Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Mark A. Iadicola (Fed)

Displaying 51 - 75 of 102

Uncertainties of Digital Image Correlation Due to Pattern Degradation at Large Strain

June 8, 2015

Author(s)

Mark A. Iadicola

A method to measure the displacement uncertainty increase, due in part to pattern breakdown at large strains is described. The method is similar to rigid body displacement methods used in prior work. Multiple pattern assessment metrics from the literature

Forming limit diagram predictions using a self-consistent crystal plasticity model: a parametric study

April 15, 2015

Author(s)

Youngung Jeong, Minh-Son Pham, Mark A. Iadicola, Adam A. Creuziger

A numerical model to predict forming limit diagram (FLD) for polycrystalline metal sheets is presented. In it, the Marciniak-Kuczynski (MK) approach is incorporated into the framework of the viscoplastic self-consistent (VPSC) crystal plasticity model. The

An Experimental and Numerical Study of Deformation Behavior of Steels in Biaxial Tensile Tests

March 9, 2015

Author(s)

Dilip K. Banerjee, Mark A. Iadicola, Adam A. Creuziger, Timothy J. Foecke

Measurement of Biaxial Stress Based on Elasto-Viscoplastic Self-Consistent Analysis of X-ray Diffraction

July 16, 2014

Author(s)

Youngung Jeong, Thomas H. Gnaupel-Herold, Frederic Barlat, Mark Iadicola, Adam Abel Creuziger, Myoung-Gyu Lee

Constitutive Modeling based on Evolutionary Multi-junctions of Dislocations

May 7, 2014

Author(s)

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

The Strain Path Dependence of Plastic Deformation Response of AA5754: Experiment and Modeling

January 6, 2014

Author(s)

Minh-Son Pham, Lin Hu, Mark A. Iadicola, Adam A. Creuziger, Anthony D. Rollett

This work presents modeling of experiments on a balanced biaxial (BB) pre-strained AA5754 alloy, subsequently reloaded uniaxially along the rolling direction and transverse direction. The material exhibits a complex plastic deformation response during the

Advanced Biaxial Cruciform Testing at the NIST Center for Automotive Lightweighting

January 1, 2014

Author(s)

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

Interpretation of Diffraction Data from In-situ Stress Measurements during Biaxial Sheet Metal Forming

September 1, 2013

Author(s)

Thomas H. Gnaupel-Herold, Mark A. Iadicola, Adam A. Creuziger, Timothy J. Foecke, Lin Hu

Biaxial yield behavior is determined in-situ through X-ray lattice strain measurements. The distributions of d-spacings in different sample directions is affected both by the changes in diffraction elastic constants (DEC) from evolving texture and by the

Crystal Plasticity Analysis of Constitutive Behavior of 5754 Aluminum Sheet Deformed Along Bi-Linear Strain Paths

December 1, 2012

Author(s)

Mark A. Iadicola, Lin Hu, Anthony D. Rollett, Timothy J. Foecke

Sheet specimens of 5754 aluminum alloy 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, a

Measurement of Temperature, Displacement, and Strain in Structural Components Subject to Fire Effects: Concepts and Candidate Approaches

September 28, 2012

Author(s)

Therese P. McAllister, William E. Luecke, Mark A. Iadicola, Matthew F. Bundy

For the last forty years, NIST has led the world in fire metrology through research conducted at the Large Fire Laboratory, which is being expanded to enable experiments on real-scale structures under combined structural and fire loads. The combined

Digital image correlation measurements during gusset plate connection testing to structural failure.

August 28, 2012

Author(s)

Mark A. Iadicola

This report describes 3-dimensional (3D) digital image correlation to measure the 3D shape, displacement, and in-plane strain field, during testing of gusset plate structural connections. Twelve full-scale bridge gusset plate connections of various

An Investigation of the Accuracy of Diffraction Stress Evaluation of Textured Materials

August 4, 2012

Author(s)

Thomas H. Gnaupel-Herold, Adam A. Creuziger, Mark A. Iadicola

The determination of residual or applied stress through X-ray or neutron diffraction is generally regarded as a mature method. Most x-ray diffractometers can be used to perform a measurement of lattice strain vs. tilt angle, which is then converted into

Quantitative evaluation of digital image correlation as applied to large-scale gusset plate experiments

June 21, 2012

Author(s)

Mark A. Iadicola, Robert S. Zobel, Justin M. Ocel

As part of the National Cooperative Highway Research Project 12-84 "Guidelines for the Load and Resistance Factor Design and Rating of Gusset-Plate Connections for Steel Bridges" the Federal High-way Administration (FHWA) is performing large-scale gusset