Additive Manufacturing Benchmarks 2022 (AM-Bench 2022): Monday Benchmarks
Program Organizers: Brandon Lane, National Institute of Standards and Technology; Lyle Levine, National Institute of Standards and Technology
Monday 10:20 AM
August 15, 2022
Room: Regency Ballroom I & II
Location: Hyatt Regency Bethesda
Session Chair: Edwin Schwalbach, Air Force Research Labroatory
10:20 AM Plenary
Supporting the Simulation Community with Benchmark Measurements for Additive Manufacturing: Lyle Levine1; Brandon Lane1; 1National Institute of Standards and Technology
The Additive Manufacturing Benchmark Series (AM Bench) provides the AM community with rigorous measurement datasets for model validation that are permanently archived and freely available. In 2022, through a collaboration that includes nearly a hundred scientists from 11 divisions within the National Institute of Standards and Technology (NIST) and 19 external organizations, AM Bench has conducted 34 modeling challenges for the AM community and released eight comprehensive sets of metal and polymer AM benchmark data. Here, the AM Bench 2022 organization, goals, collaborators, measurements, challenges, and data management systems will be introduced.
10:45 AM Plenary
Metal 3D Builds and In-situ Measurements for the 2022 Additive Manufacturing Benchmark Challenges: Brandon Lane1; Ho Yeung1; David Deisenroth1; Sergey Mekhontsev1; Lyle Levine1; Thien Phan2; 1National Institute of Standards and Technology; 2Lawrence Livermore National Laboratory
This talk describes the planning and execution of the IN718 three-dimensional builds of bridge-structure parts conducted on the Additive Manufacturing Metrology Testbed (AMMT) at NIST for the AMB2022-01 and -02 challenge sets. The AMMT is first introduced, including background on the fully custom laser-galvo control capabilities, and newly upgraded high-speed in-situ thermographic melt pool measurement system. The machine parameters and scan strategies for fabricated bridge structures are then detailed, including custom-designed laser scan strategies. The analysis and results from in-situ thermographic measurements are then detailed, including thermal calibration procedures, and derivation of ‘time above melt’ and ‘cooling rate’ data features from the high-speed thermal video. Finally, details are provided on the compilation, access, and use of the voluminous scan strategy and in-situ measurement datasets are provided.
11:20 AM Plenary
Voxel-scale Precision in Vat Photopolymerization Additive Manufacturing: Jason Killgore1; Callie Higgins1; Ben Caplins2; Cameron Miller3; Yuqin Zong1; Jeff Stansbury4; Gannon Kehe4; 1National Institute of Standards and Technology; 2National Instutute of Standards and Technology; 3University of Virginia; 4University of Colorado, Anschutz
Vat photopolymerization, enabled by advances in high-resolution display technologies (e.g. LCD, DLP) to locally cure liquid resin into solid polymer, prints millions of voxels per layer simultaneously in a few seconds or less. Fundamental understanding and control of the printing process with geometrically and mechanically precise voxels requires characterization of printer hardware and resultant parts at sub-pixel or sub-voxel length scales. Despite the advanced light engines, resultant parts exhibit defects such as over/under-polymerization, 3-dimensional anisotropy, weakened layer interfaces and more. In this presentation, we examine the formation of these defects starting from the individual light-pixels in the printer, through to the liquid resin and eventually solid parts. We introduce novel, multiscale measurement tools that elucidate the small-scale printing process in both space and time. Finally, we discuss how the 2022 benchmark data set “Vat Photopolymerization Measurements of Cure Depth and Print Fidelity Vs.Varied Exposure Duration, Photopattern Dimensions, and Resin Characteristics” relates to the fundamental printing process.
11:50 AM Question and Answer Period