Complex Dynamic Modulus Of Nitinol-Reinforced Composites
Report Number: WL-TR-91-3078 Volume III, p. JAA-1
Author(s): Gilheany, J ., Deigan, R., Baz, A.
Corporate Author(s): The Catholic University of America
Date of Publication: 1991-08
Pages: 1
DoD Task:
Identifier: ADA241313
Abstract:
Shape memory fibers, made of a Nlckel-Tltanium alloy (NITINOL), are embedded into :fiberglass/polyester resin composites in order to control their dynamic characteristics over wide frequency and temperature ranges. The characteristics of the resulting NITINOL-reinforced composites can be tuned and controlled adapt to changes in the loading and operating conditions. Such adaptive characteristics can be utilized in controlling the shape and vibration of composite structures. The dynamic characteristics of this class of NITINOL-reinforced composites are quantified by measuring the complex dynamic modulus. The modulus is determined using the Dynamic Mechanical Thermal Analyzer (DMTA) over a temperature range from O to 100°C and over the frequency range from 0.3 to 30 Hz. The effects of shape memory and initial pre-strain of the NITINOL fibers on the complex modulus are also determined over the same temperature and frequency ranges. The measured characteristics are compared with those of unreinforced :fiberglass/polyester resin composites as well as with those of pure NITINOL. It is observed that the continuously decaying storage modulus of the fiberglass composite with increasing temperature, near the glass transition region, can be compensated for by the increased storage modulus of the activated NITINOL fibers. With proper control of the initial pre-strain and activation temperature of the NITINOL fibers, the characteristics of the composite can be tailored for loading and environmental conditions. FULL PAPER NOT AVAILABLE FOR PUBLICATION
Author(s): Gilheany, J ., Deigan, R., Baz, A.
Corporate Author(s): The Catholic University of America
Date of Publication: 1991-08
Pages: 1
DoD Task:
Identifier: ADA241313
Abstract:
Shape memory fibers, made of a Nlckel-Tltanium alloy (NITINOL), are embedded into :fiberglass/polyester resin composites in order to control their dynamic characteristics over wide frequency and temperature ranges. The characteristics of the resulting NITINOL-reinforced composites can be tuned and controlled adapt to changes in the loading and operating conditions. Such adaptive characteristics can be utilized in controlling the shape and vibration of composite structures. The dynamic characteristics of this class of NITINOL-reinforced composites are quantified by measuring the complex dynamic modulus. The modulus is determined using the Dynamic Mechanical Thermal Analyzer (DMTA) over a temperature range from O to 100°C and over the frequency range from 0.3 to 30 Hz. The effects of shape memory and initial pre-strain of the NITINOL fibers on the complex modulus are also determined over the same temperature and frequency ranges. The measured characteristics are compared with those of unreinforced :fiberglass/polyester resin composites as well as with those of pure NITINOL. It is observed that the continuously decaying storage modulus of the fiberglass composite with increasing temperature, near the glass transition region, can be compensated for by the increased storage modulus of the activated NITINOL fibers. With proper control of the initial pre-strain and activation temperature of the NITINOL fibers, the characteristics of the composite can be tailored for loading and environmental conditions. FULL PAPER NOT AVAILABLE FOR PUBLICATION
Other options for obtaining this report:
Via the Defense Technical Information Center (DTIC): A record for this report, and possibly a pdf download of the report, exists at DTIC Via National Technical Report Library: This report may be available for download from NTRL. Use the Title from this record to locate the item in DTIC Online Indications of Public Availability No digital image of an index entry indicating public availability is currently available There has been no verification of an indication of public availability from an inside cover statementRelated report(s)
This report is part of the following conference:
-
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)
WL-TR-91-3078 Volume III