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Search Publications by: Lyle E. Levine (Fed)

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Displaying 101 - 125 of 135

AFM Observations of Slip Band Development in AI Single Crystals

October 16, 2008
Author(s)
D E. Kramer, M Savage, Lyle E. Levine
In situ atomic force microscopy (AFM) is used to observe the structure and evolution of slip bands on the surface of plastically deformed aluminum single crystals. Both the structure and evolution of the slip bands are observed to be a function of the

Complementary Experimental Techniques for Multi-Scale Modeling of Plasticity

October 16, 2008
Author(s)
Lyle E. Levine, Gabrielle G. Long, David R. Black
Some recently-developed experimental techniques, such as in situ ultra-small-angle X-ray scattering (USAXS), have demonstrated a capability for measuring aspects of dislocation structure evolution that are inaccessible to other experimental methods

Crystal Asymmetry Induces Single-Atom Chain Formation in Gold Nanowires

October 16, 2008
Author(s)
Francesca Tavazza, A Hasmy, Lyle E. Levine, Anne M. Chaka, Luis C. Rincon, M Marquez, Carlos A. Gonzalez
We performed density functional theory and tight-binding molecular dynamics calculations to investigate the formation of suspended linear atom chains when stretching gold nanowires along the [110] crystal orientation. We determined that the chain formation

Deformation of Metals

October 16, 2008
Author(s)
R M. Thomson, Lyle E. Levine, Y Shim
Plastic deformation of a metal is possible because of the production and motion of large numbers of dislocations. Dislocations are one dimensional flexible spaghetti-like defects that interact with one another with both long range (1/r) and short range

Preface to Dislocatrions 2000 Proceedings

October 16, 2008
Author(s)
Lyle E. Levine, L -. Kubin, R -. Becker
During the 1950's and 1960's, a widespread international effort was underway to lay the foundations for a fundamental, dislocations-based understanding of plastic deformation and strain hardening. This effort lagged, however, as the existing theoretical

Self Assembly of a Nanoscale 3D Conductive Network Within an Amorphous Polymer

October 16, 2008
Author(s)
Lyle E. Levine, Gabrielle G. Long, R A. Gerhardt, R Ou, Jan Ilavsky, C A. Parker
The realization of a 3D network of self-assembled conductive nanowires embedded within an insulating matrix is demonstrated. The lengths, three-dimensional configurations and electrical connectivity of test wire networks are characterized. straight

Single-Crystal Plasticity: Statistical Physics and Experiments

October 16, 2008
Author(s)
Lyle E. Levine, R M. Thomson, M Savage, D E. Kramer, Y Shim
Although deformation usually appears to be a smooth process at the macroscopic scale, at smaller scales it is highly heterogeneous in both time and space, with fluctuations playing a crucial role. Over the past several years, we have used a variety of

Slip Bands in Deforming Metals

October 16, 2008
Author(s)
R M. Thomson, Lyle E. Levine, M Savage
It is proposed that a deforming solid is composed of two types of deforming regions: regions of percolating slip (slip bands) and regions of non percolating slip (matrix). The slip bands are identified with channels between GNB's (Geometrically Necessary

Effect of the Spherical Indenter Tip Assumption on Nanoindentation

June 1, 2007
Author(s)
Li Ma, Lyle E. Levine
Nanoindentation is increasingly being used to explore mechanical properties on a local scale. One of the interests and challenges of nanoindentation is determining the shear stress at the onset of plastic yielding, which corresponds to dislocation

X-Ray Imaging with Ultra-Small-Angle X-Ray Scattering as a Contrast Mechanism

October 1, 2004
Author(s)
Lyle E. Levine, Gabrielle G. Long
A new transmission X-ray imaging technique based upon ultra-small-angle X-ray scattering (USAXS) is described. Images are formed from angle-filtered X-rays that are scattered by electron density variations within the sample. Stereo USAXS imaging provides

Influence of Heating Rate on Flow Stress in High-Speed Machining Processes

April 1, 2004
Author(s)
Timothy J. Burns, Robert W. Ivester, Michael Kennedy, Richard L. Rhorer, Matthew A. Davies, Howard Yoon, Lyle E. Levine, Richard J. Fields, D Basak, Eric P. Whitenton
For several decades, a major focus of machining research has been the measurement and prediction of temperature. Here, the influence of the rate of heating on the flow stress, and the implications of this for finite-element modeling of high speed metal

Thermal Imaging of Metals in a Kolsky-Bar Apparatus

October 1, 2003
Author(s)
Howard W. Yoon, D Basak, Richard L. Rhorer, Eric P. Whitenton, Timothy J. Burns, Richard J. Fields, Lyle E. Levine
For materials testing at elevated temperatures, we describe the design and the development of a resistively heated Kolsky-bar apparatus. The temperature of the sample is determined by non-contact thermometry and the spatial temperature gradients in the

Kolsky Bar With Electrical Pulse Heating of the Sample

June 1, 2003
Author(s)
Eric P. Whitenton, Michael Kennedy, Matthew A. Davies, Gerald V. Blessing, Brian S. Dutterer, Richard L. Rhorer, Howard W. Yoon, Lyle E. Levine, Richard J. Fields, D Basak, Timothy J. Burns
The accuracy of simulations for modeling of machining processes is often limited due to insufficient knowledge of the material properties during machining, which can involve strain rates on the order of 104 per second or higher, plus rapid material heating

Asymptotic Behavior of a Strain Percolation Model for a Deforming Metal

March 1, 2003
Author(s)
Y Shim, Lyle E. Levine, R M. Thomson, D E. Kramer
In this paper, we present a recent advance in theoretical understanding of a deforming metal, using a strain percolation model which possibly explains spasmodic, fine slip line burst events occurring in the metal. The model addresses how the additional