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Title: Correlations among void shape distributions, dynamic damage mode, and loading kinetics [Correlations among spall void shape distributions, damage mode and shock loading kinetics]

Here, 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.
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [1] ;  [3] ;  [4] ;  [3] ;  [3] ;  [3] ;  [5]
  1. Univ. of New South Wales, Canberra (Australia)
  2. Arizona State Univ., Tempe, AZ (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Peac Institute of Multiscale Sciences, Chengdu (People's Republic of China)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 69; Journal Issue: 2; Journal ID: ISSN 1047-4838
Research Org:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
36 MATERIALS SCIENCE; spall; shock; microstructure; void shape; tomography; kinetics
OSTI Identifier: