Fig. 1. Application example of GFRP in water environment
Fig. 2. Fiber reinforced material
Fig. 3. Infusion manufacturing method
Fig. 4. Preparation of water-immersion test (laboratory aging)
Fig. 5. Photo images of gelcoat surface after distilled water aging at various immersion temperatures
Fig. 6. Number of gelcoat surface cracks as a function of aging time at various immersion temperatures
Fig. 7. The number of gelcoat cracks on the surface and the depth of crack after immersion test at various temperatures
Fig. 8. Micro CT scan images of GFRP laminates after water immersion for 30 days
Fig. 9. FTIR results from sample aged for 30 days at various immersion temperatures
Fig. 10. Arrhenius plots, initial crack occurrence time of Gelcoat after immersion test at high temperature (65℃, 75℃, 85℃)
Fig. 11. Life time of the gelcoat as a function of temperature
Table 1. Experimental values of Polyester Gelcoat measured
Table 2. Aging test conditions
Table 3. Shore D type hardness of Gelcoat resin immersed in distilled water at various temperatures for 24 hours
Table 4. First crack (h) in 65℃, 75℃, and 85℃ Ortho type gelcoat specimens
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