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Displaying 1 - 25 of 3753

High Pressure Release and Dispersion of Hydrogen in a Partially Enclosed Compartment

March 1, 2011
Author(s)
Kuldeep R. Prasad, Thomas G. Cleary, William M. Pitts, Jiann C. Yang
… The study of compressed hydrogen release from high-pressure storage systems has practical application for hydrogen and fuel cell technologies. Such releases may occur … connecting piping, or direct PRD releases. Understanding hydrogen behavior during and after the unintended release …

The Influence Of Hydrogen On The Elastic Modulus And Anelastic Response Of Cold Worked Pure Iron

July 1, 2009
Author(s)
Richard E. Ricker, David J. Pitchure
… Understanding the influence of hydrogen on elastic deformation and anelastic response should contribute to our understanding of the influence of hydrogen on deformation and fracture. To accomplish this … samples of pure iron were cold-worked, charged with hydrogen, and examined in a dynamic mechanical analyzer. For …

COMPUTATIONAL MODELING OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN PIPELINE STEELS

July 31, 2017
Author(s)
Andrew Slifka, Robert L. Amaro, Elizabeth S. Drexler, Devin T. O'Connor, Benjamin E. Long
… In this work we further develop a model to predict hydrogen-assisted fatigue crack growth in steel pipelines and … elastic-plastic constitutive model in conjunction with a hydrogen diffusion model to predict the deformation and concentration of hydrogen around a fatigue crack tip. The hydrogen …

APPLICATION OF A MODEL OF HYDROGEN-ASSISTED FATIGUE CRACK GROWTH IN 4130 STEEL

July 31, 2017
Author(s)
Andrew Slifka, Robert L. Amaro, Devin T. O'Connor, Benjamin E. Long, Elizabeth S. Drexler
… lifetime of 4130 steel cylinders under the influence of hydrogen. This example is used to demonstrate the efficacy of … to be robust and incorporate features of stress-assisted hydrogen diffusion, large-scale plasticity, hydrogen gas pressure, loading frequency, and effects of …

Fatigue Crack Growth of Pipeline Steels in Gaseous Hydrogen- Predictive Model Calibrated to API-5L X52

September 9, 2012
Author(s)
Robert L. Amaro, Elizabeth S. Drexler, Neha N. Rustagi, Nicholas Nanninga, Yaakov Levy, Andrew J. Slifka
… the FCG of API-5L X100 steel in high-pressure gaseous hydrogen [1]. The model presumes that total FCG is a summation of a “pure” fatigue component and a hydrogen-assisted (HA) component. The hydrogen-assisted fatigue component is further divided into … 2012 International Hydrogen Conference …

A Thermodynamic Analysis of Refilling of a Hydrogen Tank

August 31, 2009
Author(s)
Jiann C. Yang
… A thermodynamic analysis of refilling of a gaseous hydrogen fuel tank is described. This study may lend itself to the applications of refilling a hydrogen storage tank onboard a hydrogen fuel cell vehicle. The gaseous hydrogen is treated … International Journal of Hydrogen Energy …

Comparison of hydrogen embrittlement in three pipeline steels in high pressure gaseous hydrogen environments

February 15, 2012
Author(s)
Nicholas Nanninga, Yaakov Levy, Elizabeth S. Drexler, Ryan Condon, April Stevenson, Andrew J. Slifka
… steels have been measured in a high pressure (13.8 MPa) hydrogen gas environment. Significant losses in elongation to … and reduction in area were observed when testing in hydrogen as compared with air, and those changes were … by noticeable changes in fracture morphology. For hydrogen charged specimens, surface crack initiation and …

Tests of Theory in Rydberg States of One-electron Ions

July 1, 2014
Author(s)
Joseph N. Tan, Peter J. Mohr
… electrodynamics (QED) for Rydberg states of one-electron ions can test theory and allow new determinations of … of Standards and Technology (NIST), highly-charged ions (including bare nuclei)created in an Electron Beam Ion … trap. An ongoing experiment aims to produce one-electron ions isolated in an ion trap designed for laser spectroscopy. …

Vertical Release of Hydrogen in a Partially Enclosed Compartment : Role of Wind and Buoyancy

January 25, 2011
Author(s)
Kuldeep R. Prasad, William M. Pitts, Jiann C. Yang
… The natural and wind driven mixing and dispersion of hydrogen released in an accidental manner in a partially … to predict the entrainment of air in a buoyant turbulent hydrogen plume and the properties of the resulting two layer … the important physical processes involved during hydrogen release as a vertical plume, and dispersion in a …

TOWARDS A TEST METHOD FOR HYDROGEN SENSOR PERFORMANCE

April 2, 2008
Author(s)
Nathan D. Marsh, Thomas G. Cleary
… standard test methods for the performance of commercial hydrogen sensors, we employed the Fire Emulator / Detector … of a representative selection of commercially-available hydrogen sensors.  These sensors depend on a variety of …  They were evaluated both for their response to hydrogen concentrations up to half the lower flammability …

Effect of wind and buoyancy on hydrogen release and dispersion in a compartment with vents at multiple levels

November 30, 2010
Author(s)
Kuldeep R. Prasad, William M. Pitts, Jiann C. Yang
… The natural and forced mixing and dispersion of hydrogen released in an accidental manner in a partially … the important physical processes involved during hydrogen release and dispersion in a compartment with vents … parameters. Model results indicate that the steady state hydrogen volume fraction in the compartment is lower when the …

ON MATERIAL-BASED HYDROGEN STORAGE

August 1, 2008
Author(s)
Jiann C. Yang
… pressure in a would-be situation wherein a material-based hydrogen storage system is rendered closed.  Under several … International Journal of Hydrogen Energy … Hydrogen, Safety, Storage … ON MATERIAL-BASED HYDROGEN STORAGE …

The Potential of Highly Charged Ions: Possible Future Applications

September 1, 2007
Author(s)
John D. Gillaspy, Joshua M. Pomeroy, A C. Perrella, Holger Grube
… International Conference on the Physics of Highly Charged Ions. It briefly updates and extends an earlier review given … International Conference on the Physics Highly Charged Ions Proceedings … electron beam ion trap, euv lithography, highly charged ions, magnetic tunnel junctions, nanocrystals …

NATURAL AND FORCED VENTILATION OF BUOYANT GAS RELEASED IN A FULL-SCALE GARAGE: COMPARISON OF MODEL PREDICTIONS AND EXPERIMENTAL DATA

December 19, 2011
Author(s)
Kuldeep R. Prasad, William M. Pitts, Marco G. Fernandez, Jiann C. Yang
… Increase in the number of hydrogen fueled applications in the marketplace will require … and explosion associated with the unintended release of hydrogen within a structure. Predicting the temporally evolving hydrogen concentration in a structure, with unknown release …

FATIGUE CRACK GROWTH RATES OF API X70 PIPELINE STEELS IN PRESSURIZED HYDROGEN GAS COMPARED WITH AN X52 PIPELINE IN HYDROGEN SERVICE

September 1, 2017
Author(s)
Elizabeth S. Drexler, Andrew J. Slifka, Robert L. Amaro, Damian S. Lauria, Jeffrey W. Sowards
… At the present time, steel selection for hydrogen pipelines is limited to API X52 grade. However, the … pipeline steel that is currently in service transporting hydrogen gas, as well as two X70 pipeline steels. The compact tension specimens were tested in hydrogen gas pressurized to 5.5 MPa or 34 MPa. A comparison …

Analysis of Thermodynamic Processes Involving Hydrogen

March 5, 2008
Author(s)
Jiann C. Yang, Marcia L. Huber
… thermodynamic processes involving the storage and use of hydrogen has been examined using the NIST REFPROP database. … when the exposure temperature is very close to the hydrogen autoignition temperature. … International Journal of Hydrogen Energy … autoignition, hydrogen, Joule-Thomson effect, thermodynamics …

FATIGUE CRACK GROWTH OF TWO X52 PIPELINE STEELS IN A PRESSURIZED HYDROGEN ENVIRONMENT

September 9, 2012
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Neha N. Rustagi, Damian S. Lauria, Joseph D. McColskey, Robert L. Amaro
… One alloy was from a new linepipe that was installed for hydrogen service in 2011. The other alloy was from a vintage … results were compared with tests conducted in pressurized hydrogen gas. All tests were run at (load ratio) R = 0.5 and a frequency of 1 Hz. Tests were conducted at hydrogen pressures of 5.5 MPa and 34 MPa. A new method that …

First Measurement of Lyman Alpha X-ray Lines in Hydrogen-like Vanadium

September 30, 2009
Author(s)
John D. Gillaspy, C T. Chantler, D Paterson, Lawrence T. Hudson, F Serpa, E Takacs
… The first measurement of hydrogen-like vanadium x-ray Lyman alpha transitions has been … Hydrogen, Hydrogen-like ions, quantum electrodynamics (QED), Lamb … First Measurement of Lyman Alpha X-ray Lines in Hydrogen-like Vanadium …

Hydrogen induced amorphization of LaMgNi4 phase in metal hydride alloys

August 3, 2015
Author(s)
Leonid A. Bendersky, Haoting Shen, Kwo Young, Taihei Ouchi
… Hydrogen induced amorphization (HIA) of the LaMgNi4 phase at … is reversible after annealing at 250C for 1 h. The hydrogen storage capacity of the LaMgNi4 phase in an … International Journal of Hydrogen Energy … Hydrogen absorbing alloys, Hydrogen induced amorphization, …

Effects of hydrogen on the evolution of 4130 steel microstructure as a result of tensile loading

July 12, 2024
Author(s)
Zack Buck, May Ling Martin, Damian Lauria, Jason Killgore, Peter Bradley, Yan Chen, Ke An, Matthew Connolly
… that resulted from tensile loading in air and under three hydrogen pressures: 1.8 MPa, 9 MPa, and 18 MPa. … (BCT) phases as a function of applied strain and hydrogen pressure. A modified Williamson-Hall approach was … densities between in-air tests and those performed in hydrogen. However, lattice strain, particularly those …

Investigation of the fracture resistance of high strength ferritic steel welds in gaseous hydrogen environment

April 22, 2024
Author(s)
Paolo Bortot, Matteo Ortolani, Michele Sileo, Erick Escorza, Matthew Connolly, Zack Buck, Ashwini Chandra
… Hydrogen is expected to play a major role in the … and tempered ferritic steels are widely used for gaseous hydrogen storage despite the fact that hydrogen affects material properties and result in higher … International Journal of Hydrogen Energy … hydrogen gas, quenched and tempered ferritic steel, fracture …

Do Specific Ion Effects on Collective Relaxation Arise from Perturbation of Hydrogen-Bonding Network Structure?

June 24, 2024
Author(s)
Jennifer Clark, Jack F. Douglas
… arises from respective breakdown or enhancement of the hydrogen-bonding network structure. Recent quasi-elastic … were interpreted as confirming this proposed origin of ion effects on the dynamics of water. However, we find … of salts to water. A thorough understanding of specific ion effects should be useful in diverse material …

Zn-MOF Assisted Dehydrogenation of Ammonia Borane: Enhanced Kinetics and Clean Hydrogen Generation

February 1, 2012
Author(s)
Gadipelli Srinivas, Jamie Ford, Wei Zhou, Taner Yildirim
… We report controllable and enhanced hydrogen release kinetics at reduced temperatures in ammonia … via solution infiltration. The ABMOF system provides clean hydrogen by suppressing the release of detrimental volatile … These byproducts prevent the direct use of AB as a hydrogen source for polymer electrolyte membrane fuel cell …

Hydrogen storage in rapidly solidified and crystallized Mg-Ni-(Y,La)-Pd alloys

April 9, 2012
Author(s)
Eric Lass
… and used as precursors for creating nanocrystalline hydrogen storage materials. The resulting materials demonstrate relatively high hydrogen capacity of around 4.5 mass % H and excellent … at 573 K. Additionally, the alloys demonstrate reversible hydrogen storage at 473 K. A composition of Mg85Ni10Y2.5Pd2.5 …
Displaying 1 - 25 of 3753
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