Tensile and fatigue behavior of oxide/oxide ceramic matrix composite with simulated foreign object damage in combustion environment

Abstract

In this study, oxide/oxide ceramic matrix composite test coupons were quasi‐statically indented and tested for tensile strength and fatigue life in a combustion environment. The combustion environment simulated the gas turbine engine environment in an aircraft. Two different dent sizes were created on two different sets of test coupons with a blunt conical indentor. During mechanical testing, the combustion flame simultaneously impinged on the dent region resulting in a maximum test coupon surface temperature of 1250 ± 50°C. For a life of 90 000 cycles, the fatigue limit in the combustion environment was 85% of the postindentation degraded tensile strength. Microscopy images of the failed test coupons showed damage modes of fiber fracture and matrix cracking at the dent site. The run‐out test coupons which did not fail within 90 000 cycles showed residual strength that was not significantly different from that of their virgin counterparts.

Perspective: Challenges in the Aerospace Marketplace and Growth Opportunities for Thermal Spray

“…These ceramic composite systems are lightweight combinations of alumina and/or mullite fibers embedded in an alumina matrix (Ref 35 , 36 ). They are potential high-temperature alternative solutions to superalloys and silicon-based ceramic matrix composites.…”

Effects of moisture ingression on the impact damage resistance and damage tolerance of alumina based oxide/oxide ceramic matrix composites

“…Ceramic matrix composites due to their quasi-ductile behavior provide greater resilience to impact damage in comparison to brittle monolithic ceramics. While a number of studies have previously focused on impact damage in CMCs under different environments, [17][18][19][20][21][22][23][24][25] only a single study looked at the effect of moisture ingression on the impact damage resistance of CMC. 17 The study focused on alumina based CMC with [0°/90°] 3s layup and did not extend to the post-impact compressive strength (damage tolerance) of the laminates.…”