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Search Publications by: Mark R. Stoudt (Fed)

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Displaying 51 - 69 of 69

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

Effect of Uniaxial Strain on the Surface Roughness of Pure MG and MG-AZ31 Alloy

February 21, 2005
Author(s)
Mark R. Stoudt, A -. Munitz, Stephen W. Banovic, Richard J. Fields
Pure Mg and Mg AZ31 alloy samples were deformed in uniaxial tension and the resultant surface topographies were characterized with optical microscopy, scanning laser confocal microscopy (SCLM) and scanning electron microsopy (SEM) techniques. Initial

Material Model for Strain-Induced Surface Roughening of Sheet Metal

May 1, 2002
Author(s)
Y Shim, Mark R. Stoudt, Lyle E. Levine, Stephen W. Banovic, Richard J. Fields
A generic model for strain-induced surface roughening has been derived from a statistical analysis of experimental data from aluminum alloys. The model predicts the surface roughening in sheet metal as a function of strain and grain size. Our analyses

The Influence of a Multilayered Metallic Coating on Fatigue Crack Nucleation

November 1, 2001
Author(s)
Mark R. Stoudt, Richard E. Ricker, R C. Cammarata
A through review of the literature on fatigue crack initiation indicates that for optimum resistance to fatigue crack initiation, a surface coating needs more than just a high hardness and that a combination of properties including toughness, cyclic work

The Influence of Grain Size on the Roughening Behavior of Al-Mg Alloys

January 1, 2001
Author(s)
Mark R. Stoudt, Richard E. Ricker
The discontinuouis plastic flow exhibited by numerous aluminum alloys presents significant challenges to the use of aluminum alloys in many automotive applications. The inhomogeneous morphology of the surface asperities generated during metal forming is

Suppression of Fatigue Cracking With Nanometer-Scale Multilayered Coatings

August 1, 2000
Author(s)
Mark R. Stoudt, R C. Cammarata, Richard E. Ricker
(Scripta Materialia doesn't use an Abstract -- Took 1st sentence of Intro) Fatigue crack initiation in initally smooth samples of ductile metals free of surface defects almost always occurs at the free surface a sa result of surface rioughening and the

Influence of Nanometer-Scale Multilayered Thin Films on Fatigue Crack Initiation

January 1, 1999
Author(s)
Mark R. Stoudt, Richard E. Ricker, R C. Cammarata
Fatigue crack initiation in initially smooth, defect free samples of ductile metals almost always occurs at the free surface as a result of surface roughening and the development of a critical surface morphology 1-3. For FCC metals with high stacking fault

Compatibility of Halon Alternatives During Storage

August 21, 1994
Author(s)
Richard G. Gann, Carlos R. Beauchamp, Thomas G. Cleary, J L. Fink, Richard H. Harris Jr., F Horkay, G B. McKenna, Thomas P. Moffat, Marc R. Nyden, Richard D. Peacock, Richard E. Ricker, Mark R. Stoudt, W. K. Waldron
A key facet of the evaluation of new fire suppressants is their behavior under pressure and at elevated temperature in a metal storage container with an elastomer seal. In this study, 13 candidate chemicals have been examines: C2F6, C3F8, C4F10, cyclo-C4F8

Agent/System Compatibility for Halon 1301 Aviation Replacement

October 20, 1993
Author(s)
Richard G. Gann, E Braun, Thomas G. Cleary, Richard H. Harris Jr., F Horkay, Gregory T. Linteris, G B. McKenna, Marc R. Nyden, Richard D. Peacock, Richard E. Ricker, Mark R. Stoudt, W. K. Waldron
This project has developed measurement methods and provided data for the appraisal of 12 USAF-specified candidate halon 1301 replacements for compatibility with flight systems, people, and the environment. The exposures of metals, elastomers and lubricants