MIE Seminar: Dr. Luz Sotelo, Assistant Professor, Mechanical Engineering, Purdue University, "Ultrasonic in situ measurements for hybrid directed energy deposition"

Content

Abstract

Hybrid additive manufacturing (AM) of metals involves the coupling of secondary processes or energy sources either cyclically or at the same time as the additive process. These hybrid approaches enable improved control over local material properties and global performance. Nonetheless, the resulting multiscale material heterogeneity presents nontrivial characterization challenges beyond defect detection, including knowledge of microstructure and residual stress. In this context, ultrasonic nondestructive evaluation (NDE) approaches offer the ability to directly interrogate microstructure and elasticity changes via elastic wave-material interactions. This talk presents the design and demonstration of the first ultrasonic in situ monitoring system for hybrid AM, specifically directed energy deposition (DED) with subtractive capabilities. In situ monitoring experiments with Ti6Al4V showed the evolution of material properties with the additive and subtractive steps in agreement with ex-situ measurements. Thus, in situ material property interrogation is demonstrated for hybrid AM, while advantages and limitations are discussed.

Bio

Dr. Luz D. Sotelo is an Assistant Professor of Mechanical Engineering at Purdue University specializing in acoustics, nondestructive evaluation (NDE), and convergent manufacturing. Her research advances the safe adoption of additive manufacturing through modeling and experimental ultrasonic wave propagation, quantifying material properties nondestructively, and applying multi-modal NDE for holistic characterization. She earned her Ph.D. from the University of Nebraska–Lincoln and has held appointments at the U.S. Naval Research Laboratory with support from NASEM (NRC RAP) and ONR.. Dr. Sotelo is the Purdue lead in an NSF Future Manufacturing award and has received national recognition from Great Minds in STEM and the Society of Hispanic Professional Engineers.