Subcritical crack growth models for static fatigue of Hi‐Nicalon^TM‐S SiC fiber in air and steam

Three subcritical crack growth (SCG) laws were used to model strain‐rates and failure times for static fatigue of Hi‐Nicalon TM ‐S SiC fiber tows in air and Si(OH) 4 (g)‐saturated steam. Models were fit to tow failure times ( t f ) and steady‐state strain rates ( ἑ ) for brittle creep measured at 700 to 1100°C under initial applied stresses ( σ A ) of 260 to 1260 MPa. A power law, a reaction‐rate law, and a bond‐energy law were used to describe...