Correlations Among Void Shape Distributions, Dynamic Damage Mode, and Loading Kinetics

A. D. Brown, Q. Pham, E. V. Fortin, Pedro Peralta, B. M. Patterson, J. P. Escobedo, E. K. Cerreta, S. N. Luo, D. Dennis-Koller, D. Byler, A. Koskelo, X. Xiao

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Three-dimensional x-ray tomography (XRT) provides a nondestructive technique to characterize the size, shape, and location of damage in dynamically loaded metals. A shape-fitting method comprising the inertia tensors of individual damage sites was applied to study differences of spall damage development in face-centered-cubic (FCC) and hexagonal-closed-packed (HCP) multicrystals and for a suite of experiments on high-purity copper to examine the influence of loading kinetics on the spall damage process. Applying a volume-weighted average to the best-fit ellipsoidal aspect-ratios allows a quantitative assessment for determining the extent of damage coalescence present in a shocked metal. It was found that incipient transgranular HCP spall damage nucleates in a lenticular shape and is heavily oriented along particular crystallographic slip directions. In polycrystalline materials, shape distributions indicate that a decrease in the tensile loading rate leads to a transition to coalesced damage dominance and that the plastic processes driving void growth are time dependent.

Original languageEnglish (US)
Pages (from-to)198-206
Number of pages9
Issue number2
StatePublished - Feb 1 2017

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)


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