280 S. Mall,J.L Ryba / Composites Science and Technology 68(2008)274-282 T 400C 21.02(ay A30C19S(1 950c1:3-(c Steam Conditions E,0 0c1510h(e Fig. 10. Fracture surface from stress rupture tests at higher magnification(8000x) :(a)400C steam, (b)750C steam, (c)950C steam, (d)400C air, (e) 750°Cair,()950°C Steam Conditions (01 Ambient Air condition Fig.Il. Residual strength fracture surfaces.(a)40° C steam,(b)70° C stean,(c)950° C stean,(d)400°cair,(e)750° air and()950°CFig. 10. Fracture surface from stress rupture tests at higher magnification (8000·): (a) 400 C steam, (b) 750 C steam, (c) 950 C steam, (d) 400 C air, (e) 750 C air, (f) 950 C air. Fig. 11. Residual strength fracture surfaces. (a) 400 C steam, (b) 750 C steam, (c) 950 C steam, (d) 400 C air, (e) 750 C air and (f) 950 C air. 280 S. Mall, J.L. Ryba / Composites Science and Technology 68 (2008) 274–282