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

Kapil Krishnan, Andrew Brown, Leda Wayne, Johnathan Vo, Saul Opie, Harn Lim, Pedro Peralta, Sheng Nian Luo, Darrin Byler, Kenneth J. McClellan, Aaron Koskelo, Robert Dickerson

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Local microstructural weak links for spall damage were investigated using three-dimensional (3-D) characterization in multicrystalline copper samples (grain size ≈ 450 µm) shocked with laser-driven plates at low pressures (2 to 4 GPa). The thickness of samples and flyer plates, approximately 1000 and 500 µm 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.

Original languageEnglish (US)
Pages (from-to)4527-4538
Number of pages12
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number10
StatePublished - Oct 2 2015

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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