Abstract
Elevated temperature exposure has a negative effect on the performance of the matrix resin in Carbon Fiber Reinforced Plastics (CFRP) plates, whereas limited quantitative research focuses on the deteriorations. Therefore, 30 CFRP specimens were designed and tested under elevated temperatures (10, 30, 50, 70, and 90 °C) to explore the degradations in tensile properties. The effect of temperature on the failure mode, stress-strain curve, tensile strength, elastic modulus and elongation of CFRP plates were investigated. The results showed that elevated temperature exposure significantly changed the failure characteristics. When the exposed temperature increased from 10 °C to 90 °C, the failure mode changed from the global factures in the whole CFRP plate to the successive fractures in carbon fibers. Moreover, with temperatures increasing, tensile strength and elongation of CFRP plates decreases gradually while the elastic modulus shows negligible change. Finally, the results of One-Way Analysis of Variance (ANOVA) show that the degradation of the tensile strength of CFRP plates was due to the impact of elevated temperature exposure, rather than the test error.
Highlights
Fiber Reinforced Plastics (FRP) composites are increasingly applied for strengthening and repairing existed structures in varying forms, including FRP plates, FRP cloths, FRP bars et al It is divided into carbon fiber reinforced plastics (CFRP), glass fiber reinforced plastics (GFRP), aramid fiber reinforced plastics (AFRP) and basalt fiber reinforced plastics (BFRP) from the nature of the material
The CFRP plate specimens exposed to 10 ◦ C and 30 ◦ C conditions showed similar failure modes
This work describes an experimental investigation of 30 CFRP plates under elevated temperature exposure subjected to axial tension
Summary
Fiber Reinforced Plastics (FRP) composites are increasingly applied for strengthening and repairing existed structures in varying forms, including FRP plates, FRP cloths, FRP bars et al It is divided into carbon fiber reinforced plastics (CFRP), glass fiber reinforced plastics (GFRP), aramid fiber reinforced plastics (AFRP) and basalt fiber reinforced plastics (BFRP) from the nature of the material. This is because FRP materials have advantages of high strength-to-weight ratio, good resistance to electrochemical corrosion, and convenience for installation [1,2,3,4,5]. Special curing agents and fillers, Materials 2019, 12, 1995; doi:10.3390/ma12121995 www.mdpi.com/journal/materials
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