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Search Publications by: Dave McColskey (Assoc)

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Displaying 51 - 63 of 63

Mechanical and Metallurgical Analysis of Structural Steel. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-3) ***DRAFT for Public Comments***

September 1, 2005
Author(s)
Frank W. Gayle, Richard J. Fields, William E. Luecke, Stephen W. Banovic, Timothy J. Foecke, Christopher N. McCowan, Joseph D. McColskey, Thomas A. Siewert
This report is an overview of the results of the mechanical and metallurgical analysis of structural steel from the World Trade Center (WTC), part of the National institute of Standards and Technology Investigation of the WTC disaster of September 11, 2001

Mechanical Properties of Structural Steels. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-3D) ***DRAFT for Public Comments***

September 1, 2005
Author(s)
William E. Luecke, Joseph D. McColskey, Christopher N. McCowan, Stephen W. Banovic, Richard J. Fields, Timothy J. Foecke, Thomas A. Siewert, Frank W. Gayle
This report provides five types of mechanical properties for steels from the World Trade Center (WTC): elastic, room-temperature tensile, room-temperature high strain rate, impact, and elevated-temperature tensile. Specimens of 29 different steels

FORENSIC STUDY OF THE STEEL IN THE WORLD TRADE CENTER

December 30, 2004
Author(s)
Thomas A. Siewert, Joseph D. McColskey, Christopher N. McCowan, Frank W. Gayle, William E. Luecke, Stephen W. Banovic, Timothy J. Foecke, Richard J. Fields
In September of 2002, the National Institute of Standards and Technology began a two-year investigation into the World Trade Center (WTC) disaster of September 11, 2001. Now almost complete, the investigation addresses many aspects of the catastrophe, from

The Structural Steel of the World Trade Center Towers

October 1, 2004
Author(s)
Frank W. Gayle, Stephen W. Banovic, Timothy J. Foecke, Richard J. Fields, William E. Luecke, Joseph D. McColskey, Thomas A. Siewert, Christopher N. McCowan
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 occupant

Mechanical Behavior of Contact Aluminum Alloy

January 1, 2003
Author(s)
David T. Read, Yi-Wen Cheng, Joseph D. McColskey, R R. Keller
Here we report the results of tensile tests of thin films of Al-0.5 % Cu deposited on bare silicon. This material was on a wafer that was subjected to the complete CMOS fabrication process, tensile strength, and elongation were all lower than the

Failure Analysis of the WWVB Tower

August 1, 2002
Author(s)
Joseph D. McColskey, Christopher N. McCowan, Raymond L. Santoyo
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 fatigue

Measurement of Residual Stress in Bent Pipelines

June 1, 2002
Author(s)
G A. Alers, Joseph D. McColskey
Buried gas and oil pipelines can be subjected to unexpected bending loads causedby such earth movements as earthquakes, wash-outs, road building, mining subsidence, etc.as well as by denting from unintentional digging. In order to make a fitness-for

Tensile Properties of Free-Standing Aluminum Thin Films

September 1, 2001
Author(s)
David T. Read, Yi-Wen Cheng, R R. Keller, Joseph D. McColskey
Tensile properties of electron-beam-deposited free-standing aluminum thin films were measured. High ς y and UTS were observed, mainly due to fine grain sizes, consistent with values reported in the literature. The observed Young's modulus, as measured by

Microstructural and Mechanical Characterization of Electrodeposited Gold Films

January 1, 2001
Author(s)
G J. Long, David T. Read, Joseph D. McColskey, K Crago
The effects of temperature and duration of thermal treatments on the microstructure and mechanical properties of electrodeposited gold films were evaluated. Specimens were synthesized by electrodeposition of gold on copper foil substrates followed by

Microwave Detection of Stress Induced Farigue Cracks in Steel and Potential of Crack Opening Determination Using a New Phase Sensitive Approach Based on a Waveguide Magic TEE

July 1, 2000
Author(s)
N Qaddoumi, E Ranu, R Zoughi, Joseph D. McColskey
Detection and evaluation of surface cracks in metals is an important facet of nondestructive testing and evaluation (NDT&E). Cracks in bridges, aircraft wings and other metal structures can pose serious danger to the structure and ultimately human lives

Detectability of Slow Crack Growth in Bridge Seels by Acoustic Emission

December 1, 1998
Author(s)
Marvin A. Hamstad, Joseph D. McColskey
The detectabillity of slow crack growth of cracks in bridge steels has been studied by use of acoustic emission testing technology. Fatigue crack-growth rates of nominally 1x10 -4 mm/cycle (4x10 -6 in./cycle) and 1x10 -3 mm/cycle (4x10-5 in/cycle) were