Scaling, Microstructure and Dynamic Fracture
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}.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 928174
- Report Number(s):
- UCRL-CONF-217905; TRN: US0804299
- Resource Relation:
- Journal Volume: 845; Conference: Presented at: Scaling, Microstructure and Dynamic failure, Baltimore, MD, United States, Oct 02 - Oct 05, 2005
- Country of Publication:
- United States
- Language:
- English
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