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Search Publications by: Mark A. Iadicola (Fed)

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Displaying 26 - 50 of 50

Constitutive Modeling based on Evolutionary Multi-junctions of Dislocations

May 7, 2014
Minh-Son Pham, Adam A. Creuziger, Mark A. Iadicola, Timothy J. Foecke, A.D. Rollett
A latent hardening model based on the binary junction-induced hardening can effectively describe the plastic anisotropic response. However, this approach still has some descriptive and predictive limitations. Recent findings show that binary junctions

Advanced Biaxial Cruciform Testing at the NIST Center for Automotive Lightweighting

January 1, 2014
Mark A. Iadicola, Adam A. Creuziger, Timothy J. Foecke
Modeling of sheet metal forming operations requires mechanical properties data at very large tensile strains and various biaxial strain paths. Typically these data are developed along strain ratio paths that are linear and monotonic, but actual forming

A Model for Calculating Diffraction Elastic Constants

January 18, 2012
Thomas H. Gnaeupel-Herold, Adam A. Creuziger, Mark A. Iadicola
An alternate model is proposed to calculate the diffraction elastic constants from the elastic constants of the single crystal. It is based on the inverse elastic susceptibility and thus it is related to the elastic polarization approach widely known as

5754 Aluminum Sheet Deformed Along Bi-Linear Strain Paths

September 29, 2011
Mark A. Iadicola, Lin Hu, Anthony D. Rollett, Timothy J. Foecke
Sheet specimens of aluminum alloy 5754 were deformed along a series of bi-linear, equal-biaxial and uniaxial, strain paths while simultaneously measuring stress-strain behavior. Using the measured crystallographic texture before and after deformation, the

Validation of Uniaxial Data Beyond Uniform Elongation

August 29, 2011
Mark A. Iadicola
Uniaxial testing is one of the simplest methods used to determining mechanical properties for sheet metals, but the classic test does not determine properties to sufficiently high strain levels for use in models of very large deformations such as forming

Analytical and Experimental Assessment of Steel Truss Bridge Gusset Plate Connections

June 8, 2011
Mark A. Iadicola, Yavuz Mentes, Yoon D. Kim, Robert S. Zobel, Donald W. White, Roberto T. Leon, Justin M. Ocel
This paper focuses on findings from comprehensive studies of steel truss bridge gusset plate behavior and proposes practical design procedures. The studies include comparisons of analytical models to responses from large-scale experimental tests from

Workshop on Quantitative Tools for Condition Assessment of Aging Infrastructure

October 14, 2010
Ward L. Johnson, Thomas A. Siewert, Jessica Terry, Dat Duthinh, Mark Iadicola, William E. Luecke, Joseph D. McColskey
The Quantitative Tools for Condition Assessment of Aging Infrastructure Workshop was held May 4-5, 2010, in Boulder, Colorado. It was organized by a team of researchers within the National Institute of Standards and Technology s (NIST) Materials Science

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

Experimental Procedures and Results for Benchmark 3: Stage 2 Forming Process

October 16, 2008
Mark Iadicola, Timothy J. Foecke, T B. Stoughton
The Numisheet 2005 Benchmark #3 consists of a two stage forming process performed on four materials (three steels and one aluminum). Stage 1 consists of forming channel sections in a channel draw die with variable penetration draw beads, and is described