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<p>Carbon fiber composites are used in the aerospace industry for high-temperature applications due their low density and superior mechanical properties. They can be used as structural material in the airframe structures of aerospace vehicles, which experiences high temperatures below the glass transition temperature of the resin. Evaluating flexural strength and interlaminar shear strength (ILSS) at elevated temperatures is critical for their application in high-temperature environments. In this study, unidirectional (UD) carbon-epoxy composites made with 12K carbon fibers and bidirectional (BD) carbon-epoxy composites fabricated using 3K carbon fabric were tested, both utilizing epoxy resin as the matrix. Flexural and ILSS tests were conducted at 25, 80, 100 and 150&#xa0;°C using three-point bending and short-beam shear setups, respectively. Results revealed that both flexural strength and ILSS decrease linearly with increasing temperature from room temperature (RT) to 150&#xa0;°C, but the drop in flexural strength is 50% in BD composites (645-325&#xa0;MPa) and 34% in UD composite (1104-727&#xa0;MPa). Similarly drop in ILSS is 46% in BD composites (39-21&#xa0;MPa) and 43% in UD composite (71-40&#xa0;MPa) with increase in temperature from RT to 150&#xa0;°C. The drop in flexural modulus was not significant for both composites. A predictive model, originally developed using composite DMA data for the UD composite flexural strength and ILSS, was successfully applied to the BD composite. A new model using neat resin DMA data has been used to predict the high-temperature flexural strength and ILSS of UD and BD composites.</p>

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Flexural and Interlaminar Shear Strength Properties of Unidirectional and Bidirectional Carbon-Epoxy Composites at Elevated Temperatures

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Anu Anna Abraham,
  • A. V. L. N. Raghu Ram,
  • Ramesh Adusumalli,
  • Pavan Kumar Penumakala

摘要

Carbon fiber composites are used in the aerospace industry for high-temperature applications due their low density and superior mechanical properties. They can be used as structural material in the airframe structures of aerospace vehicles, which experiences high temperatures below the glass transition temperature of the resin. Evaluating flexural strength and interlaminar shear strength (ILSS) at elevated temperatures is critical for their application in high-temperature environments. In this study, unidirectional (UD) carbon-epoxy composites made with 12K carbon fibers and bidirectional (BD) carbon-epoxy composites fabricated using 3K carbon fabric were tested, both utilizing epoxy resin as the matrix. Flexural and ILSS tests were conducted at 25, 80, 100 and 150 °C using three-point bending and short-beam shear setups, respectively. Results revealed that both flexural strength and ILSS decrease linearly with increasing temperature from room temperature (RT) to 150 °C, but the drop in flexural strength is 50% in BD composites (645-325 MPa) and 34% in UD composite (1104-727 MPa). Similarly drop in ILSS is 46% in BD composites (39-21 MPa) and 43% in UD composite (71-40 MPa) with increase in temperature from RT to 150 °C. The drop in flexural modulus was not significant for both composites. A predictive model, originally developed using composite DMA data for the UD composite flexural strength and ILSS, was successfully applied to the BD composite. A new model using neat resin DMA data has been used to predict the high-temperature flexural strength and ILSS of UD and BD composites.