Graduate student Sydney Wickett, Master of Science in Mechanical Engineering, will defend her thesis titled “Delineating Torsional Fatigue Response and Microstructural Defects Governing Failure of Laser-Powder Bed Fusion Inconel 718 Subject to Extreme Environments.”

• Date: Friday, April 18
• Time: 3:30-5 p.m.
• Location: IST-1068

Abstract:

The use of additive manufacturing to produce metal components has become of great interest in the aerospace, energy propulsion, and defense industries. The operating environment of aircraft gas turbine engine components consists of a multiaxial stress state composed of a combination of torsional and axial loading at elevated temperatures. With the wide adoption of the metal additive manufacturing technology, it becomes necessary to assess the capability of these additively manufactured components in safely withstanding these in-service loading conditions. The key concern with additively manufactured metal components is their reduced fatigue performance, which has been directly linked to the presence of microstructural defects introduced through the additive manufacturing process. This novel study aims to assess the torsional fatigue performance and role of microstructural defects in impacting torsional fatigue performance for additively manufactured Inconel 718 at typical operating temperatures, to begin to provide insight into its reliability when subject to a high temperature multiaxial stress state environment, characteristic of those experienced by gas turbine engine components.

Acknowledgments:

This study is supported under the National Science Foundation (NSF) Grant No. (2055027), awarded to Dr. Sanna F. Siddiqui.

Please join us!

For more information, contact Dr. Sanna Siddiqui.