Fracture Toughness of Moldable Low-Temperature Carbonized Elastomer-Based Composites Filled with Shungite and Short Carbon Fibers

Semen D. Ignatyev, Eugene S. Statnik, Dmitriy Yu Ozherelkov, Dmitry D. Zherebtsov, Alexey I. Salimon, Dilyus I. Chukov, Victor V. Tcherdyntsev, Andrey A. Stepashkin, Alexander M. Korsunsky

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This work evaluated the fracture toughness of the low-temperature carbonized elastomer-based composites filled with shungite and short carbon fibers. The effects of the carbonization temperature and filler content on the critical stress intensity factor (K1c) were examined. The K1c parameter was obtained using three-point bending tests for specimens with different l/b ratio (notch depth to sample thickness) ranging from 0.2 to 0.4. Reliable detection of the initiation and propagation of cracks was achieved using an acoustic sensor was attached to the samples during the bending test. The critical stress intensity factor was found to decrease linearly with increasing carbonization temperature. As the temperature increased from 280 to 380C, the K1c parameter was drastically reduced from about 5 to 1 MPa·m1/2 and was associated with intense outgassing during the carbonization step that resulted in sample porosity. The carbon fiber addition led to some incremental toughening; however, it reduced the statistical dispersion of the K1c values.

    Original languageEnglish
    Article number1793
    JournalPolymers
    Volume14
    Issue number9
    DOIs
    Publication statusPublished - 1 May 2022

    Keywords

    • acoustics
    • carbonization
    • composites
    • fracture toughness
    • microstructure
    • rubbers
    • short carbon fibers
    • shungite
    • stress intensity factor
    • three-point bending test

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