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1. Impact Characterization of 4340 and T200 Steels by Means of Standard, Sub Size and Miniaturized Charpy Specimens
Series: Technical Note (NIST TN)
Report Number: 1858
Published: 2/10/2015
Authors: Enrico Lucon, Christopher N McCowan, Raymond L Santoyo
Abstract: In this investigation, we performed instrumented Charpy tests in order to characterize the impact properties of three steels, used by NIST for the production of Charpy reference specimens (4340 quenched and tempered with two energy levels, and T2 ...

2. Impact Characterization of Line Pipe Steels by Means of Standard, Sub-Size and Miniaturized Charpy Specimens
Series: Technical Note (NIST TN)
Report Number: 1865
Published: 2/10/2015
Authors: Enrico Lucon, Christopher N McCowan, Raymond L Santoyo
Abstract: Modern line pipe steels are characterized by a continuously increasing ratio between ductility and mechanical strength, which makes it difficult to interpret the results of conventional Charpy impact tests. For such tests, the extremely high abso ...

3. Modeling flat to slant fracture transition in CTOA specimens using the computational cell methodology
Published: 2/23/2013
Authors: Christopher N McCowan, Jacques Besson, Elizabeth S Drexler
Abstract: Macroscopicmode I ductile crack propagation in thin metallic sheets often starts in mode I as a flat triangle whose normal corresponds to the loading direction. After some limited extension, the crack becomes slanted and propagates under local mixed ...

4. Fracture of X100 Pipeline Steel: Combined Experimental-Numerical Process
Published: 8/26/2011
Authors: Mordechai Szanto, Christopher N McCowan, Elizabeth S Drexler, Joseph David McColskey
Abstract: Accurate characterization of material fracture properties is necessary for reliable numerical prediction of rupture in gas pipelines. In the current work the ductile fracture properties for high strength X100 pipeline steel, was evaluated, using expe ...

5. Evaluation of Bias for Two Charpy Impact Machines Using the Same Instrumented Striker
Published: 5/1/2011
Authors: Christopher N McCowan, Enrico Lucon, Raymond L Santoyo
Abstract: Two Charpy machines were used to test NIST verification specimens at three energy levels: low energy (≈ 15 J at -40°C), high energy (≈ 100 J at -40°C) and super-high energy (≈ 240 J at room temperature). The study evaluates the diff ...

6. United States Capitol Dome:Characterization of Cast and Wrought Materials
Published: 1/2/2011
Authors: Christopher N McCowan, Thomas Allen 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 ...

Published: 9/27/2010
Authors: Christopher N McCowan, S. Xu, W. R. Tyson, R. Eagleson, Elizabeth S Drexler, J. David McColskey, Philippe P. Darcis
Abstract: Two types of specimen for crack tip opening angle (CTOA)measurement have been investigated for pipeline applications,i.e., the modified double cantilever beam (MDCB) (at NIST)and the drop-weight tear test (DWTT) specimen (at CANMET). Results of effe ...

8. Measuring Up to Sustainable Water, NIST-Virginia Tech Workshop on Aging Water Infrastructure September 9-10 2010
Series: Special Publication (NIST SP)
Published: 9/9/2010
Authors: Stephanie A Hooker, Christopher N McCowan, Sunil K. Sinha, Mark Edwards
Abstract: The NIST-VT workshop identified funding priorities for federal institutions and other funding sources for sustainable water infrastructure systems in order to align fundamental and applied research with long-term needs. The workshop started with seve ...

9. Certification Report for SRM 2112 and 2113
Series: Special Publication (NIST SP)
Report Number: 260-178
Published: 7/1/2009
Author: Christopher N McCowan
Abstract: This report documents the procedures used to develop certified maximum force and absorbed energy values for SRM 2112 and SRM 2113. The report serves to provide outside observers with accurate and detailed information on how the materials were ce ...

10. 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 Allen 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 ...

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