Publications

Displaying 51 - 75 of 91

Thermally-activated constitutive model including dislocation interactions, aging and recovery for strain path dependence of solid solution strengthened alloys: Application to AA5754-O

December 1, 2015

Author(s)

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

A thermally-activated constitutive model is developed based on dislocation interactions, crystallographic orientations and microstructural evolution to describe the elasto-plastic stress-strain behavior during multi-axial loading. The aim is to contribute

Finite Element Modeling of Deformation Behavior of Steel Specimens under Various Loading Scenarios

July 15, 2015

Author(s)

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

Lightweighting materials (e.g., advanced high strength steels, aluminum alloys etc.) are increasingly being used by automotive companies as sheet metal components. However, accurate material models are needed for wider adoption. These constitutive material

Uncertainty in Retained Austenite Measurements Applied to Individual Crystallographic Orientations

May 6, 2015

Author(s)

Adam A. Creuziger, Thomas H. Gnaeupel-Herold

A technique to measure the phase volume fraction of an individual orientation and the uncertainty in the measurement is demonstrated in this paper. The technique of complete pole figure averaging was used to assess the phase fraction of retained austenite

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

Crystallographic Texture Evolution in 1008 Steel Sheet During Multi-Axial Tensile Strain Paths

January 7, 2014

Author(s)

Adam A. Creuziger, Lin Hu, Thomas H. Gnaeupel-Herold, Anthony D. Rollett

This paper considers the crystallographic texture evolution in a 1008 low carbon steel. The texture evolution along uniaxial, plane strain and balanced biaxial strain states were measured. For uniaxial testing, grains tend to rotate such that the {111}

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

Measurement of Uncertainty in Orientation Distribution Function (ODF) Calculations

October 28, 2013

Author(s)

Adam A. Creuziger, Komal Syed, Thomas H. Gnaeupel-Herold

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

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

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