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You searched on: Author: christopher mccowan

Displaying records 21 to 30 of 64 records.
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21. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854069

22. Charpy Machine Verification: Limits and Uncertainty
Series: Special Publication (NIST SP)
Published: 9/1/2008
Authors: Jolene D Splett, Christopher N McCowan, Chih-Ming Wang
Abstract: The purpose of this document is to clarify some issues pertaining to uncertainty statements and the ASTM E 23 limits used in the Charpy machine verification program. We explain some of the distributional subtleties associated with uncertainty and ult ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50573

23. CTOA Results for X65 and X100 Pipeline Steels:Influence of Displacement Rate
Published: 8/1/2008
Authors: Roni Reuven, Christopher N McCowan, Elizabeth S Drexler, Avigdor Shtechman, Philippe P. Darcis, John Matthew Treinen, R. Smith, J. Merritt, Thomas A. (Thomas A.) Siewert, Joseph David McColskey
Abstract: The toughness and plasticity of steel generally decreases with increasing testing rate. The crack tip opening angle (CTOA) was measured on two types of commercial pipeline steels, API-X65 and API-X100 at a range of displacement rates to characterize ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854079

24. Dynamic Apparatus for the CTOA Measurement in Pipeline Steels
Published: 8/1/2008
Authors: Avigdor Shtechman, Christopher N McCowan, Roni Reuven, Elizabeth S Drexler, Philippe P. Darcis, John Matthew Treinen, R. Smith, J. Merritt, Thomas A. (Thomas A.) Siewert, Joseph David McColskey
Abstract: When a crack initiates and propagates in a pressurized pipe the only thing that might stop this high-velocity event is the release of internal pressure (decompression) resulting in a deceleration in the crack-propagation rate. This deceleration can b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854082

25. Stiffening of the Extrapulmonary Arteries in Chronic Hypoxic Pulmonary Hypertension
Published: 7/1/2008
Authors: Elizabeth S Drexler, J. E. Bischoff, Christopher N McCowan, Andrew J Slifka, Timothy P Quinn, Robin Shandas, Dunbar Ivy, K. R. Stenmark
Abstract: It is increasingly appreciated that changes in the compliance properties of large blood vessels are critical determinants of ventricular afterload and ultimately dysfunction. Little is known of the mechanical properties of large vessels in the settin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50522

26. Peer review report: Pipeline and hazardous materials safety administration, pipeline safety research and development program
Published: 5/14/2008
Authors: Richard Joel Fields, Louis E. Hayden, Thomas J. O'Grady, Joseph David McColskey, Joe C Bowles, T. R. Webb, Christopher N McCowan, Dennis W. Hinnah, Ronald W. Haupt, Thomas A. (Thomas A.) Siewert
Abstract: The purpose of this document is to report findings from the research peer reviews held March 27-29, 2007 for PHMSA's Pipeline Safety Research and Development Program. The findings and recommendations in this report derive from the scoring and comment ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50623

27. Dynamic Force Measurement: Instrumented Charpy Impact Testing
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6652
Published: 1/1/2008
Authors: Christopher N McCowan, Jolene D Splett, E. Lucon
Abstract: The maximum forces measured by the machines in this round robin are in good agreement. This general result shows that the static force calibration of instrumented strikers is quite robust, and that the various striker designs evaluated here performed ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50616

28. The role of metallurgy in the NIST investigation of the world trade center towers collapse
Published: 11/1/2007
Authors: Stephen W Banovic, Timothy J Foecke, William E Luecke, Joseph David McColskey, Christopher N McCowan, Thomas A. (Thomas A.) Siewert, Frank W Gayle
Abstract: On August 21, 2002, on the direction of the U.S. Congress, the National Institute of Standards and Technology (NIST) initiated an investigation into the collapse of the World Trade Center (WTC) towers. In support of the overall investigation goals, t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900980

29. Crack Tip Opening Angle Optical Measurement Methods in Five Pipeline Steels
Published: 10/16/2007
Authors: Philippe P. Darcis, Christopher N McCowan, H. Windhoff, Joseph David McColskey, Thomas A. (Thomas A.) Siewert
Abstract: Crack tip opening angle (CTOA) is becoming one of the more widely accepted properties for characterizing fully plastic fracture. In fact, it has been recognized as a measure of the resistance of a material to fracture in cases where there is a large ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50504

30. Crack tip opening angle measurement through a girth welded in an X100 steel pipeline section
Published: 10/2/2007
Authors: Philippe P. Darcis, Christopher N McCowan, Joseph David McColskey, Richard Joel Fields
Abstract: Crack tip opening angle (CTOA) is becoming one of the accepted methods for characterizing fully plastic fracture. It provides a measure of the resistance to fracture for a material in cases where there is a large degree of stable-tearing crack extens ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50617



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