Browsing by Author "Narain, D"

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    Progressive fracture testing of carbon–carbon composites
    (Elsevier, 2022-10-22) Reiner, J; Narain, D; Zhang, P; Flores-Johnson, EA; Muránsky, O
    Carbon–Carbon (C/C) composites can retain their mechanical properties at extreme temperatures of up to 3000 °C. This study quantifies damage resistance in cross-ply C/C composites by means of compact tension tests at room temperature adapted from typical tests on carbon fibre reinforced polymers. The analysis of different specimen sizes reveals that baseline (dimensions: 70 mm × 90 mm) and large scaled-up samples yield consistent fracture energy values of 15–30 kJ/m2 while the scaled-down version shows unwanted failure around the loading pins. A microscopic cross-sectional analysis explains the relatively low fracture energy values of carbon/carbon composites compared to carbon fibre reinforced polymers. It is found that only 20%–40% of the carbon fibres in loading direction fail in C/C composites which leads to reduced energy absorption during the progressive fracture test.