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You searched on: Author: Joseph McColskey

Displaying records 1 to 10 of 56 records.
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1. Temperature-Dependent Material Modeling for Structural Steels: Formulation and Application
Series: Technical Note (NIST TN)
Report Number: 1907
Published: 4/15/2016
Authors: Mina Samir Seif, William E Luecke, Lisa Yong yae Choe, Joseph A Main, Joseph David McColskey, Chao Zhang, Jonathan M Weigand, John L Gross, Fahim Sadek
Abstract: This report presents the formulation and application of a newly developed temperature-dependent material model for structural steels. First it presents a model for computing the stress-strain behavior of structural steel for conditions appropriat ...

Published: 9/29/2014
Authors: Timothy S Weeks, Joseph David McColskey, Mark D. Richards, Yong-Yi Wang, Marie A Quintana
Abstract: The curved-wide plate (CWP) tests are frequently used for assessing the quality of pipeline girth welds. Despite a large number of CWP tests having been conducted at great expense over many decades, an industry consensus standard remains unavailable ...

3. Apparatus for Accelerating Measurements of Environmentally Assisted Fatigue Crack Growth at Low Frequency
Published: 3/4/2014
Authors: Elizabeth S Drexler, Joseph David McColskey, Marc Dvorak, Neha N. Rustagi, Damian S Lauria, Andrew J Slifka
Abstract: Testing the fatigue crack growth of materials at low frequencies has been a tug-of-war between the investment of time and starting at high values of the stress intensity factor. Running a test at a frequency less than 1 Hz can take weeks and if meani ...

4. The effect of Acetobacter sp. and a sulfate-reducing bacterial consortium from ethanol fuel environments on fatigue crack propagation in pipeline and storage tank steels
Published: 2/1/2014
Authors: Jeffrey W Sowards, Charles Hall Davis Williamson, Timothy S Weeks, Joseph David McColskey, John R Spear
Abstract: This study evaluated the effects of microbiologically influenced corrosion (MIC) on fatigue crack growth of candidate materials useful in expanding bioethanol usage including: a storage tank steel (ASTM A36) and two pipeline steels (API 5L X52 and X7 ...

Published: 10/22/2013
Authors: Andrew J Slifka, Elizabeth S Drexler, Nicholas Nanninga, Yaakov Levy, Joseph David McColskey, Robert L Amaro
Abstract: Fatigue crack growth tests were conducted on two pipeline steel alloys, API 5L X52 and X100. Baseline tests were conducted in air, and those results were compared with tests conducted in pressurized hydrogen gas. All tests were run at (load ratio) R ...

6. The Influence of Simulated Fuel-Grade Ethanol on Fatigue Crack Propagation in Pipeline and Storage Tank Steels
Published: 10/1/2013
Authors: Jeffrey W Sowards, Timothy S Weeks, Joseph David McColskey
Abstract: This study presents an evaluation of fatigue crack propagation in three steel materials (A36, X52, and X70) in a simulated fuel grade ethanol environment. A fracture mechanics testing approach was used to determine crack propagation rates as a funct ...

7. CTOA Testing of Pipeline Steels Using MDCB Specimens
Published: 9/1/2013
Authors: Robert L Amaro, Jeffrey W Sowards, Elizabeth S Drexler, Joseph David McColskey, Christopher N McCowan
Abstract: Crack tip opening angle (CTOA) is used to rank the relative resistance to crack extension of various pipeline steels. In general, the smaller the CTOA value, the lower the resistance to crack extension. It is unclear, however, whether CTOA is a mater ...

8. Performance Evaluation of High-Strength Steel Pipelines for High-Pressure Gaseous Hydrogen Transportation
Published: 4/1/2013
Authors: Andrew J Slifka, Elizabeth S Drexler, Robert L Amaro, Joseph David McColskey, Yaoshan Chen, Ming Liu, Yong-Yi Wang
Abstract: Pipeline steels suffer significant degradation of their mechanical properties in high-pressure gaseous hydrogen, including their fatigue cracking resistances to cyclic loading. Fatigue crack growth experiments were performed on X52 and X70 steels in ...

9. Compression-Fatigue, Elastic Modulus, and Thermal Contraction of Insulated Conduit Arrays of ITER CS Modules
Published: 1/9/2013
Authors: Timothy S Weeks, Joseph David McColskey, Richard Reed, Robert Walsh, N. Martovetsky
Abstract: Abstract- Compression-fatigue tests at 76 K were conducted to compare two insulation systems (epoxy resin impregnated glass/Kapton) for use in the ITER Central Solenoid modules. Test samples consisted of insulated conduits that were stacked in 4 x 4 ...

10. Fatigue Flaw NDE Reference Standard Development - Phase I Feasibility Study
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7902
Published: 11/1/2012
Authors: Mark D. Richards, Joseph David McColskey, Timothy S Weeks
Abstract: A feasibility study was performed to evaluate a novel method of accurately fatigue cracking steel plates to generate fatigue proposed fatigue crack reference standards. Fatigue cracks were introduced into low carbon steel reference plates in whi ...

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