Ersan Ustundag

California Institute of Technology, Pasadena, California

In-Situ Investigation of Advanced Structural

Coatings and Composites

NASA/CR—2003-212303

June 2003
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Ersan Ustundag

California Institute of Technology, Pasadena, California

In-Situ Investigation of Advanced Structural

Coatings and Composites

NASA/CR—2003-212303

June 2003

National Aeronautics and

Space Administration

Glenn Research Center

Prepared under Grant NAG3–2686
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This report contains preliminary

findings, subject to revision as

analysis proceeds.

The Propulsion and Power Program at

NASA Glenn Research Center sponsored this work.

Available electronically at http://gltrs.grc.nasa.gov
In-Situ Investigation of Advanced Structural Coatings and Composites

Ersan Ustundag

California Institute of Technology

Pasadena, California

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In-Situ Investigation of Advanced Structural Coatings and Composites

Ersan Ustundag

X-ray diffraction; Neutron diffraction; Creep; Si3N4; Thermal barrier coatings

Unclassified -Unlimited

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California Institute of Technology

Pasadena, California 99125

Project Manager, Serene Farmer, Materials Division, NASA Glenn Research Center, organization code 5130,

216–433–3289.

The premise of this project is a comprehensive study that involves the in-situ characterization of advanced coatings and

composites by employing both neutron and x-ray diffraction techniques in a complementary manner. The diffraction

data would then be interpreted and used in developing or validating advanced micromechanics models with life

prediction capability. In the period covered by this report, basic work was conducted to establish the experimental

conditions for various specimens and techniques. In addition, equipment was developed that will allow the in-situ

studies under a range of conditions (stress, temperature, atmosphere, etc.).