Research Papers

Foreign Object Damage Behavior of a Silicon Carbide Fibrous Ceramic Composite

[+] Author and Article Information
Nesredin Kedir

Naval Air Systems Command,
Patuxent River, MD 20670
e-mail: nkedir@purdue.edu

D. Calvin Faucett, Luis Sanchez, Sung R. Choi

Naval Air Systems Command,
Patuxent River, MD 20670

1Corresponding author.

2Present address: Materials Engineering, Purdue University, West Lafayette, IN 47907.

Manuscript received August 30, 2018; final manuscript received September 16, 2018; published online November 1, 2018. Editor: Jerzy T. Sawicki. This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.

J. Eng. Gas Turbines Power 141(4), 041004 (Nov 01, 2018) (7 pages) Paper No: GTP-18-1589; doi: 10.1115/1.4041657 History: Received August 30, 2018; Revised September 16, 2018

The response of a silicon carbide (SiC) fibrous ceramic composite to foreign object damage (FOD) was determined at ambient temperature and velocities ranging from 40 to 150 m/s. Target specimens were impacted, at a normal incidence angle and in a partially supported configuration, using 1.59 mm diameter hardened steel ball projectiles. Qualitative analysis of the damage morphologies of targets and projectiles was made via scanning electron microscopy (SEM). In addition, the extent of impact damage was characterized by determining the post-impact strength of each target specimen as a function of impact velocity. Relative to the as-received (As-R) strength, the fibrous composite showed limited strength degradation due to impact with the maximum reduction of 17% occurring at 150 m/s. A quasi-static analysis of the impact force prediction was also made based on the principle of energy conservation and the results were verified via experimental data.

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Fig. 1

Microstructure of a SiC fibrous composite used in this work. The 0/90 deg ply orientation is defined.

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Fig. 2

Partial support FOD configuration for the SiC Fibrous composite target material. L = unsupported span.

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Fig. 3

Impact damage morphology of the SiC fibrous composite target (left) and 1.59 mm diameter steel projectile (right) at a velocity of 100 m/s

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Fig. 4

Scanning electron microscopy micrograph of a typical cross section of impact damage on the SiC fibrous composite at 100 m/s

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Fig. 5

Representative (flexure) stress–strain curves for the as-received and impacted fibrous SiC composites

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Fig. 6

Post-impact strength as a function of impact velocity for the fibrous SiC composite impacted by 1.59 mm steel ball projectiles

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Fig. 7

Representative SEM micrograph of the fracture regions for the As-R and impacted specimens: (a) As-R and (b) 100 m/s

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Fig. 8

Normalized strength as a function of impact velocity for CMCs (SiC/SiC and ox-ox), monolithic ceramics, and SiC fibrous ceramic

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Fig. 9

Schematic illustrations of an impact event in partial support used in this work: (a) overall configuration and (b) projectile–target interaction

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Fig. 10

Contact yield stress versus Vickers hardness for a total of 15 different materials

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Fig. 11

Predicted impact force as a function of impact velocity for partial support in a fibrous SiC composite impacted by 1.59 mm steel ball projectiles. Different curves were created using varying coefficient of restitution e values.

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Fig. 12

Predicted impact damage size as a function of impact velocity for partial support FOD in a fibrous SiC composite. The solid lines represent the prediction: (a) prediction based on projectile deformation dp and (b) prediction based on target damage ds.



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