Dataset on fractographic analysis of various SiC-based fibers

Stress rupture of SiC/SiC composite tubes under high‐temperature steam

“…The critical flaw size of as-fabricated HNS fiber (a 0 ) is 33 nm. 28 By assuming that the fracture toughness of the fibers remains constant and that the characteristic fiber strength, 𝜎 0 , is related to the mean oxide layer thickness, when a = α, then the time dependence of the fiber characteristic strength will be given by…”

“…According to linear elastic fracture mechanics, strength and critical flaw size are related through the fracture toughness as follows: 13 $$$$\begin{equation}{K}_{{\rm{IC}}} = \ Y{\sigma }_0\sqrt a ,\end{equation}$$$$where K IC is the fracture toughness, Y is a geometric parameter, σ 0 is the strength, and a is the critical flaw size. The critical flaw size of as‐fabricated HNS fiber ( a 0 ) is 33 nm 28 . By assuming that the fracture toughness of the fibers remains constant and that the characteristic fiber strength, $$\overline {{\sigma }_0} $$, is related to the mean oxide layer thickness, when a = α, then the time dependence of the fiber characteristic strength will be given by $$$$\begin{equation}\overline {{{{\sigma}}}_0} \ \left( t \right) = \overline {{{{\sigma}}}_0} \ \ ({{\alpha}} < {a}_0)\end{equation}$$$$ $$$$\begin{equation}\overline {{{{\sigma}}}_0} \ \left( t \right) = \overline {{{{\sigma}}}_0} \ \ {\left( {\frac{{{a}_0}}{{{\alpha}}}} \right)}^{0.5}\left( {{{\alpha}} \ge {a}_0} \right).\end{equation}$$$$…”

Oxidation under stress of SiC‐based fibers at intermediate temperature and ambient air

“…Therefore, to ensure a reasonable number of filaments would fail by SCG during the preliminary static fatigue test, endurance diagrams showing the expected spread of filament time to failure were built (Figures 2 and S2). Therefore, Monte-Carlo simulations presented in 82 were performed using a random fiber strength (extracted from the Weibull statistical distribution Table S1 45,69,83 ) in the life prediction model (Equation ( 9)). 72,79 This approach reveals the first tests above presented were safe in terms of probability of failure by SCG (Figure S2b available online).…”