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Investigation of Carbon-Polymer Structures with Embedded Fiber-Optic Bragg GratingsSeveral Bragg-grating sensors fabricated within the same optical fiber are buried within multiple-ply carbon-epoxy planar and cylindrical structures. Effect of different orientation of fiber-sensors with respect to carbon fibers in the composite structure is investigated. This is done for both fabric and uni-tape material samples. Response of planar structures to axial and transverse strain up to 1 millistrain is investigated with distributed Bragg-grating sensors. Material properties like Young's Modulus and Poisson ratio is measured. A comparison is made between response measured by sensors in different ply-layers and those bonded on the surface. The results from buried fiber- sensors do not completely agree with surface bonded conventional strain gauges. A plausible explanation is given for observed differences. The planar structures are subjected to impacts with energies up to 10 ft-lb. Effect of this impact on the material stiffness is also investigated with buried fiber-optic Bragg sensors. The strain response of such optical sensors is also measured for cylindrical carbon-epoxy composite structures. The sensors are buried within the walls of the cylinder as well as surface bonded in both the axial as well as hoop directions. The response of these fiber-optic sensors is investigated by pressurizing the cylinder up to its burst pressure of around 1500 psi. This is done at both room temperature as well as cryogenic temperatures. The recorded response is compared with that from a conventional strain gauge.
Document ID
20030061364
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Grant, Joseph
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Kaul, R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Taylor, S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Myers, G.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Sharma, A.
(Alabama Agricultural and Mechanical Univ. Normal, AL, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Composite Materials
Meeting Information
Meeting: NASA MSFC 2003 Propulsion Measurement Sensor Development Workshop
Location: Huntsville, AL
Country: United States
Start Date: May 13, 2003
End Date: May 15, 2003
Distribution Limits
Public
Copyright
Other

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