Scaling, Microstructure and Dynamic Fracture

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The relationship between pullback velocity and impact velocity is studied for different microstructures in Cu. A size distribution of potential nucleation sites is derived under the conditions of an applied stochastic stress field. The size distribution depends on flow stress leading to a connection between the plastic flow appropriate to a given microstructure and nucleation rate. The pullback velocity in turn depends on the nucleation rate resulting in a prediction for the relationship between pullback velocity and flow stress. The theory is compared to observations of Cu on Cu gas-gun experiments (10-50 GPa) for a diverse set of microstructures. The ... continued below

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6 p. (0.2 MB)

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Minich, R W; Kumar, M; Schwarz, A & Cazamias, J December 21, 2005.

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The relationship between pullback velocity and impact velocity is studied for different microstructures in Cu. A size distribution of potential nucleation sites is derived under the conditions of an applied stochastic stress field. The size distribution depends on flow stress leading to a connection between the plastic flow appropriate to a given microstructure and nucleation rate. The pullback velocity in turn depends on the nucleation rate resulting in a prediction for the relationship between pullback velocity and flow stress. The theory is compared to observations of Cu on Cu gas-gun experiments (10-50 GPa) for a diverse set of microstructures. The scaling law is incorporated into a 1D finite difference code and is shown to reproduce the experimental data with one adjustable parameter that depends only on a nucleation exponent, {Lambda}.

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6 p. (0.2 MB)

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PDF-file: 6 pages; size: 0.2 Mbytes

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  • Presented at: Scaling, Microstructure and Dynamic failure, Baltimore, MD, United States, Oct 02 - Oct 05, 2005

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  • Report No.: UCRL-CONF-217905
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 928174
  • Archival Resource Key: ark:/67531/metadc898210

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 21, 2005

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • April 17, 2017, 12:14 p.m.

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Minich, R W; Kumar, M; Schwarz, A & Cazamias, J. Scaling, Microstructure and Dynamic Fracture, article, December 21, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898210/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.