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Investigation of statistical distribution of C/C-SiC composite’s mechanical properties

Mittwoch (26.06.2019)
10:10 - 10:30 Uhr

Because of the excellent fracture toughness and oxidation resistance, carbon fiber reinforced silicon carbide (C/C-SiC or C/SiC) exhibits a sound potential in various application areas such as aerospace technology and high-performance braking systems. For the composite’s reliable design, production, examination, quality assurance and verification, however, the statistical distribution of mechanical properties is of crucial interest and has not been investigated in detail yet. In this work, the strength values of C/C-SiC composite, which was developed via Liquid Silicon Infiltration at the Institute of Structures and Design of German Aerospace Center (DLR), were measured under tensile, bending and compression load. The results were analyzed by normal and Weibull distribution statistics and verified by Kolmogorov–Smirnov-test (KS-test) and Anderson–Darling-test (AD-test). Based on the statistical analysis, the 4PB-strength of C/C-SiC composite can be better described by Weibull distribution. In comparison, normal distribution is more suitable for the bending and compression strength. The influence of different numbers of coupons on the mechanical properties has been identified. The fracture surface was analyzed by scanning electron microscope (SEM). The results confirmed that the different statistical distribution of strength values was caused by according various failure mechanisms.

Yuan Shi
Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
Weitere Autoren/Referenten:
  • Yanlei Xiu
    Karlsruher Institut für Technologie (KIT)
  • Prof. Dr. Dietmar Koch
    Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)