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Author: christopher mccowan

Displaying records 21 to 30 of 55 records.
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21. 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

22. NIST Recommended Practice Guide: Computing Uncertainty for Charpy Impact Machine Test Results
Series: Special Publication (NIST SP)
Published: 9/1/2007
Authors: Jolene D Splett, Christopher N McCowan, Hariharan K. (Hariharan K.) Iyer, Chih-Ming Wang
Abstract: The purpose of this recommended practice guide is to demonstrate how to determine the uncertainty associated with mean absorbed energy of specimens tested on a Charpy impact machine. We assume that the Charpy machine has successfully met the requirem ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150515

23. Measurement of Weld Toughness - Crack Tip Opening Angle Criterion
Published: 6/1/2007
Authors: Philippe P. Darcis, Joseph David McColskey, Christopher N McCowan, Thomas Allen Siewert
Abstract: The stable tearing behavior of X100 pipeline steel through a girth weld section was investigated using a modified double cantilever beam specimens. A test technique for direct measurement of the steady state crack tip opening angle (CTOA) criterion w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50527

24. Fracture Toughness through a Welded Pipeline Section - Crack Tip Opening Angle Criterion
Published: 4/23/2007
Authors: Philippe P. Darcis, Christopher N McCowan, Elizabeth S Drexler, Joseph David McColskey, Avigdor Shtechman, Thomas Allen Siewert
Abstract: The increasing demand for natural gas as an alternative energy source implies continued growth of gas pipeline installations. This trend compels the natural gas transmission industry to consider the construction of larger-diameter, higher-pressure pi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50531

25. Stress-strain behavior of rat pulmonary arteries
Published: 1/1/2007
Authors: Elizabeth S Drexler, J Wright, Andrew J Slifka, Christopher N McCowan, Dunbar Ivy, Robin Shandas
Abstract: The stress-strain behavior of rat pulmonary arteries was studied using a bubble inflation technique. To obtain mechanical properties, an analytical method to evaluate the bubble test results was developed. A flat disk of rat pulmonary artery was cons ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50074

26. Crack Tip Opening Angle: Measurement and Modeling of Fracture Resistance in Low and High Strength Pipeline Steels
Published: 9/1/2006
Authors: Philippe P. Darcis, Joseph David McColskey, Christopher N McCowan, Thomas Allen Siewert, Gabriel Kohn, Arry Bussiba, Richard Joel Fields
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=50312

27. Fatigue Crack Growth Rates in Five Pipeline Steels
Published: 9/1/2006
Authors: Arry Bussiba, Philippe P. Darcis, J D McCloskey, Christopher N McCowan, Thomas Allen Siewert, Gabriel Kohn, R P Smith, J. Merritt
Abstract: This study presents fatigue data for six different pipeline steels, with strengths ranging from Grade B to X100. A fatigue crack growth test for full-thickness pipeline samples was developed using a Middle Tension (MT) type specimen. The six steels s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50360

28. Second Symposium on Pendulum Impact Machines: Procedures and Specimens
Published: 8/1/2006
Authors: Thomas Allen Siewert, Christopher N McCowan, M. P. Manahan
Abstract: This publication consists primarily of the papers presented at the Second Symposium on Pendulum Impact Machines: Procedures and Specimens, sponsored by ASTM Committee E28 on Mechanical Testing and its Subcommittee E28.07 on Impact Testing. The Sympos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50248

29. International Comparison of Impact Reference Materials (2004)
Published: 4/3/2006
Authors: Christopher N McCowan, G. Roebben, Y. Yamaguchi, S. Lefrancois, Jolene D Splett, S. Takagi, A. Lamberty
Abstract: A three-year horizontal comparison has been completed between national laboratories that certify specimens for the indirect verification of Charpy impact test machines. The participants in this study were the Institute for Reference Materials and Mea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=30057

30. Analysis of Charpy impact verification data: 1993-2003
Published: 3/1/2006
Authors: Jolene D Splett, Christopher N McCowan
Abstract: Indirect verification tests, used to verify the performance of Charpy impact machines according to ASTM Standard E23, are evaluated by the National Institute of Standards and Technology (NIST) and the data from these tests are co1lected in a database ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=30024



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