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You searched on: Author: elizabeth drexler

Displaying records 21 to 30 of 41 records.
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21. CTOA Measurements of Welds in X100 Pipeline Steel
Published: 10/3/2008
Authors: Elizabeth S Drexler, Philippe P. Darcis, Christopher N McCowan, John Matthew Treinen, Avigdor Shtechman, Roni Reuven, Thomas A. (Thomas A.) Siewert, Robert Smith, J. Merritt, Joseph David McColskey
Abstract: A suite of tests characterizing X100 pipeline steels was initiated at the National Institute of Standards and Technology (NIST) in Boulder. Part of the test matrix included testing the toughness of the base metal, welds, and heat-affected zones (HAZ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854069

22. CTOA Results for X65 and X100 Pipeline Steels:Influence of Displacement Rate
Published: 8/1/2008
Authors: Roni Reuven, Christopher N McCowan, Elizabeth S Drexler, Avigdor Shtechman, Philippe P. Darcis, John Matthew Treinen, R. Smith, J. Merritt, Thomas A. (Thomas A.) Siewert, Joseph David McColskey
Abstract: The toughness and plasticity of steel generally decreases with increasing testing rate. The crack tip opening angle (CTOA) was measured on two types of commercial pipeline steels, API-X65 and API-X100 at a range of displacement rates to characterize ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854079

23. Dynamic Apparatus for the CTOA Measurement in Pipeline Steels
Published: 8/1/2008
Authors: Avigdor Shtechman, Christopher N McCowan, Roni Reuven, Elizabeth S Drexler, Philippe P. Darcis, John Matthew Treinen, R. Smith, J. Merritt, Thomas A. (Thomas A.) Siewert, Joseph David McColskey
Abstract: When a crack initiates and propagates in a pressurized pipe the only thing that might stop this high-velocity event is the release of internal pressure (decompression) resulting in a deceleration in the crack-propagation rate. This deceleration can b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854082

24. Stiffening of the Extrapulmonary Arteries in Chronic Hypoxic Pulmonary Hypertension
Published: 7/1/2008
Authors: Elizabeth S Drexler, J. E. Bischoff, Christopher N McCowan, Andrew J Slifka, Timothy P Quinn, Robin Shandas, Dunbar Ivy, K. R. Stenmark
Abstract: It is increasingly appreciated that changes in the compliance properties of large blood vessels are critical determinants of ventricular afterload and ultimately dysfunction. Little is known of the mechanical properties of large vessels in the settin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50522

25. Interaction of environmental conditions: Role in the reliability of active implantable devices
Published: 6/7/2007
Authors: Elizabeth S Drexler, Andrew J Slifka, Nicholas Barbosa, John W. Drexler
Abstract: Present techniques for assessing the reliability of active implantable medical devices (AIMDs) rely on testing one or two environmental conditions at a time. But the interaction of these environmental conditions may have a greater impact on reliabili ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50532

26. 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 A. (Thomas A.) 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50531

27. Stress-strain behavior of rat pulmonary arteries
Published: 1/1/2007
Authors: Elizabeth S Drexler, J Wright, Andrew J Slifka, Christopher N McCowan, Dunbar Ivy, Robin Shandas
Abstract: The stress-strain behavior of rat pulmonary arteries was studied using a bubble inflation technique. To obtain mechanical properties, an analytical method to evaluate the bubble test results was developed. A flat disk of rat pulmonary artery was cons ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50074

28. Report of Workshop on Measurement Methods for Evaluation of the Reliability of Active Implantable Medical Devices
Series: Special Publication (NIST SP)
Report Number: 1047
Published: 5/1/2006
Authors: Elizabeth S Drexler, W F Regnault, John A Tesk
Abstract: This report summarizes the activities of the Workshop on Measurement Methods for Evaluation of the Reliability of Active Implantable Medical Devices, held October 3 and 4, 2005 in Gaithersburg, MD. The two-day workshop brought together representative ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50311

29. Implementation and Application of a Microstructurally Based Orthotropic Hyperelastic Model of Pulmonary Artery Mechanics under Normotensive and Hypertensive Conditions
Published: 8/1/2005
Authors: Yang Zhang, Martin Dunn, Elizabeth S Drexler, Christopher N McCowan, Andrew J Slifka, Dunbar Ivy, Robin Shandas
Abstract: We implemented, validated, and applied a microstructurally based orthotropic hyperelastic constitutive model to simulate pulmonary artery mechanics under normotensive and hypoxic hypertensive conditions. The configuration of the model microstructure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=30006

30. Comparison of Strength Properties of Normotensive and Hypertensive Rat Pulmonary Arteries
Published: 10/1/2004
Authors: Elizabeth S Drexler, Christopher N McCowan, J Wright, Andrew J Slifka, Dunbar Ivy, Robin Shandas
Abstract: A series of tests were conducted to quantify the difference in the mechanical properties of normo-and hypertensive pulmonary arteries. A bubble-test design was emplpoyed to measure the biaxial properties of a segment of artery. The test results compa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851344



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