smart materials in btev?
DESCRIPTION
Smart materials in BTeV?. Antonio Paolozzi University of Rome ‘La Sapienza’ INFN Laboratori Nazionali Frascati. OBJECTIVE Testing embedding Fiber Bragg Gratings (FBGs) into a Carbon Fiber Reinforced Plastic Composite (CFRP) - PowerPoint PPT PresentationTRANSCRIPT
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Smart materials in BTeV?
Antonio Paolozzi
University of Rome ‘La Sapienza’
INFN Laboratori Nazionali Frascati
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OBJECTIVE
Testing embedding Fiber Bragg Gratings (FBGs) into a Carbon Fiber Reinforced Plastic Composite (CFRP)
Manufacturing a smart material that could be used in some BTeV applications
POSSIBLE APPLICATIONS
• SUPPORT STRUCTURES OF MICROSTRIP
• SUPPORT OF OTHER DETECTORS
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• LOW ATOMIC NUMBER AND HIGH MECHANICAL CHARACTERISTCS
• HIGH THERMAL STABILITY (VERY LOW THERMAL EXPANSION COEFFICIENT
• POSSIBILITY TO POSITION THE SENSORS IN ANY STRUCTURALLY SIGNIFICANT POINT IN THE STRUCTURE
• HIGHER RELIABILITY IN HANDLING SENSORIZED COMPONENTS
WHY CFRP WITH EMBEDDED SENSORS?
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MANUFACTURING PHASES
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DIFFERENT SPECIMENS TO TEST SEVERAL EMBEDDING PROCEDURES
•AVOID FIBER DAMAGE
•OBTAIN OPTIMAL BONDING BETWEEN OPTICAL FIBER
AND COMPOSITE STRUCTURE
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Acrylate coated optical fiber Uncoated optical fiber
Micrographic analysis of embedded optical fiber
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Micrographic analysis of optical fiber
embedded with epoxy resin film
Acrylate coated optical fiber Uncoated optical fiber
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Experimental test
• Structural bonding between CFRP structure and FBG sensor
• FBG resolution (axial deformation) evaluation
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3000 2000 1000 0 1000 2000 30000.2
0.1
0
0.1
0.2
Tip Displacement (micron)
Wav
elen
gth
Shi
f (n
m)
0.01 0.005 0 0.005 0.010.2
0.1
0
0.1
0.2
Axial deformation (micron)
Wav
elen
gth
Shi
f (n
m)
Enforced displacement at steps of 100m
Linearity: excellent FBG-CFRP structural bonding
Resolution of axial deformation by FBG: better than 0.5m
100 0 100 200 300 4000.01
0
0.01
0.02
0.03
Tip Displacement (micron)
Wav
elen
gth
Shif
(nm
)
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PLANNED TEST
METALLIC BRACES HOLDING SUB-DETECTORS REPLACED BY CFRP SMART BRACES
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CONCLUSIONS
•PERFECT BONDING BETWEEN FBGs AND CFRP WITH NO REDUCTION OF CFRP MECHANICAL CHARACTERISTICS