY SHIFT, GLASS TRANSITION TEMPERATURE, LOW TEMPERATURE, MECHANICAL PROPERTIES

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