Conferences

In Situ Neutron Transmission Bragg Edge Measurements of Strain Fields Near Fatigue Cracks Grown in Air and in Hydrogen

August 14, 2017

Author(s)

Matthew Connolly, Peter Bradley, Andrew Slifka, Elizabeth S. Drexler

In situ transmission Bragg edge measurements of the strain field were performed near cracks grown in air and in hydrogen. Through the use of a novel test...

A Photonic MEMS Accelerometer with a Low-Finesse Hemispherical Microcavity Readout

August 13, 2017

Author(s)

Yiliang Bao, Feng Zhou, Thomas W. LeBrun, Jason J. Gorman

This paper describes the design, fabrication, and testing of a photonic MEMS accelerometer that uses a hemispherical microcavity to transduce the motion of the...

Characterization of the Dimensions of Internal Gap in a Glass Artifact Using a Laser Triangulation Probe

August 11, 2017

Author(s)

Wei Ren, Theodore D. Doiron, John R. Stoup, Eric S. Stanfield

High-accuracy Coordinate Measuring Machine (CMM) is always a good option to measure the dimensions on a variety of artifacts. However, due to the large length...

Scaling Methods for Dynamic Building System Simulation in an HVACSIM+ Environment

August 9, 2017

Author(s)

Zhelun Chen, Jin Wen, Anthony Kearsley, Amanda Pertzborn

A robust and efficient nonlinear algebraic and differential equations solver is increasingly essential as the scale of dynamic building system simulation grows...

Towards a Semantically-Enabled Control Strategy for Building Simulations: Integration of Semantic Technologies and Model Predictive Control

August 9, 2017

Author(s)

Parastoo Delgoshaei, Mark Austin, Amanda Pertzborn, Mohammad Heidarinejad, Vikas Chandan

State-of-the-art building simulation control methods incorporate physical constraints into their mathematical models, but omit implicit constraints associated...

Optimality Conditions for Constrained Least-Squares Fitting of Circles, Cylinders, and Spheres to Establish Datums

August 9, 2017

Author(s)

Craig M. Shakarji, Vijay Srinivasan

This paper addresses the combinatorial characterizations of the optimality conditions for constrained least-squares fitting of circles, cylinders, and spheres...

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...

In-situ Elastic Strain Mapping via EBSD of Micro-Sized Specimens

August 9, 2017

Author(s)

Mark McLean, William A. Osborn

A Collaborative Data Management System for Additive Manufacturing

August 9, 2017

Author(s)

Yan Lu, Paul W. Witherell, M A. Donmez

As additive manufacturing (AM) continues to mature as a production technology, the limiting factors that have hindered its adoption in the past still exist, for...

The Science Behind Community Resilience Assessment: An Overview of the Center for Risk-Based Community Resilience Planning

August 9, 2017

Author(s)

Bruce Ellingwood, John W. van de Lindt, Therese P. McAllister

Community resilience depends on the performance of the built environment and on supporting social, economic and public institutions which are essential for re...

Continuous Laser Scan Strategy for Faster Build Speeds in Laser Powder Bed Fusion System

August 9, 2017

Author(s)

Ho Yeung, Brandon Lane, Jason Fox, Felix Kim, Jarred C. Heigel, Jorge Neira

Research has shown significant influence of laser scan strategy on various part qualities in the laser powder bed fusion additive manufacturing process. The...

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...

DEVELOPING AN ACTIVITY MODEL FOR SELECTING DIMENSIONAL-METROLOGY SYSTEMS IN INSPECTION PLANNING

August 9, 2017

Author(s)

Shaw C. Feng, Thomas R. Kramer, John A. Horst, Thomas D. Hedberg Jr., Allison Barnard Feeney

ties and information flow in dimensional metrology systems based on design information and measurement requirements from manufacturers. The purpose 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...

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...

Strain Measurement of 3D Structured Nanodevices by EBSD

August 7, 2017

Author(s)

William Osborn, Lawrence Henry Friedman, Mark D. Vaudin

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...

Verification of Coexistence Measurement Methods: Radiated Anechoic and Open Environment

August 6, 2017

Author(s)

Ryan T. Jacobs, Jason Coder, Nickolas J. LaSorte

With an abundance of wireless devices saturating daily life, the ablilty of devices to coexist among other devices is of increasing interest. While standards...

Isotropy Study for OTA Measurements in a Loaded Reverberation Chamber

August 6, 2017

Author(s)

Damir Senic, Diego Cavaliere, Matt V. North, Maria G. Becker, Kate Remley, Chih-Ming Wang, Christopher L. Holloway

A GENERALIZED METHOD FOR FEATURIZATION OF MANUFACTURING SIGNALS, WITH APPLICATION TO TOOL CONDITION MONITORING

August 5, 2017

Author(s)

Max Ferguson, Kincho Law, Raunak Bhinge, Yung-Tsun Lee

The application of machine learning techniques in the manufacturing sector provides opportunities for increased production efficiency and product quality. In...

SEM/EDS Trace Analysis: Limits Imposed by Fluorescence of the Detector

August 4, 2017

Author(s)

Dale E. Newbury, Nicholas W. Ritchie, Michael J. Mengason, Keana C. Scott

Elemental trace analysis by electron-excited x-ray spectrometry performed in the scanning electron microscope (SEM) with energy dispersive x-ray spectrometry...

Measuring the Phase Transformation Kinetics Under Non-Equilibrium Conditions from Time Resolved High Resolution TEM Images

August 4, 2017

Author(s)

Renu Sharma, Zahra Hussaini, Pin A. Lin, Bharath NMN Natarajan

Microscopy (Big and Small) Data Analysis With the Open Source Software Package HyperSpy

August 3, 2017

Author(s)

Francisco de la Pena, Tomas Ostasevicius, Vidar T. Fauske, Pierre Burdet, Petras Jokubauskas, Magnus Nord, Mike Sarahan, Eric Prestat, Joshua Taillon, Jan Caron, Tom Furnival, Katharine E. MacArthur, Alberto Eljarrat, Stefano Mazzucco, Vadim Migunov, Thomas Aarholt, Michael Walls, Florian Winkler, Gael Donval, Ben Martineau, Andreas Garmannslund, Luiz-Fernando Zagonel, Ilya Iyengar

Analytical STEM-in-SEM: Towards Rigorous Quantitative Imaging

August 3, 2017

Author(s)

Jason Holm, Ryan White

This is a published conference abstract for Microscopy and Microanalysis, 2017.

On Mass-Thickness Contrast in STEM-in-SEM Images

August 3, 2017

Author(s)

Jason Holm, Ryan White

This is an extended abstract for Microscopy and Microanalysis, August 2017

Modeling Performance Measurement of Mobile Manipulators

August 3, 2017

Author(s)

Roger V. Bostelman, Sebti Foufou, Tsai H. Hong

Mobile manipulators are being marketed around the world as single manufacturer systems (i.e., robot arm and vehicle manufactured by the same organization) and...

Autonomous Relocation Strategies for Cells on Wheels in Environments with Prohibited Areas

July 31, 2017

Author(s)

Kamran Sayrafian, Ladan Rabieekenari, John Baras

Public safety organizations increasingly rely on wireless technology for their mission critical communication during disaster response operations. In such...

COMPUTATIONAL MODELING OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN PIPELINE STEELS

July 31, 2017

Author(s)

Andrew Slifka, Robert L. Amaro, Elizabeth S. Drexler, Devin T. O'Connor, Benjamin E. Long

In this work we further develop a model to predict hydrogen-assisted fatigue crack growth in steel pipelines and pressure vessels. This implementation of the...

Using DITA to Create Security Configuration Checklists

July 31, 2017

Author(s)

Joshua Lubell

Many software tools use security configuration checklists expressed in the Extensible Configuration Checklist Description Format (XCCDF) to monitor computers...

APPLICATION OF A MODEL OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN 4130 STEEL

July 31, 2017

Author(s)

Andrew Slifka, Robert L. Amaro, Devin T. O'Connor, Benjamin E. Long, Elizabeth S. Drexler

In this work, we applied a finite element model to predict the cyclic lifetime of 4130 steel cylinders under the influence of hydrogen. This example is used to...