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Publications

Search Publications by William E. Luecke

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Displaying 26 - 50 of 50

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

September 1, 2005
Author(s)
William E. Luecke, Thomas A. Siewert, Frank W. Gayle
This report reviews the contemporaneous (1960s era) steel and welding standards used to construct the 110-story World Trade Center (WTC) towers. It describes the major structural elements in the towers and the many grades of steels relevant to the WTC

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

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

September 1, 2005
Author(s)
Stephen W. Banovic, Christopher N. McCowan, William E. Luecke
This report describes the physical properties of the structural steel recovered from the World Trade Center (WTC) towers. Analytical techniques were used to determine and evaluate the chemistry, microstructure, and thermal properties of the steels. While

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

Influence of Grain Size on the Tensile Creep Behavior of Ytterbium-Containing Silicon Nitride

March 1, 2004
Author(s)
Sheldon M. Wiederhorn, A R D Lopez, William E. Luecke, Michael J. Hoffmann, B Hockey, J French, D C. Yoon
The effect of grain size on the tensile creep of silicon nitride is investigated on two materials, one containing 5 % by volume Yb2O3, the other containing 5 % by volume Yb203 and 0.5 % by mass Al2O3. Annealing of the alumina-free silicon nitride increased

Creep of Lanthanum Gallate

March 1, 2002
Author(s)
William E. Luecke, T R. Armstrong
Strontium- and magnesium-doped lanthanum gallate (LSGM) was deliberately prepared to give A-site deficient non-stoichiometry with compositions (La0.9Sr0.1)z(Ga0.8Mg0.2)O3-delta (z =1.0,0.98, and 0.95). Creep tests in four-point 950 C 75 Mpa in air

Standards for Reliability Testing of Heavy Vehicle

October 1, 2001
Author(s)
S Jahanmir, James F. Kelly, William E. Luecke
The objective of this project is to develop international standard test methods for assessing the reliability of ceramic components used in diesel engines and other heavy vehicle propulsion systems. Advanced ceramics such as silicon nitrides offer unique

Standards for Reliability Testing of Heavy Vehicle Propulsion Materials

January 1, 2001
Author(s)
S Jahanmir, James F. Kelly, William E. Luecke
The objective of this project is to develop international standard test methods for assessing the reliability of ceramic components used in diesel engines and other heavy vehicle propulsion systems. Advanced ceramics such as silicon nitride offer a unique

Comparison of Tensile and Compressive Creep Behavior in Silicon Nitride

January 1, 2000
Author(s)
K J. Yoon, Sheldon M. Wiederhorn, William E. Luecke
The creep behavior of most commercial grade of Si3N4 was studied at 1350 and 1400 C. Stresses ranged from 10 to 200 Mpa in tension and from 30 to 300 Mpa in compression. In tension, the creep rate increased linearly with stress at low stresses and

High-Temperature Properties of Liquid-Phase-Sintered A-Sic

November 1, 1999
Author(s)
R P. Jensen, William E. Luecke, N P. Padture, Sheldon M. Wiederhorn
We have characterized the high-temperature subcritical crack growth and oxidation resistance of a liquid-phase-sintered (LPS) SiC with 20% volume fraction yttrium aluminum garnet (YAG) second phase. Constant stress rate testing in air in the temperature

A new model for tensile creep of silicon nitride

October 1, 1999
Author(s)
William E. Luecke, Sheldon M. Wiederhorn
The tensile creep rate of most commercial grades of Si3N4 increases strongly with stress. Although the usual power-law functions can represent the creep data, the data often show curvature and systematic variations of slope with temperature and stress. In

Tensile Creep and Rupture of Silicon Nitride

May 1, 1999
Author(s)
Ralph Krause, William E. Luecke, J French, B Hockey, Sheldon M. Wiederhorn
We have characterized the tensile creep, rupture lifetime, and cavitation behavior of a commercial, gas-pressure-sintered silicon nitride in the temperature range 1150 to 1400 C and stress range 70 to 400 MPa. Individual creep curves generally show primary

A Strain-Based Methodology for High Temperature Lifetime Prediction

September 1, 1998
Author(s)
Sheldon M. Wiederhorn, William E. Luecke, Ralph Krause
In structural materials, lifetime is often strain-determined. Once a part exceeds its allowable strain, its functional integrity is lost. Although most ceramics are designed to a brittle failure criterion, silicon nitride at the temperatures expected in

Interlaboratory verification of silicon nitride tensile creep properties

April 1, 1997
Author(s)
William E. Luecke, Sheldon M. Wiederhorn
Five laboratories tested NIST-supplied, pin-loaded, 76-mm-long tensile creep specimens at 1400 degrees C under a 150 MPa load using flag-based, laser extensometry, The laboratories reported failure time and strain and supplied the individual creep curves

Sources of Strain-Measurement Error in Flag-Based Extensometry

June 1, 1996
Author(s)
William E. Luecke, J French
This paper examines the sources of error in strain measurement using flag-based extensometry that uses either scanning laser or electrooptical extensometers, These errors fall into two groups: errors in measuring the true gauge length of the specimen

CAVITATION CONTRIBUTES SUBSTANTIALLY TO TENSILE CREEP IN SILICON NITRIDE

August 1, 1995
Author(s)
William E. Luecke, Sheldon M. Wiederhorn, B Hockey, Ralph Krause, Gabrielle G. Long
During tensile creep of a hot isostatically pressed (HIPed) silicon nitride, the volume fraction of cavities increases linearly with strain; these cavities produce nearly all of the measured strain. In contrast, compressive creep in the same stress and

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

Author(s)
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

Viscous Flow Creep in Ceramics Containing Secondary Crystalline Phases

Author(s)
Q Jin, D S. Wilkinson, G C. Weatherly, William E. Luecke, Sheldon M. Wiederhorn
Experimental observations of the creep response of a Y203-fluxed Si3N4 containing secondary crystalline phases(SP)are presented.The widths of grain-boundary amorphous films before and after creep have been characterized by using transmission electron