Life-limiting behavior of an oxide/oxide ceramic matrix composite at elevated temperature subject to foreign object damage

[+] Author and Article Information
Michael Presby

Naval Air Systems Command, Patuxent River, MD, USA

Nesredin Kedir

Naval Air Systems Command, Patuxent River, MD, USA

Luis Sanchez

Naval Air Systems Command, Patuxent River, MD, USA

Calvin Faucett

Naval Air Systems Command, Patuxent River, MD, USA

Sung R Choi

Naval Air Systems Command, Patuxent River, MD, USA

Gregory Morscher

The University of Akron, Akron, OH, USA

1Corresponding author.

ASME doi:10.1115/1.4041145 History: Received July 13, 2018; Revised July 23, 2018


The life-limiting behavior of an N720/alumina oxide/oxide ceramic matrix composite (CMC) was assessed in tension in air at 1200°C for unimpacted and impacted specimens. CMC targets were subjected to ballistic impact at ambient temperature with an impact velocity of 250 m/s under a full support configuration. Subsequent post-impact ultimate tensile strength was determined as a function of test rate in order to determine the susceptibility to delayed failure, or slow crack growth (SCG). Unimpacted and impacted specimens exhibited a significant dependency of ultimate tensile strength on test rate such that the ultimate tensile strength decreased with decreasing test rate. Damage was characterized using x-ray computed tomography (CT), and scanning electron microscopy (SEM). A phenomenological life prediction model was developed in order to predict life from one loading condition (constant stress-rate loading) to another (constant stress loading). The model was verified in part via a theoretical preloading analysis.

Section 4: U.S. Gov Employees + Reg Authors
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