Tensile strength and fracture surface characterization of Hi-Nicalon™ SiC fibers

Tensile properties and microstructure characterization of Hi-NicalonTM SiC fibers after loading at high temperature

“…Furthermore, because a linear relationship between the fracture mirror size and the critical flaw size has been observed in our work for as-received fibers and in the literatures (Yougnblood 2001;Thouless et al 1989;Taylor et al 1998), using this linear relationship with the result in Fig. 5(a), a dependence of strength on critical flaw size can be characterized by a law (Evans 1974) …”

“…However, the mirror size is clear and can be measured easily. It has been observed that the fracture mirror size is linearly related to the critical flaw size in our work for as-received fibers and in the literatures (Yougnblood 2001;Thouless et al 1989;Taylor et al 1998). In our work, the ratio of critical flaw size (r c ) to mirror size (r m ) for as-received fibers is 0.38.…”

“…In previous studies (Shimoo et al 1998;Shimoo et al 2002, Sha et al 2005, Pysher et al 1989Yougnblood 2001;Thouless et al 1989;Taylor et al 1998), many researchers observed that the strength of ceramic fibers was associated with the critical flaw. As observed in Fig.…”

“…1 and described in a previous study (Yougnblood 2001). The gauge length for single filament tensile test is 25.4 mm.…”

Effect of heat treatment on the tensile strength and creep resistance of advanced SiC fibers

“…The load was applied at a constant strain rate of 2 · 10 À4 /s and measured by a load-cell of 2.5 N. The individual filaments had a gage length of 25.4 mm and were mounted and aligned on cardboard fixture as illustrated in previous study [10]. The cardboard fixture was cut on both sides prior to test.…”