Journal of the American Ceramic Society-Rebillat et al. Vol 81. No 9 28 药兰 EE32E兰89月8a 导88房8导月 edw sans a三 ≌月9巴Table V. Evolution of the Interface Characteristics during Push-Back Tests Performed on SiC/SiC Composites Reinforced with Treated Fibers† Number of push-back tests Debonding stress (MPa) Maximum stress (MPa) Imposed displacement (mm) Stress drop with extraction (MPa) Shear stress from plateau (MPa) Shear stress from fitting (MPa) Friction coefficient, m Axial stress (MPa) Clamping stress (MPa) Debonded length (mm) Amplitude of roughness (nm) Wavelength of roughness (nm) Ratio of debonding/drop stresses Sample J, n 4 1, thickness of 150 mm (from Hsueh16) 0 (push-out) 3630 4345 0.8 935 80 4.2 (590) (1570) (0.3) (240) (30) (1.5) 1 970 2040 0.6 490 40 35 0.034 −850 −1030 114 60 490 2.5 (350) (650) (0.3) (220) (8) (20) (0.02) (390) (50) (35) (30) (110) (1.8) Sample B, n 4 2, thickness of 115 mm 0 (push-out) 2675 5000 2.1 1240 120 2.2 (350) (800) (0.4) (215) (20) (0.4) 1 1160 3200 0.3 1360 60 160 0.143 −780 −1150 44 62 370 0.9 (100) (300) (0.1) (130) (6) (50) (0.04) (450) (220) (5) (12) (60) (0.1) †The value in parentheses beneath each measurement is the standard deviation. Fig. 13. Evolution of the interfacial shear stress with n(C–SiC) in the interphase, from push-back tests on composites reinforced with treated fibers. 2324 Journal of the American Ceramic Society—Rebillat et al. Vol. 81, No. 9