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Search Publications by: Shawn P. Moylan (Fed)

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Displaying 1 - 25 of 116

Laser Beam Metrology for AM-Bench 2022: Approaches, Results, and Lessons Learned

April 1, 2025
Author(s)
David Deisenroth, Jordan Weaver, Sergey Mekhontsev, Steven Grantham, Shawn P. Moylan
One of key parameters of additive manufacturing by laser powder bed fusion of metal parts (PBF-LB/M) is the power density distribution (PDD) of the process laser beam. This paper describes the methods used to measure the beam PDD, discussing well

An Interlaboratory Study for Assessing Repeatability and Reproducibility of the Data Generated by Rotating Drum Powder Rheometers Part 1: Granudrum

May 3, 2024
Author(s)
Vipin Tondare, Justin Whiting, Adam L. Pintar, Shawn P. Moylan, Aurelien Neveu, Filip Francqui
The National Institute of Standards and Technology (NIST) organized an interlaboratory study to assess the repeatability and reproducibility of the data generated by two commercially available rotating drum powder rheometers namely, Granudrum and

Powder Spreading Testbed for Studying the Powder Spreading Process in Powder Bed Fusion Machines

November 29, 2023
Author(s)
Justin Whiting, Eric Whitenton, Aniruddha Das, Vipin Tondare, Jason Fox, Michael McGlauflin, Alkan Donmez, Shawn P. Moylan
The spreading of powder is an integral part of powder bed fusion-based additive manufacturing technologies; however, due to the complex nature and the number of interactions between particles, studying the powder spreading process is difficult. In order to

The Strategy for American Leadership in High-Consequence Additive Manufacturing

September 9, 2022
Author(s)
Mark Benedict, Shawn P. Moylan, Souhail Al-Abed, Cindy Ashforth, Y. Kevin Chou, Matthew Di Prima, Alaa Elwany, Michael Gorelik, Astrid Lewis, Todd Luxton, Blake Marshall, William Mullins, Linda Sapochak, Richard Russell, James A. Warren, Douglas Wells
Over the past decade, a consistent theme in enhancing U.S. global competitiveness has been the need for U.S. leadership in critical advanced manufacturing technologies. Additive manufacturing (AM), also known as 3D Printing, has been among those critical

A Comparison of Particle Size Distribution and Morphology Data acquired using Lab-based and Commercially Available Techniques: Application to Stainless Steel Powder

November 17, 2021
Author(s)
Justin Whiting, Edward Garboczi, Vipin Tondare, John Henry J. Scott, Alkan Donmez, Shawn P. Moylan
The particle size distribution (PSD) and particlemorphology ofmetal powders undoubtedly affects the quality of parts produced by additivemanufacturing (AM). It is, therefore, crucial to accurately knowthe PSD and morphology of these powders. There exist

Inert Gas Flow Speed Measurements in Laser Powder Bed Fusion Additive Manufacturing

October 19, 2021
Author(s)
Jordan Weaver, Alec Schlenoff, David Deisenroth, Shawn P. Moylan
Laser powder bed fusion (LPBF) is an additive manufacturing technology that uses a laser to selectively melt powder feedstock to build parts in a layer-by-layer process. For metals-based LBPF additive manufacturing, the interaction of the laser and powder

Investigation of the Effect of Artificial Internal Defects on the Tensile Behavior of Laser Powder Bed Fusion 17-4 Stainless Steel Samples: Simultaneous Tensile Testing and X-Ray Computed Tomography

October 5, 2021
Author(s)
Felix Kim, Shawn P. Moylan, Thien Q. Phan, Edward Garboczi
Insufficient data are available to fully understand the effects of metal additive manufacturing (AM) defects for widespread adoption of the emerging technology. Characterization of failure processes of complex internal geometries and defects in metal AM

A Prototype of a Standard Spreadability Tester for Additive Manufacturing

June 23, 2021
Author(s)
Justin G. Whiting, Vipin Tondare, Shawn P. Moylan, Alkan Donmez
We describe a simple device called Standard Spreadability Tester (SST). The idea behind the SST is that instead of trying to predict how a powder will spread using the powder's intrinsic properties (e.g., PSD, morphology, surface, and chemical makeup) or

Chapter 8: Machine Performance Evaluation

September 22, 2020
Author(s)
Shawn Moylan
Machine performance evaluation is vital for objectively demonstrating that a machine can meet specification, standards and quality management system, and for allowing users to make informed decisions on how to best use their resources. Although additive

Residual Stress in Additive Manufactured Nickel Alloy 625 Parts

June 29, 2018
Author(s)
Lindsey B. Bass, Justin L Milner, Thomas H. Gnaupel-Herold, Shawn P. Moylan
One of the key barriers to widespread adoption of additive manufacturing (AM) for metal parts is the build-up of residual stresses. In the laser-based powder bed fusion process, a laser selectively fuses metal powder layer by layer, generating significant

Literature Review of Metal Additive Manufacturing Defects

May 17, 2018
Author(s)
Felix H. Kim, Shawn P. Moylan
Additive manufacturing (AM) is a revolutionary manufacturing technique, which is expected to reshape the future manufacturing industries. While various materials are used in AM, metal AM is expected to provide a high impact to the industries by producing