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You searched on: Author: andrew slifka

Displaying records 11 to 20 of 47 records.
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11. 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

12. 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 ...

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. ...

14. 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 ...

15. Optical Trapping in Air of an Individual Nanotube-Sphere Device
Published: 8/10/2012
Authors: Andrew J Slifka, Gurpreet Singh, Paul Rice, Damian S Lauria, Roop Mahajan
Abstract: We demonstrate the optical manipulation of a polystyrene bead in air attached to an individual carbon nanotube. In continuation of our previous work [1] we have also utilized this technique to demonstrate the calibration of a nanotube-sphere (NT-sphe ...

16. 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 ...

17. A review of fatigue crack growth for pipeline steels exposed to hydrogen
Published: 11/30/2010
Authors: Nicholas Nanninga, Andrew J Slifka, Yaakov Levy, Calvin L. White
Abstract: Hydrogen pipeline systems offer an economical means of storing and transporting energy in the form of hydrogen gas. Pipelines can be used to transport hydrogen that has been generated at solar and wind farms to and from salt cavern storage locations ...

18. Electrochemical measurement of diffusion in photopolymerized polyethylene glycol (PEG) hydrogels
Published: 10/29/2010
Authors: Kavita M Jeerage, Stephanie M. LaNasa, Holly A. Hughes, Damian S Lauria, Stephanie J. Bryant, Andrew J Slifka
Abstract: Scanning electrochemical microscopy has been used to examine the molecular transport properties of photopolymerized poly(ethylene glycol) (PEG) hydrogels having different mesh sizes. Both the molecular weight (508 Da or 3000 Da) of the PEG diacrylate ...

19. Multi-Scale Pore Morphology in Vapor-Deposited Yttria-Stabilized Zirconia Coatings
Published: 6/16/2010
Authors: Derek D. Hass, H. Zhao, Tabbetha A. Dobbins, Andrew John Allen, Andrew J Slifka, H. N.G. Wadley
Abstract: A high pressure, electron-beam directed-vapor deposition process has been used to deposit partially stabilized zirconia containing 7 % yttria by mass at deposition pressures of 7.5 Pa to 23 Pa. Anisotropic ultra-small-angle X-ray scattering (USAXS) w ...

20. Observations of Nanobubble Formation on Carbon Nanotubes
Published: 5/28/2010
Authors: Andrew J Slifka, Damian S Lauria, Gurpreet Singh, Roop L Mahajan
Abstract: We used an optical trap and a high-speed camera to image bubble initiation on the surface of multi-walled carbon nanotubes. The laser wavelength was 1064 nm and the average power was 100 mW. This is the first demonstration of bubble formation on in ...

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