Publications

Displaying 76 - 100 of 136

Experimental characterization and crystal plasticity finite element modeling of heterogeneous deformation in commercial purity titanium

September 1, 2011

Author(s)

Y Yang, L. Wang, C. Zambaldi, P. Eisenlohr, R. Barabash, W. Liu, Mark R. Stoudt, M. A. Crimp, T. R. Bieler

Heterogeneous deformation, including local dislocation shear activity and lattice rotation, was analyzed in microstructure patches of polycrystalline, commercial purity titanium specimens using three different experimental methods. Crystal plasticity

On the Relationship Between Deformation-Induced Surface Roughness and Plastic Strain in AA5052 Is it Really Linear?

August 1, 2011

Author(s)

Mark R. Stoudt, Joseph B. Hubbard, Stefan D. Leigh

Three different heat treatments of aluminum alloy AA5052 were subjected to various levels of uniaxial plastic strain. The resulting surface topographies were then evaluated using scanning laser confocal microscopy (SLCM) and stylus profilometry

Weibull Regression Analysis of Filtered Surface Roughness Data and Strain Prediction in a Metallic Alloy

July 1, 2011

Author(s)

Joseph B. Hubbard, Mark R. Stoudt, Antonio Possolo

We fit a two-parameter Weibull regression (WR) model by maximum likelihood estimation (MLE) to filtered surface roughness data. These data were acquired by scanning confocal laser microscopy performed on aluminum alloy AA5754-O surfaces that were subjected

The Fundamental Relationships Between Deformation-Induced Surface Roughness, Critical Strain Localization, and Failure in AA5754-O

September 1, 2009

Author(s)

Mark R. Stoudt, Joseph B. Hubbard

The apparent clustering observed in localized strain maps constructed from deformation-induced surface topographies generated in AA5754-O by three in-plane deformation modes were analyzed by two different methods. One used a conventional two-point

A Study of the Fundamental Relationships Between Deformation-Induced Surface Roughness and Strain Localization in AA5754

July 1, 2009

Author(s)

Mark R. Stoudt, Joseph B. Hubbard, Mark A. Iadicola, Stephen W. Banovic

This research characterizes deformation-induced surface roughness produced by 3, in plane, proportional strain modes to determine the microstructural conditions that promote strain localization in AA5754-O aluminum alloy sheet. Integrating high-resolution

Introduction to JOM Spotlight on Magnesium: Applications and Advanced Processing

November 1, 2008

Author(s)

Mark R. Stoudt

No abstract

The Fundamental Relationships Between Grain Orientation, Deformation-Induced Surface Roughness and Strain Localization in an Aluminum Alloy

September 24, 2007

Author(s)

Mark R. Stoudt, Lyle E. Levine, Adam A. Creuziger, Joseph B. Hubbard

Polycrystalline AA6022 tensile specimens were cut from 1 mm sheet stock, mechanically polished, and uniaxially strained in-situ under a scanning laser confocal microscope (SLCM) using a sub-sized universal testing apparatus. Prior to deformation, electron

Proceedings of the NIST/USCAR Workshop on Friction Issues Related to Metal Forming

September 17, 2007

Author(s)

Mark R. Stoudt

The NIST Metallurgy Division has initiated a research project to study the friction behavior of automotive alloys during sheet metal forming. The principal driving force behind this research is the variability observed in the friction behavior between the

Topography of Metallic Surfaces Subjected to Plastic Strain: Roughness, Spatial Correlations, and Eigenvalue Spectral Entropy

July 19, 2007

Author(s)

Joseph B. Hubbard, Mark R. Stoudt, Lyle E. Levine

We employ scanning confocal laser microscopy (SLCM) to obtain topographic images of the surface of an aluminum alloy subjected to various levels of uniaxial strain. These images are discretized into a square array of pixels, each of which is then assigned

A Combined Study of Surface Roughness in Polycrystalline Aluminum During Uniaxial Deformation Using Laser-Induced Photoemission and Confocal Microscopy

January 23, 2007

Author(s)

M Cai, Mark R. Stoudt, Lyle E. Levine, J T. Dickinson

A new technique inegrating measurements of photo stiulated electron (PSE) emission and scanning laser confocal microscopy (SLCM) has been developed to characterize the deformation of an aluminium alloy in uniaxial plastic strain. Real time, in situ PSE

Topography of Metallic Surfaces Subjected to Plastic Strain: Roughness Correlations and Eigenvalue Spectra

January 10, 2007

Author(s)

Joseph B. Hubbard, Mark R. Stoudt, Lyle E. Levine

Analysis of Deformation-Induced Surface Morphologies in Steel Sheet

July 1, 2005

Author(s)

Mark R. Stoudt, Joseph B. Hubbard

The surfaces of strained mild steel sheet specimens were examined with scanning laser confocal microscopy. Rigorous assessments were employed to establish the form of the roughness data. The small deviations from the ideal conditions observed in these

Evolution of Deformation Induced Surface Morphologies Generated in Fe-based Sheet

March 1, 2005

Author(s)

Mark R. Stoudt, Joseph B. Hubbard, Stephen W. Banovic

The complex strain states that exist within a real metal stamping are likely to generate different surface morphologies when compared to the same level of plastic strain produced via single pass deformation. This study quantifies the surface morphology

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