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1. Ductile-Fracture Resistance in X100 Pipeline Welds Measured with CTOA
Published: 12/1/2011
Authors: Elizabeth S Drexler, Philippe P. Darcis, Christopher N McCowan, Jeffrey W Sowards, Joseph David McColskey, Thomas A. (Thomas A.) Siewert
Abstract: A test for evaluation of resistance to ductile fracture (crack tip opening angle, CTOA) was found to reveal changes in crack propagation through the strain and strength gradients near weld joints in X100 pipeline steels. This test provides a long lig ...

2. United States Capitol Dome:Characterization of Cast and Wrought Materials
Published: 1/2/2011
Authors: Christopher N McCowan, Thomas A. (Thomas A.) Siewert, David Olson, Joseph David McColskey
Abstract: Restoration of the cast iron dome at the United States Capitol is needed because moisture is leaking into interior areas of the building due to corrosion damage. Microstructure, composition, and tensile properties of cast and wrought samples from th ...

3. Workshop on Quantitative Tools for Condition Assessment of Aging Infrastructure
Series: NIST Interagency/Internal Report (NISTIR)
Published: 10/14/2010
Authors: Ward L Johnson, Thomas A. (Thomas A.) Siewert, Jessica Terry, Dat Duthinh, Mark A Iadicola, William E Luecke, Joseph David McColskey
Abstract: The Quantitative Tools for Condition Assessment of Aging Infrastructure Workshop was held May 4-5, 2010, in Boulder, Colorado. It was organized by a team of researchers within the National Institute of Standards and Technology s (NIST) Materials Scie ...

4. Peer Review Report 2010
Published: 9/22/2010
Authors: Thomas A. (Thomas A.) Siewert, Robert Smith, Theresa Bell, Joseph David McColskey, Richard Joel Fields
Abstract: The Pipeline and Hazardous Materials Safety Administration s Pipeline Safety Research and Development (R&D) Program held a structured peer review of active research projects in April 2010. The peer review panel consisted of twelve government and ind ...

5. Safety Considerations in Designing a Facility for Mechanical Property Measurements in High Pressure Gaseous Hydrogen Environments.
Published: 5/4/2010
Authors: Andrew J Slifka, Yaakov Levy, Nicholas Nanninga, Thomas A. (Thomas A.) Siewert, Joseph David McColskey
Abstract: N/A

6. Integration of the NIST and SURDAT databases on the theoretical and physical properties of lead-free solder alloys
Published: 4/13/2010
Authors: W. Gasior, Z. Moser, A. Debski, Thomas A. (Thomas A.) Siewert
Abstract: The electronic SURDAT database published in 2007 (available freely from the website is being integrated with the NIST database (available freely from to provide a single source for data ...

7. Crack tip opening angle: applications and developments in the pipeline industry
Published: 7/1/2009
Authors: Elizabeth S Drexler, Philippe Darcis, Richard Joel Fields, Joseph David McColskey, Christopher N McCowan, Roni Reuven, Thomas A. (Thomas A.) Siewert
Abstract: One of the most difficult safety problems associated with gas pipeline to be solved is the control of ductile fracture propagation. To address this issue, the crack tip opening angle (CTOA) criterion is becoming one of the more widely accepted proper ...

8. Hydrogen-Steel Compatibility Research at NIST-Boulder
Published: 3/30/2009
Author: Thomas A. (Thomas A.) Siewert
Abstract: The NIST Materials Reliability Division is outfitting a high pressure (100 MPa) hydrogen testing facility to collect mechanical and thermodynamic property data on various candidate structural materials, and is developing data on nondestructive sens ...

Published: 1/5/2009
Authors: Angelique N Lasseigne, Kamalu Koenig, David Olson, Brajendra Mishra, Joshua Jackson, Thomas A. (Thomas A.) Siewert, Joseph David McColskey
Abstract: New higher strength pipeline steels (X100 and X120) exhibit lower tolerance for hydrogen (diffusible and formed hydrides) before significant degradation or failure occurs. It is essential to have advanced sensors to monitor the hydrogen content and ...

10. CTOA Measurements of Welds in X100 Pipeline Steel
Published: 10/3/2008
Authors: Elizabeth S Drexler, Philippe P. Darcis, Christopher N McCowan, John Matthew Treinen, Avigdor Shtechman, Roni Reuven, Thomas A. (Thomas A.) Siewert, Robert Smith, J. Merritt, Joseph David McColskey
Abstract: A suite of tests characterizing X100 pipeline steels was initiated at the National Institute of Standards and Technology (NIST) in Boulder. Part of the test matrix included testing the toughness of the base metal, welds, and heat-affected zones (HAZ ...

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