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Abdalla R. Nassar
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Journal Articles

Flaw Detection in Multi-Laser Powder Bed Fusion Using In Situ Coaxial Multi-Spectral Sensing and Deep Learning

Amit Surana, Matthew E. Lynch, Abdalla R. Nassar, Greg C. Ojard, Brian A. Fisher, David Corbin, Ryan Overdorff
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Research Papers
J. Manuf. Sci. Eng. May 2023, 145(5): 051005.
Paper No: MANU-22-1330
https://doi.org/10.1115/1.4056540
Published Online: January 19, 2023
View Article titled, Flaw Detection in Multi-Laser Powder Bed Fusion Using In Situ Coaxial Multi-Spectral Sensing and Deep Learning
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Topics: Flaw detection, Lasers, Sensors, Image segmentation, Resolution (Optics), Semantics, Time series, Testing
Journal Articles

Ultrasonic Rayleigh Wave Interrogation of Directed Energy Deposition Ti–6Al–4V Having a Rough Surface

Chaitanya Bakre, Abdalla R. Nassar, Edward W. Reutzel, Cliff J. Lissenden
Journal: Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems
Publisher: ASME
Article Type: Research Papers
ASME J Nondestructive Evaluation. August 2022, 5(3): 031008.
Paper No: NDE-22-1003
https://doi.org/10.1115/1.4054539
Published Online: June 20, 2022
View Article titled, Ultrasonic Rayleigh Wave Interrogation of Directed Energy Deposition Ti–6Al–4V Having a Rough Surface
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Topics: Lasers, Polishing, Rayleigh waves, Surface roughness, Waves, Transducers, Ultrasonics
Proceedings Papers

Build Height Control in Directed Energy Deposition Using a Model-Based Feed-Forward Controller

Qian Wang, Jianyi Li, Abdalla R. Nassar, Edward W. Reutzel, Wesley Mitchell
Proc. ASME. DSCC2018, Volume 2: Control and Optimization of Connected and Automated Ground Vehicles; Dynamic Systems and Control Education; Dynamics and Control of Renewable Energy Systems; Energy Harvesting; Energy Systems; Estimation and Identification; Intelligent Transportation and Vehicles; Manufacturing; Mechatronics; Modeling and Control of IC Engines and Aftertreatment Systems; Modeling and Control of IC Engines and Powertrain Systems; Modeling and Management of Power Systems, V002T23A003, September 30–October 3, 2018
Publisher: American Society of Mechanical Engineers
Paper No: DSCC2018-9058
https://doi.org/10.1115/DSCC2018-9058
View Paper titled, Build Height Control in Directed Energy Deposition Using a Model-Based Feed-Forward Controller
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Topics: Control equipment, Feedforward control, Feedback, Lasers, Geometry, Additive manufacturing, Maintenance, Manufacturing
Journal Articles

Effect of Substrate Thickness and Preheating on the Distortion of Laser Deposited Ti–6Al–4V

David J. Corbin, Abdalla R. Nassar, Edward W. Reutzel, Allison M. Beese, Pan Michaleris
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Research-Article
J. Manuf. Sci. Eng. June 2018, 140(6): 061009.
Paper No: MANU-17-1390
https://doi.org/10.1115/1.4038890
Published Online: March 23, 2018
View Article titled, Effect of Substrate Thickness and Preheating on the Distortion of Laser Deposited Ti–6Al–4V
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Topics: Lasers, Temperature, Displacement
Journal Articles

An Extended Lumped-Parameter Model of Melt–Pool Geometry to Predict Part Height for Directed Energy Deposition

Jianyi Li, Qian Wang, Panagiotis (Pan) Michaleris, Edward W. Reutzel, Abdalla R. Nassar
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Research-Article
J. Manuf. Sci. Eng. September 2017, 139(9): 091016.
Paper No: MANU-17-1126
https://doi.org/10.1115/1.4037235
Published Online: July 26, 2017
View Article titled, An Extended Lumped-Parameter Model of Melt–Pool Geometry to Predict Part Height for Directed Energy Deposition
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Topics: Dynamics (Mechanics), Geometry, Heat, Lasers, Temperature, Thin wall structures
Journal Articles

Physics-Based Multivariable Modeling and Feedback Linearization Control of Melt-Pool Geometry and Temperature in Directed Energy Deposition

Qian Wang, Jianyi Li, Michael Gouge, Abdalla R. Nassar, Panagiotis (Pan) Michaleris, Edward W. Reutzel
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Research-Article
J. Manuf. Sci. Eng. February 2017, 139(2): 021013.
Paper No: MANU-15-1671
https://doi.org/10.1115/1.4034304
Published Online: September 21, 2016
View Article titled, Physics-Based Multivariable Modeling and Feedback Linearization Control of Melt-Pool Geometry and Temperature in Directed Energy Deposition
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Topics: Geometry, Lasers, Temperature, Modeling, Feedback, Steady state, Physics
Journal Articles

Predicting Microstructure From Thermal History During Additive Manufacturing for Ti-6Al-4V

Jeff Irwin, Edward W. Reutzel, Pan Michaleris, Jay Keist, Abdalla R. Nassar
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Research-Article
J. Manuf. Sci. Eng. November 2016, 138(11): 111007.
Paper No: MANU-15-1466
https://doi.org/10.1115/1.4033525
Published Online: June 23, 2016
View Article titled, Predicting Microstructure From Thermal History During Additive Manufacturing for Ti-6Al-4V
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Topics: Additive manufacturing, Errors, Simulation, Temperature, Equilibrium (Physics), Lasers, Modeling, Materials properties, Nucleation (Physics), Optimization