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You searched on: Author: christopher mccowan

Displaying records 51 to 60 of 65 records.
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51. 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 ...

52. Constitutive Models for a Poly(e-caprolactone) Scaffold
Published: 10/1/2004
Authors: Timothy P Quinn, Tammy L. Oreskovic, Christopher N McCowan, N Washburn
Abstract: We investigate material models for a porous, polymeric scaffold used for bone. The material was made by co-extruding poly (e-caprolactone) (PCL), a biodegradable polyester, and poly(ethylene oxide)(PEO). The water soluble PEO was removed resulting in ...

53. The Structural Steel of the World Trade Center Towers
Published: 10/1/2004
Authors: Frank W Gayle, Stephen W Banovic, Timothy J Foecke, Richard Joel Fields, William E Luecke, Joseph David McColskey, Thomas A. (Thomas A.) Siewert, Christopher N McCowan
Abstract: In September 2002, the National Institute of Standards and Technology became the lead agency in an investigation of the World Trade Center (WTC) disaster of September 11, 2001. The investigation addresses many aspects of the catastrophe, from occupa ...

54. The NIST Charpy V-Notch Verification Program: Overview and Operating Procedures
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 1500-9
Published: 9/1/2003
Authors: Christopher N McCowan, Thomas A. (Thomas A.) Siewert, D P Vigliotti
Abstract: Charpy impact testing is often specified as ,in acceptance test for structural materials, and companies performing acceptance tests are typically required to verify the performance of their impact machine periodically. The procedure for verifying th ...

55. An Experimental Method for Measuring Mechanical Properties of Rat Pulmonary Arteries Verified With Latex
Series: Journal of Research (NIST JRES)
Published: 6/1/2003
Authors: Elizabeth S Drexler, Andrew J Slifka, J Wright, Christopher N McCowan, Dudley Finch, Timothy P Quinn, J D McCloskey, Dunbar Ivy, Robin Shandas
Abstract: A study of the biomechanics and hemodynamics of pulmonary hypertension is incomplete without including mechanical properties data comparing healthy and diseased arterial tissue. In the initial stabe of this study, Sprague-Dawley rats will be induced ...

56. Failure Analysis of the WWVB Tower
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6619
Published: 8/1/2002
Authors: Joseph David McColskey, Christopher N McCowan, Raymond L Santoyo
Abstract: A failure analysis was conducted on the collapse of the NIST WWVB tower. The analysis included mechanical testing, chemical analysis, and metallographic examination of the failed part. We ascertained that the underlying reason for the collapse was ...

57. Observations on Differences Between the Energy Determined Using an Instrumented Striker and Dial/Encoder Energy
Published: 6/1/2002
Authors: M P Manahan, R B Stonesifer, Thomas A. (Thomas A.) Siewert, Christopher N McCowan, D P Vigliotti
Abstract: Instrumented stricker systems and optical encoders are widely used for measurement of absorbed energy in both conventional and miniature Charpy tests. It has been observed that the total absorbed energy measured using these two technologies, while g ...

58. The History and Importance of Impact Testing
Published: 5/1/2002
Authors: Thomas A. (Thomas A.) Siewert, M P Manahan, Christopher N McCowan, J M Holt, F J Marsh
Abstract: Charpy impact testing is a low-cost and reliable test method which is commonly required by the construction codes for fracture-critical structures such as bridges and pressure vessels. yet, it took from about 1900 to 1960 for impact-test technology ...

59. NIST Recommended Practice Guide: Installing, Maintaining, and Verifying Your Charpy Impact Machine
Series: Special Publication (NIST SP)
Report Number: 960-4
Published: 10/1/2000
Authors: D P Vigliotti, Thomas A. (Thomas A.) Siewert, Christopher N McCowan
Abstract: The quality of the data developed by pendulum impact machines depends on how well the machines are installed, maintained, and verified. This is the reason that ASTM Standard E23 Standard Test Methods for Notched Bar Impact Testing of Metallic Materi ...

60. Maintaining the Accuracy of Charpy Impact Machines
Published: 5/1/2000
Authors: D P Vigliotti, Thomas A. (Thomas A.) Siewert, Christopher N McCowan
Abstract: The quality of the data developed by impact machines tends to degrade over time, due to the effects of weear and vibration that are inherent in the test. This is the reason that impact standards specify periodic direct and indirect verification test ...

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  • SP 250-XX: Calibration Services
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