Smart materials in BTeV?Antonio PaolozziUniversity of Rome La SapienzaINFN Laboratori Nazionali Frascati

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 applicationsPOSSIBLE APPLICATIONSSUPPORT STRUCTURES OF MICROSTRIPSUPPORT OF OTHER DETECTORS

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 COMPONENTSWHY CFRP WITH EMBEDDED SENSORS?

MANUFACTURING PHASES

DIFFERENT SPECIMENS TO TEST SEVERAL EMBEDDING PROCEDURES

AVOID FIBER DAMAGE

OBTAIN OPTIMAL BONDING BETWEEN OPTICAL FIBER AND COMPOSITE STRUCTURE

Acrylate coated optical fiberUncoated optical fiberMicrographic analysis of embedded optical fiber

Micrographic analysis of optical fiberembedded with epoxy resin filmAcrylate coated optical fiberUncoated optical fiber

Experimental testStructural bonding between CFRP structure and FBG sensorFBG resolution (axial deformation) evaluation

Enforced displacement at steps of 100mmLinearity: excellent FBG-CFRP structural bondingResolution of axial deformation by FBG: better than 0.5mm

PLANNED TEST METALLIC BRACES HOLDING SUB-DETECTORS REPLACED BY CFRP SMART BRACES

CONCLUSIONSPERFECT BONDING BETWEEN FBGs AND CFRP WITH NO REDUCTION OF CFRP MECHANICAL CHARACTERISTICS