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Cure Monitoring of Carbon Fiber Reinforced Composite via Laser Vibrometry

LIUDMYLA PROZOROVSKA, RAYMOND BOND and DOUGLAS ADAMS

Abstract


Effective in-line cure monitoring is crucial for quality and cost optimization of carbon fiber reinforced (CFR) composites manufacturing. The capability to ensure high quality and low cost production of CFR composites through improved monitoring methods will make the material more accessible to various industries. In the present study, 3D scanning laser Doppler vibrometry (LDV) is used as a means of remote, non-invasive monitoring of the degree of cure in unidirectional CFR epoxy prepreg tape. Analysis of the surface velocity of the test samples shows the changes in vibration characteristics that relate to the viscoelastic properties of the material. These properties are directly affected by phase transitions that occur as the sample cures. Differential scanning calorimetry (DSC) is used to develop a baseline model against which the laser vibrometry data are analyzed. The presented findings will be leveraged in further development of real-time cure monitoring technologies.

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