EXPERIMENTATION FOR FLEXURAL STRENGTH AND FRACTURE TOUGHNESS ON CARBON AND GLASS FIBER SELF-HEALING COMPOSITES WITH BISPHENOL A DIGLYCIDYL ETHER AND AMINE MICROCAPSULES

摘要

The present study investigates self-healing ability of carbon/E-glass fibers composites based on microcapsule approach under flexural and fracture loading. The proposed self-healing fiber reinforced composite constitutes epoxy resin (Lapox ARL-136+AH-126), unidirectional carbon, and E-glass fibers with different orientations such as 0 degrees, 45 degrees, and 90 degrees, microcapsules of BADGE (monomer) and amine with AH-319 hardener as curing agent are embedded. The self-healing ability of the developed composites at different healing time (5, 6, and 7 days) and comparison of recovered flexural strength for carbon/E-glass fiber along different orientations are studied. On day 7 the healing efficiencies obtained are 61.89, 61.20, 78.30 and 64.50, 68.55, 82.77 for carbon/E-glass fiber orientation along 0 degrees, 45 degrees, 90 degrees composite, respectively. By knowing the drawbacks of microcapsule-based system and to reduce the healing time, experimentally fracture properties in mode I, II, mixed-mode conditions, and efficiencies based on extrinsic approach are evaluated. Optimum healing efficiencies obtained in mode I for carbon/E-glass fiber orientation along 45 degrees are 103.51 and 84.16, respectively. Similarly in mode II for carbon fiber along 0 degrees and E-glass fiber along 45 degrees, obtained efficiencies are 130.32 and 84.48, respectively. And, in mixed mode for carbon fiber along 90 degrees and E-glass fiber along 45 degrees obtained efficiencies are 232.78 and 119.23, respectively. Optimum fracture toughness of healed is 75 as compared to virgin samples. The results show that the self-healing composites may provide excellent mechanical and fracture properties towards a wide range of structural applications.