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Displaying 326 - 333 of 333

The effect of powder on cooling rate and melt pool length measurements using in situ thermographic techniques

August 9, 2017

Author(s)

Jarred C. Heigel, Brandon M. Lane

High-speed thermal cameras enable in situ measurement of the temperatures in and around melt pools generated during powder bed fusion processes. These measurements can be used to validate models, to monitor the process, and to better understand material

THERMAL PROPERTY MEASUREMENT METHODS AND ANALYSIS FOR AM SOLIDS AND POWDERS

August 9, 2017

Author(s)

Justin G. Whiting, Brandon M. Lane, Kevin Chou, Bo Cheng

Thermal properties of additive manufacturing (AM) solids and precursor materials are important factors for build process and part performance. However, measured thermal properties are not well documented, despite being used extensively in AM modeling and

INVESTIGATING GREY-BOX MODELING FOR PREDICTIVE ANALYTICS IN SMART MANUFACTURING

August 8, 2017

Author(s)

Peter O. Denno, Yan Lu, Paul Witherell, Sundar Krishnamurty, Ian Grosse, Douglas Eddy

This paper develops a grey-box modeling approach that combines manufacturing knowledge-based (white-box) models with statistical (black-box) metamodels to improve model reusability and predictability. A white-box model can utilize different types of

Performance Characterization of Process Monitoring Sensors on the NIST Additive Manufacturing Metrology Testbed

August 8, 2017

Author(s)

Brandon Lane, Steven Grantham, Ho Yeung, Clarence Zarobila, Jason Fox

Researchers and equipment manufacturers are developing in-situ process monitoring techniques with the goal of qualifying additive manufacturing (AM) parts during a build, thereby accelerating the certification process. Co-axial melt pool monitoring (MPM)

A NOVEL TRANSITION REGION REPRESENTATION FOR ADDITIVE MANUFACTURING FOR GRADED MATERIALS, STRUCTURES AND TOLERANCES

August 7, 2017

Author(s)

Gaurav Ameta, Paul W. Witherell

Additive manufacturing (AM) has enabled fine grain con-trol over heterogeneous materials in ways that were not previously possible. This paper presents a novel method for representing and communicating heterogeneous ma-terials based structures that include

Measurement of process dynamics through coaxially aligned high speed NIR imaging in laser powder bed fusion additive manufacturing

June 23, 2017

Author(s)

Jason C. Fox, Brandon M. Lane, Ho Yeung

Fatigue Properties of a Titanium Alloy (Ti-6Al-4V) Fabricated Via Electron Beam Melting (EBM): Effects of Internal Porosity and Residual Stress

January 1, 2017

Author(s)

Nikolas W. Hrabe, Thomas H. Gnaeupel-Herold, Timothy P. Quinn

A deeper understanding of microstructural influences on the fatigue properties of Ti-6Al-4V made using electron beam melting (EBM) is necessary before this material can be safely implemented in medical devices and aerospace components. Investigation of two

Costs, Benefits, and Adoption of Additive Manufacturing: A Supply Chain Perspective

June 30, 2016

Author(s)

Douglas Thomas

Currently, additive manufactured products represent less than one percent of all manufactured products in the US; however, as the costs of additive manufacturing systems decrease, this technology may become widely adopted and change the supplier

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