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You searched on: Author: elizabeth drexler

Displaying records 11 to 20 of 46 records.
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11. THE EFFECT OF MICROSTRUCTURE ON THE HYDROGEN-ASSISTED FATIGUE OF PIPELINE STEELS
Published: 7/14/2013
Authors: Andrew J Slifka, Elizabeth S Drexler, Robert L Amaro, Damian S Lauria, April Stevenson, Douglas G Stalheim, Louis E Hayden
Abstract: Tests on the fatigue crack growth rate were conducted on four pipeline steels, two of grade API 5L- X52 and two API 5L-X70. One X52 material was from the mid 1960s and the other was manufactured in 2011. The two X70 materials had a similar vintage ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913640

12. Materials testing in hydrogen gas at NIST, Boulder
Published: 4/9/2013
Authors: Andrew J Slifka, Elizabeth S Drexler, Robert L Amaro, Damian S Lauria, James R Fekete, Katherine Rose Eason
Abstract: N/A
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913983

13. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914096

14. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911051

15. FATIGUE CRACK GROWTH OF TWO X52 PIPELINE STEELS IN A PRESSURIZED HYDROGEN ENVIRONMENT
Published: 9/9/2012
Authors: Andrew J Slifka, Elizabeth S Drexler, Neha N. Rustagi, Damian S Lauria, Joseph David McColskey, Robert L Amaro
Abstract: Fatigue crack growth tests were conducted on two API 5L X52 pipeline steel alloys. One alloy was from a new linepipe that was installed for hydrogen service in 2011. The other alloy was from a vintage pipe that first saw natural gas service in 1964. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912116

16. Fatigue Crack Growth of Pipeline Steels in Gaseous Hydrogen- Predictive Model Calibrated to API-5L X52
Published: 9/9/2012
Authors: Robert L Amaro, Elizabeth S Drexler, Neha N. Rustagi, Nicholas Nanninga, Yaakov Levy, Andrew J Slifka
Abstract: A phenomenological fatigue crack growth (FCG) model has been proposed to predict the FCG of API-5L X100 steel in high-pressure gaseous hydrogen [1]. The model presumes that total FCG is a summation of a ,pureŠ fatigue component and a hydrogen-assist ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912107

17. Interpretation and significance of reverse chevron-shaped markings on fracture surfaces of API X100 pipeline steels
Published: 8/15/2012
Authors: Christopher N McCowan, Elizabeth S Drexler, Jeffrey W Sowards
Abstract: Fracture surfaces of X100 pipeline steels were examined with optical and electron microscopy following fracture testing. The fractures show chevron-like fracture patterns, but are distinctly different from classic chevron fracture. The chevron-li ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906847

18. Comparison of hydrogen embrittlement in three pipeline steels in high pressure gaseous hydrogen environments
Published: 2/15/2012
Authors: Nicholas Nanninga, Yaakov Levy, Elizabeth S Drexler, Ryan Condon, April Stevenson, Andrew J Slifka
Abstract: The tensile properties of API-5L grades X52, X65, and X100 pipeline steels have been measured in a high pressure (13.8 MPa) hydrogen gas environment. Significant losses in elongation to failure and reduction in area were observed when testing in hyd ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907912

19. Ductile-Fracture Resistance in X100 Pipeline Welds Measured with CTOA
Published: 12/1/2011
Authors: Elizabeth S Drexler, Philippe P. Darcis, Christopher N McCowan, Jeffrey W Sowards, Joseph David McColskey, Thomas A. (Thomas A.) Siewert
Abstract: A test for evaluation of resistance to ductile fracture (crack tip opening angle, CTOA) was found to reveal changes in crack propagation through the strain and strength gradients near weld joints in X100 pipeline steels. This test provides a long lig ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906702

20. AGING-INDUCED ANISOTROPY OF MECHANICAL PROPERTIES IN STEEL PRODUCTS: IMPLICATIONS FOR THE MEASUREMENT OF ENGINEERING PROPERTIES
Published: 9/16/2011
Authors: Mark D. Richards, Elizabeth S Drexler, James R Fekete
Abstract: Strain aging in low-carbon steels is a well-known strengthening phenomenon, the typical results of which are an increase in yield stress and/or an increase in the extent of discontinuous yielding. Aging effects are generally characterized through th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907405



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