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

Quasi-Static Loading Test on Di-AC embedded 3-Ply GFRP

– 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 0.9mm (T)
– Field of View: 7mm x 7mm
– Notch of length ≈1mm at the left edge of the specimen

• Intensity of fluorescence starts increasing around 0.7% strain
• Noticeable stripes with high intensity are observed after 1.5% strain
• Significant rise occurs around 2.3% strain before yield strain (2.45%) ⇒ Early damage detection