Opportunity at National Institute of Standards and Technology (NIST)
Ultrasonic Nondestructive Evaluation of Additively Manufactured Alloys
Material Measurement Laboratory, Applied Chemicals and Materials Division
Please note: This Agency only participates in the February and August reviews.
|Hrabe, Nikolas Wilson
|Johnson, Ward L.
Additive manufacturing (AM) by laser or electron-beam melting of metal powder has emerged in this century as a transformational technology for fabricating near-net-shape metallic parts and generating microstructures that are infeasible with conventional metallurgy. However, the degree of commercial adoption of AM parts is impeded by current limitations on material validation, which are linked to limitations on post-process nondestructive evaluation (NDE) with conventional methods. This project seeks to develop innovative ultrasonic methods for characterizing AM alloys and identifying connections between as-manufactured acoustic properties and in-service mechanical performance. Rather than focusing on time-consuming and resolution-limited acoustic imaging of individual flaws, the project seeks to develop resonance methods and associated physical models for characterizing acoustic damping, nonlinearity, and/or changes in elastic stiffness that arise from distributions of performance-degrading defects.
Additively Manufactured Materials; Nondestructive Evaluation; NDE; Ultrasonics; Resonant Acoustics; Defects; Anelasticity; Nonlinearity
Open to U.S. citizens
Open to Postdoctoral applicants