Troy Hartwig

Kansas City National Security Campus

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Robert G. Landers

University of Notre Dame

Edward C. Kinzel

University of Notre Dame

Douglas A. Bristow

Missouri University of Science and Technology

Ben Brown

National Nuclear Security Administration

Jason Blough

Michigan Technological University

Tristan Cullom

Missouri University of Science and Technology

Kevin Johnson

Target (United States)

David Soine

Sandia National Laboratories

Brian West

Marshall Space Flight Center

Andrew Barnard

Oregon State University

Cooperative Institutions

Missouri University of Science and Technology

Michigan Technological University

National Nuclear Security Administration

Kansas City National Security Campus

University of Notre Dame

Purdue University West Lafayette

University of Illinois Urbana-Champaign

Bellingham Technical College

Honeywell Federal Manufacturing and Technologies (United States)

Honeywell (United States)

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Frequency Domain Measurements of Melt Pool Recoil Force Using Modal Analysis

Research Square (Research Square) (2020)

Tristan Cullom Cody Lough Nicholas Altese Douglas A. Bristow Robert G. Landers

Abstract Recoil pressure is a critical factor affecting the melt pool dynamics during Laser Powder Bed Fusion (LPBF) processes. Recoil pressure depresses the melt pool, providing layer-to-layer fusion without introducing porosity. If the recoil pressure is too low, the process operates in a conduction mode where layers will not properly fuse, while excessive recoil pressure leads to a keyhole mode, which results in gas porosity. Direct recoil pressure measurements are challenging because it is localized over an area proportionate to the laser spot size producing a force in the mN range. This paper reports a vibration-based approach to quantify the recoil force exerted on a part in a commercial LPBF machine. The measured recoil force is consistent with estimates from high speed synchrotron imaging of entrained particles, and the results show that the recoil force scales with applied laser power and is inversely related to the laser scan speed. These results facilitate further studies of melt pool dynamics and have the potential to aid process development for new materials.

Recoil

Elastic recoil

10.21203/rs.3.rs-126149/v1

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Citations (1)

Frequency Response Inspection of Additively Manufactured Parts for Defect Identification

Kevin Johnson Jason Blough Andrew Barnard Troy Hartwig Ben Brown

Identification

10.26153/tsw/17230

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Citations (2)

Adjustable Shock Test Sled for Haversine Pulses at 250 fps

Troy Hartwig Brent Hower Aaron Seaholm

New test requirements were developed by Sandia National Laboratory to simulate a regime of shock testing not previously performed at the Kansas City Plant operated by Honeywell Federal Manufacturing & Technologies. These environments were unique in that they involved amplitude of shock >1000g with relatively long pulse durations (greater 5 ms but less than 10 ms) and involved velocity changes up to 235 ft/sec. Ten months were available to develop, design, manufacture and prove-in this new capability. We designed a new shock sled to deliver this new family of shock environments in a laboratory test. The performance range of the new sled includes five specific shocks (1000 g – 8 ms, 1300 - 6 ms, 1500 g – 5.4 ms, 1950 g – 6 ms, 2250 g – 5.4 ms; all haversine shaped), and it also incorporates adjustability to accommodate new shocks within this range. These shock environments result in velocity changes ranging from 160 fps to 250 fps. The test sled accommodates test articles weighing up to 20 lbs and measuring up to 10” along any axis.

Ranging

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Towards Defect Detection in Metal SLM Parts Using Modal Analysis "Fingerprinting"

James S. Urban Nick E. Capps Brian West Troy Hartwig Ben Brown

10.26153/tsw/16969

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Frequency Domain Measurements of Melt Pool Recoil Pressure using Modal Analysis and Prospects for In-Situ Non-Destructive Testing

Tristan Cullom Nicholas Altese Douglas A. Bristow Robert G. Landers Ben Brown

This work was funded by the Department of Energy’s Kansas City National Security Campus which is operated and managed by Honeywell Federal Manufacturing Technologies, LLC under contract number DE-NA0002839.

Recoil

10.26153/tsw/17372

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Relating Processing of Selective Laser Melted Structures to their Material and Modal Properties

Nicholas Capps James S. Urban Brian West Cody Lough Adriane Repogle

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Dynamic Defect Detection in AM Parts using FEA Simulation

Kevin Johnson Jason Blough Andrew Barnard Troy Hartwig Ben Brown

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