Complex Dynamic Modulus Of Nitinol-Reinforced Composites

Item

Title
Complex Dynamic Modulus Of Nitinol-Reinforced Composites
Report Number
WL-TR-91-3078 Volume III, p. JAA-1
Creator
Gilheany, J .
Deigan, R.
Baz, A.
Corporate Author
The Catholic University of America
Date
1991
Date Issued
1991-08
Extent
1
Identifier
ADA241313
Format
1 online resource
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
Description
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
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Photo Quality
Not Needed
Report Availability
Full text available
Is Part Of
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)
Media
articleJAA

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Items with "Has Part: Complex Dynamic Modulus Of Nitinol-Reinforced Composites"
Title Class
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)