Three-Dimensional Characterization and Modeling of Microstructural Weak Links for Spall Damage in FCC Metals

Local microstructural weak links for spall damage were investigated using three-dimensional (3-D) characterization in multicrystalline copper samples (grain size ≈ 450  µ m) shocked with laser-driven plates at low pressures (2 to 4 GPa). The thickness of samples and flyer plates, approximately 1000...

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Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2015-10, Vol.46 (10), p.4527-4538
Main Authors: Krishnan, Kapil, Brown, Andrew, Wayne, Leda, Vo, Johnathan, Opie, Saul, Lim, Harn, Peralta, Pedro, Luo, Sheng-Nian, Byler, Darrin, McClellan, Kenneth J., Koskelo, Aaron, Dickerson, Robert
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Compatibility
Copper
crystal plasticity
Damage
Grain Boundaries
GTN
Links
localization
MATERIALS SCIENCE
Metallic Materials
Metals
Microstructure
modeling
Nanotechnology
Physical metallurgy
Plate Impact
Plates
Shock Waves
Spall damage
spall FCC shock
Strain
Structural Materials
Surfaces and Interfaces
Symposium: Dynamic Behavior of Materials VI
Thin Films
Three dimensional
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Summary:Local microstructural weak links for spall damage were investigated using three-dimensional (3-D) characterization in multicrystalline copper samples (grain size ≈ 450  µ m) shocked with laser-driven plates at low pressures (2 to 4 GPa). The thickness of samples and flyer plates, approximately 1000 and 500  µ m respectively, led to short pressure pulses that allowed isolating microstructure effects on local damage characteristics. Electron Backscattering Diffraction and optical microscopy were used to relate the presence, size, and shape of porosity to local microstructure. The experiments were complemented with 3-D finite element simulations of individual grain boundaries (GBs) that resulted in large damage volumes using crystal plasticity coupled with a void nucleation and growth model. Results from analysis of these damage sites show that the presence of a GB-affected zone, where strain concentration occurs next to a GB, correlates strongly with damage localization at these sites, most likely due to the inability of maintaining strain compatibility across these interfaces, with additional effects due to the inclination of the GB with respect to the shock. Results indicate that strain compatibility plays an important role on intergranular spall damage in metallic materials.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-014-2667-5