December 1997 Control of Interfacial Properties through Fiber Coatings: Monazite Coatings 2989 TTTT AlO fiber system YAG fiber syste Coating Thickness, t(um) 60 40 YAG fiber system LL ⊥, Coating Thickness, t(um) Fig 1. Calculated residual stress distribution as a function of coating thickness for the(---)Al,O, and (---)YAG fiber systems(a)axial stress in the fiber and(b)radial stress acting across the fiber/coating interface Al O, Fiber/ Lapo Coating/Al O, Matrix Average Coating Thickness: 6.5 um Embedded Fiber Length: 0.6 mm Crosshead Displacement (um 50 P YAG Fiber/IaPO, Coaling /Al O, Matrix verage Coating Thickness: 2 pm Embedded Fiber Length: 0.7 m Crosshead Displacement (um Fig. 2. Typical pushout curves for(a)the AlO, fiber system and (b)the YAG fiber system.Fig. 1. Calculated residual stress distribution as a function of coating thickness for the (– – –) Al2O3 and (– - –) YAG fiber systems ((a) axial stress in the fiber and (b) radial stress acting across the fiber/coating interface). Fig. 2. Typical pushout curves for (a) the Al2O3 fiber system and (b) the YAG fiber system. December 1997 Control of Interfacial Properties through Fiber Coatings: Monazite Coatings 2989