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research-article

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
mjp80@zips.uakron.edu

Nesredin Kedir

Naval Air Systems Command, Patuxent River, MD, USA
nesredinfkedir@gmail.com

Luis Sanchez

Naval Air Systems Command, Patuxent River, MD, USA
luis.j.sanchez@navy.mil

Calvin Faucett

Naval Air Systems Command, Patuxent River, MD, USA
david.faucett@navy.mil

Sung R Choi

Naval Air Systems Command, Patuxent River, MD, USA
sung.choi1@navy.mil

Gregory Morscher

The University of Akron, Akron, OH, USA
gm33@uakron.edu

1Corresponding author.

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

Abstract

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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