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Search Publications by: Stephen W. Banovic (Fed)

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Displaying 1 - 25 of 45

Dynamic Flow Stress Measurements for Machining Applications

December 19, 2014
Steven P. Mates, Eran Vax, Richard Rhorer, Michael B. Kennedy, Eric P. Whitenton, Stephen W. Banovic, Timothy J. Burns
Metals undergo a combination of rapid loading and rapid heating during normal and high speed machining processes. Constitutive models for these materials, however, generally lack any information regarding kinetics of thermally-induced transformations, such

High-temperature tensile constitutive data and models for structural steels in fire

November 30, 2011
William E. Luecke, Stephen W. Banovic, Joseph D. McColskey
This report documents the stress-strain behavior of a collection of structural steels recovered from the collapse of the World Trade Center. These steels, combined with literature data form the basis of a model for the stress-strain behavior of structural

An electrical pulse-heated Kosky bar technique for high strain rate flow stress measurements of rapidly heated metals

September 13, 2009
Steven P. Mates, Stephen W. Banovic, Richard L. Rhorer, Timothy J. Burns, Eric P. Whitenton, D Basak
We have developed a unique electrical pulse-heated Kolsky Bar technique for measuring the flow stress of metals at heating rates of up to 6000 °C per second and strain rates up to 10^4 per second. Under these conditions, which are approaching those found

Analysis of Structural Steel in the World Trade Center Investigation

October 16, 2008
Frank W. Gayle, Richard J. Fields, Stephen W. Banovic
In March 2002 NIST became the lead agency in an investigation of the World Trade Center collapse. The investigation addresses many aspects of the catastrophe, from occupant egress to factors affecting how long the Twin Towers stood after being hit by the

Experimental Observations of Evolving Yield Loci in Biaxially Strained AA 5754-O

October 16, 2008
Mark Iadicola, Timothy J. Foecke, Stephen W. Banovic
Experimental measurement of the plastic biaxial mechanical response for an aluminum alloy (AA 5754-O) sheet metal is presented. Traditional methods of multiaxial sheet metal testing require the use of finite element analysis (FEA) or other assumptions of

High-Temperature, Tensile, Constitutive Data for World Trade Center Steels

October 16, 2008
William E. Luecke, Stephen W. Banovic, Joseph D. McColskey
This paper reports high-temperature tensile constitutive data for nine steels recovered from the fire and impact floors of the World Trade Center. Microstructurally, the nine steels represent typical structural steels from the 1970s. It reports the true

High Rate Tensile Strength Measurements of Frangible Bullets Using a Kolsky Bar

June 8, 2008
Steven P. Mates, Richard L. Rhorer, Stephen W. Banovic, Eric P. Whitenton, Richard J. Fields
The tensile strength of frangible bullets is measured by a high rate diametral compression test (DCT) performed with a Kolsky Bar. Frangible bullets, meant to disintegrate on impact by brittle failure, also exhibit significant plasticity in compression. As

The role of metallurgy in the NIST investigation of the world trade center towers collapse

November 1, 2007
Stephen W. Banovic, Timothy J. Foecke, William E. Luecke, Joseph D. McColskey, Christopher N. McCowan, Thomas A. Siewert, Frank W. Gayle
On August 21, 2002, on the direction of the U.S. Congress, the National Institute of Standards and Technology (NIST) initiated an investigation into the collapse of the World Trade Center (WTC) towers. In support of the overall investigation goals, the

Tensile Strength Measurements of Frangible Bullets Using the Diametral Compression Test

May 8, 2007
Steven P. Mates, Richard L. Rhorer, Stephen W. Banovic, Eric P. Whitenton, Richard J. Fields
Frangible bullets are designed to disintegrate on impact against rigid surfaces to avoid ricochet hazards in recreational shooting ranges or law enforcement training facilities. Their behavior against protective soft body armor is therefore quite different

Damage and Failure Modes of Structural Steel Components (Appendices A-G). Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-3C) ***DRAFT for Public Comments***

September 1, 2005
Stephen W. Banovic, Timothy J. Foecke
This report describes damage characteristics, failure modes, and fire-related degradation of the recovered structural components from the World Trade Center (WTC) 1 and WTC 2. Assessment of the structural components was divided into pre- and post-collapse