Presentazione di PowerPoint

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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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WHY CFRP WITH EMBEDDED SENSORS?

• 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

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MANUFACTURING PHASES
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(No Transcript)
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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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Micrographic analysis of embedded optical fiber
Acrylate coated optical fiber
Uncoated 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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Enforced displacement at steps of
100mm Linearity excellent FBG-CFRP structural
bonding Resolution of axial deformation by FBG
better than 0.5mm
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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