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You searched on: Author: thomas siewert

Displaying records 21 to 30 of 74 records.
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21. 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 ...

22. 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 ...

Published: 11/16/2006
Authors: Krishna Verma Verma, Thomas Allen Siewert, F. Beckmann
Abstract: This paper highlights developments that led the FHWA¿s Office of Bridge Technology, working with State departments of transportation (DOT) and the concrete and steel bridge industries, to launch a major initiative to identify available technologies a ...

24. Effect of CVN Striker Radius on Absorbed Energy and Lateral Expansion for Various Stainless Steels
Published: 11/1/2006
Authors: Thomas Allen Siewert, Betsy Siewert, Raymond L Santoyo
Abstract: A number of wrought and cast stainless steel alloys were used to evaluate the effect of Charpy V-notch striker radius (2 mm vs 8 mm). Standard 10 mm by 10 mm (and 5 mm by 10 mm for N06022) specimens were machined from 5 grades of wrought material (30 ...

25. Evaluation Specimens for Izod Impact Machines (SRM 2115): Report of Analysis
Series: Special Publication (NIST SP)
Report Number: 260-164
Published: 10/1/2006
Authors: Thomas Allen Siewert, Jolene D Splett, Raymond L Santoyo
Abstract: In the past few years, we have received a number of requests for verification specimens for Izod impact machines, similar to what we offer for Charpy impact machines. Although there are similarities between Izod and Charpy impact testing, there are s ...

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 ...

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 ...

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 ...

29. Characterization of Submerged-Arc Welds From the World Trade Center Towers: As-Deposited Welds and Failures Associated With Impact Damage of the Exterior Columns
Published: 7/3/2006
Authors: Stephen W Banovic, Thomas Allen Siewert
Abstract: Intact and aircraft impact-damaged welds from the exterior columns of the World Trade Center towers were evaluated. The fillet welds joining the various steel plates composing the built-up columns were primarily deposited using submerged-arc welding ...

30. The development of procedures for impact testing
Published: 2/1/2006
Authors: Thomas Allen Siewert, Christopher N McCowan
Abstract: This report provides a broad overview of the progress in procedural improvements for impact testing. It includes a short summary of early developments, a discussion of topics that have been the subject of recent research, and a description of the imp ...

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