Experimental Demonstration of In-Situ Damage Detection in Fiber Reinforced Composites

Quasi-Static Loading Test on Di-AC embedded CFRP

– Strain rate: 0.0032 mm/sec
– Epoxy Resin: Hardener (100:27)
– 5 wt% Dimeric Anthracene (Di-AC, mechanophore)
– Dimension: 55mm(L) x 20mm(W) x 0.3mm (T)
– Field of View: 7mm x 7mm
– Notch of length ≈1mm at the left edge of the specimen

• Intensity of fluorescence increases as strain increases
• Near-linear increase in intensity is observed
• Significant rise occurs at 0.3%, 0.5%, 1% and 1.2% strain before yield strain (1.3%) ⇒ Early damage detection