Abstract
This study examined how UV exposure and humidity (accelerated weathering) affect flax/epoxy composites. Three configurations (unidirectional, cross-ply, and quasi-isotropic) were aged for 1200 h. Tensile and impact tests revealed significant property degradation in all configurations. Tensile strength, modulus, and strain all decreased after aging. Young’s modulus dropped by 8–11.5%, stress by 12.2–18%, and strain by 10–18.59%. Impact tests showed a decrease in tolerated impact load (6–10%) but an increase in absorbed energy (7–12%). This suggests more surface damage after aging. These results highlight the substantial influence of environmental factors on the long-term performance of flax/epoxy composites.
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