JOINT AMSL/GAS TURBINE LABORATORY SEMINAR
DATE: Tuesday, 4.4.23
TIME: 4:00pm
LOCATION: 31-270
SPEAKER: Dr. Luke C. Sheridan, USAF AFMC AFRL
TOPIC: Novel Lifting Techniques for Additive Manufacturing Applications
ABSTRACT:
Additive manufacturing (AM) introduces microstructural and material complexities that are not as prevalent in many traditionally manufactured materials and components. Complicated microstructure induced from high thermal gradients and large cooling rates introduce interesting crack growth behavior, and the building block style of overlapping single weld pools often create opportunities for lack of fusion defects, gas porosity, and keyhole porosity to manifest in AM materials. These complexities can often appear to complicate traditional methods of lifing, but through the use and further development of historical lifing tools used for traditionally manufactured materials and components, lifing can be performed with some ease and accuracy. This talk highlights some recent developments in lifing AM components, and walks through the enhancement of historical lifing tools to accommodate the idiosyncrasies of AM alloys in terms of fatigue crack initiation and propagation to failure. Additionally, initial applications to aerospace and turbine engine applications are described briefly, and new insights and inspection methodologies are described. This talk provides a good starting point for understanding the complexities of life prediction for AM materials, and introduces new routes for further research and application in the aerospace community.
BIO:
Dr. Luke Sheridan is a mechanical engineer with the Aerospace Systems Directorates Turbine Engine Division at Wright Patterson Air Force Base. He is currently involved in research related to the structural integrity and performance of turbine engine components manufactured under both traditional and advanced manufacturing methods. His responsibilities include material and component evaluation for research and fielded components using experimental and analytical methods to assess various structural dynamic behavior and resulting failure mechanisms. He is a recognized advanced manufacturing subject matter expert for numerous in-house and industry programs including two large joint demonstrations program with partners from across the Air Force and the DoD. Dr. Sheridan also currently serves as co-locate to the Air Force Life Cycle Management Center’s Propulsion Directorate and facilitates communication between the two organizations and guides technology and maintenance roadmap development in cooperation with the Propulsion Technology Office.
Dr. Sheridan joined the Air Force via the Pathways internship program in May 2016 as a first year Ph.D. student and was assigned to the Structural Integrity Branch of the Turbine Engine Division. Within one and half years, he transitioned to full civil service and strengthened his contribution to the Turbine Engine and surrounding communities as a recognized additive manufacturing expert especially in the fields of structural mechanics and lifing. Prior to his position with the Air Force Research Laboratory (AFRL), Dr. Sheridan attended Wright State University where he received a B.S. and M.S. of Mechanical Engineering. In March 2020, Dr. Sheridan also earned his Ph.D. in Engineering from Wright State University. Dr. Sheridan’s CV includes 18 Journal papers (~190 citations), 5 book chapters, and 25 conference presentations and invited talks.