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Proportional limit stress(PLS) and residual thermal stresses(RTS) of 3D SiC/SiC composite were investigated.PLS was obtained by four different methods from the monotonic stress—strain response curve to get a convincing value.RTS in the SiC matrix was quantified by solving the geometric intersection point of the regression lines of hysteresis loops from the periodical loading—unloading—reloading cycle test curve.Classical ACK model and analytical formulas were used to analytically calculate the PLS and RTS of 3D SiC/SiC composite.Good agreement between the experimental results and the analytical calculation was observed.And relationship between the PLS and the RTS of 3D SiC/SiC was discussed.
Proportional limit stress (PLS) and residual thermal stresses (RTS) of 3D SiC / SiC composite were investigated. PLS was obtained by the four different methods from the monotonic stress-strain response curve to get a convincing value. by solving the geometric intersection point of the regression lines of hysteresis loops from the periodical loading-unloading-reloading cycle test curve. Classical ACK model and analytical formulas were used to analytically calculate the PLS and RTS of 3D SiC / SiC composite. Good agreement between the experimental results and the analytical calculation was observed. And relationship between the PLS and the RTS of 3D SiC / SiC was discussed.