先進CFRP複合材料の環境強度特性

抄録

A long carbon fiber with 5.5GPa in average tensile stress-reinforced epoxy plastic (CFRP) has been studied to determine the environmental effect on the tensile stress and fracture behavior of the advanced CFRP. The cross-ply laminates (0°/90°plies) were used in this study. Unnotched and notched tensile tests were conducted using Instron machine from ambient temperature to 130°C. The tensile specimens were immersed in distilled water, 40wt.% nitric acid and 40wt.% sulfuric acid at ambient temperature for a month (designated as distilled-water, nitric-acid and sulfuric-acid specimens, respectively). The results were compared with those obtained by the non-immersed specimens. The tensile fracture stresses of unnotched and notched specimens increased in the following ascending order: non-immersion, distilled-water, nitric acid and sulfuric acid. However, there was little difference in the tensile stress between immersed and non-immersed specimens at 130°C for unnotched specimens and at and above 80°C for the notched specimens. The results are described and discussed in terms of fractography, EPMA and FT-IR analysis and so on.