David Stobbe is a Deputy Group lead in the Nondestructive Evaluation group at Lawrence Livermore National Laboratory (LLNL) Materials Engineering Division, focusing on ultrasound techniques as they pertain to material characterization and defect detection. His primary research interests include laser-based ultrasound and solid mechanics. His work in these fields has resulted in numerous high impact journal publications and conference presentations.

Prior to joining LLNL, Dr. Stobbe worked as an expert witness in the field of mechanical engineering. As a licensed Professional Engineer, he testified in trials and depositions, in multiple state and federal courts, regarding the root cause failure mode of mechanical components and systems. He also previously worked as an opto-mechanical engineer at Northrop Grumman Corporation where he focused on structural and thermodynamic computational modeling and chaired the analysis tools implementation committee.

Currently, Dr. Stobbe develops novel optical ultrasound systems at LLNL to serve current and future mission critical needs. He enjoys mentoring new engineers and post-doctoral fellows and spending time with his family.

Ph.D. Mechanical Engineering, University of Colorado, Boulder, Colorado

MS Mechanical Engineering, The Georgia Institute of Technology, Atlanta, Georgia

BS Mechanical Engineering, University of Michigan, Ann Arbor, Michigan

Narumanchi, Venkatalakshmi V., Fatemeh Pourahmadian, Jordan Lum, Andrew Townsend, Joseph W. Tringe, David M. Stobbe, and Todd W. Murray. "Laser ultrasonic imaging of subsurface defects with the linear sampling method." Optics express 31, no. 5 (2023): 9098-9111.

Keene, Lionel, Brian Rogers, David Stobbe, Jordan Lum, and Joseph Tringe. "A combination interferometric and morphological image processing approach to rapid quality assessment of additively manufactured cellular truss core components." The International Journal of Advanced Manufacturing Technology (2023): 1-19.

Lum, Jordan S., Lionel T. Keene, Benjamin M. Goldberg, Erik Busby, Aric C. Rousso, Brett F. Bathel, Joshua M. Weisberger, Gregory M. Buck, David M. Stobbe, and James S. Stolken. "In Situ Optical Detection for Ultrasonic Characterization of Materials in a Mach 10 Hypersonic Wind Tunnel." Physical Review Applied 18, no. 4 (2022): 044062.

Morales, Rosa E., Kathryn J. Harke, Joseph W. Tringe, David M. Stobbe, and Todd W. Murray. "Real-time laser ultrasonic monitoring of laser-induced thermal processes." Scientific Reports 12, no. 1 (2022): 1-11.

Harke, Kathryn Jinae, Nicholas Calta, Joseph Tringe, and David Stobbe. "Laser-based ultrasound interrogation of surface and sub-surface features in advanced manufacturing materials." Scientific Reports 12, no. 1 (2022): 3309.

Gaikwad, Aniruddha, Tammy Chang, Brian Giera, Nicholas Watkins, Saptarshi Mukherjee, Andrew Pascall, David Stobbe, and Prahalada Rao. "In-process monitoring and prediction of droplet quality in droplet-on-demand liquid metal jetting additive manufacturing using machine learning." Journal of Intelligent Manufacturing 33, no. 7 (2022): 2093-2117.

Shu, Yening, Saptarshi Mukherjee, Tammy Chang, Abigail Gilmore, Joseph W. Tringe, David M. Stobbe, and Kenneth J. Loh. "Multi-Defect Detection in Additively Manufactured Lattice Structures Using 3D Electrical Resistance Tomography." Sensors 22, no. 23 (2022): 9167.

Leach, William, Jordan Lum, Kyle Champley, Stephen Azevedo, Casey Gardner, Hyojin Kim, David Stobbe, Andrew Townsend, and Joseph W. Tringe. "Fourier method for 3-dimensional data fusion of X-ray Computed Tomography and ultrasound." NDT & E International 127 (2022): 102600.

Mukherjee, Saptarshi, Hillary Fairbanks, Jordan Lum, David Stobbe, Gabe Guss, Andrew Townsend, Seemeen Karimi, and Joseph Tringe. "A Bayesian Inference Technique for Ultrasound Uncertainty Quantification in Metal Additive Manufacturing." Available at SSRN 4250943.

Chang, T., S. Mukherjee, N. N. Watkins, E. Benavidez, A. M. Gilmore, A. J. Pascall, and D. M. Stobbe. "Millimeter-wave electromagnetic monitoring for liquid metal droplet-on-demand printing." Journal of Applied Physics 130, no. 14 (2021): 144502.

Mukherjee, Saptarshi, Tammy Chang, Nicholas N. Watkins, and David M. Stobbe. "Physics-Based Inversion of a Millimeter-Wave Diagnostic for Liquid Metal Additive Manufacturing." IEEE Antennas and Wireless Propagation Letters (2021).

J. W. Tringe, D. M. Stobbe, G. R. Parker, L. Smilowitz, B. F. Henson, M. R. De Haven, A. J. Ruch, B. W. White, J. E. Reaugh, and K. S. Vandersall, “Observation of asymmetric explosive density evolution in the deflagration-to-detonation transition for porous explosives,” Journal of Applied Physics 129, 035901 (2021).

T. Chang, S. Mukherjee, N. Watkins, D. M. Stobbe, O. Mays, E. V. Baluyot, A. J. Pascall and J. W. Tringe, “In-situ monitoring for liquid metal jetting using a millimeter-wave impedance diagnostic.” Scientific Reports 10, 22325 (2020).

D. M. Stobbe and T. W. Murray, “Scattering of Lamb waves with conical dispersion in elastic plates,” Scientific Reports 9, 15216 (2019).

D. M. Stobbe, “Lamb Waves with Conical Dispersion at Zero Wavenumber,” Doctoral Thesis, University of Colorado Boulder, 2018.

J. S. Lum, D. M. Stobbe, M. A. Borden, and T. W. Murray, “Photoacoustic technique to measure temperature effects on microbubble viscoelastic properties,” Applied Physics Letters, 112, 11905, 2018.

D. M. Stobbe and T. W. Murray, “Conical Dispersion of Lamb waves in Elastic Plates,” Physical Review B. 00, 004100, 2017

D. M. Stobbe and T. W. Murray, “Dirac cone Dispersion of Lamb waves in plates,” Ultrasonic Symposium, 2017 IEEE International conference proceedings.

I. A. Veres, C. Grünsteidl, D. M. Stobbe, and T. W. Murray, “Broad-angle negative reflection and focusing of elastic waves from a plate edge”, Physical Review B 93, 174304, 2016.

T. W. Murray, A. Bakir, D. M. Stobbe, M. J. Kotelyanskii, R. A. Mair, M. Mehendale, X. Ru, J. D. Cohen, M. T. Schulberg, P. Mukundhan, and T. J. Kryman, “A New In-line Laser-based Acoustic Technique for Pillar Bump Metrology”, International Symposium on Microelectronics: Fall 2015, Vol. 2015, No. 1.

D. M. Stobbe, “Acoustoelasticity in 7074-T651 Aluminum and Dependence of Third Order Elastic Constants on Fatigue Damage,” Master’s Thesis, Georgia Institute of Technology, 2005.

J. E. Michaels, T. E. Michaels, B. Mi, A. C. Cobb and D. M. Stobbe, "Self-Calibrating Ultrasonic Methods for In-Situ Monitoring of Fatigue Crack Progression," Review of Progress in Quantitative Nondestructive Evaluation, Vol. 24B, D. O. Thompson and D. E. Chimenti (Eds.), American Institute of Physics, pp. 1765-1772, 2005.

F. Cao, D. Stobbe, T.K. Nandy and T.M. Pollock, “Oxidation of Ruthenium AluminideBased Alloys: The Role of Microstructure and Platinum Additions”, J. Intermetallics 15, 1, 2005.