Heterogeneity in deformation of granular ceramics under dynamic loading

J. Y. Huang, L. Lu, D. Fan, T. Sun, K. Fezzaa, S. L. Xu*, M. H. Zhu, S. N. Luo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

Dynamic compression experiments are conducted on micron-sized SiC powders of different initial densities with a split Hopkinson pressure bar. Digital image correlation is applied to images from high-speed X-ray phase contrast imaging to map dynamic strain fields. The X-ray imaging and strain field mapping demonstrate the degree of heterogeneity in deformation depends on the initial powder density; mesoscale strain field evolution is consistent with softening or hardening manifested by bulk-scale loading curves. Statistical analysis of the strain probability distributions exhibits exponential decay tail similar to those of contact forces, which are supposed to lead to the grain-scale heterogeneity of granular materials.

Original languageEnglish (US)
Pages (from-to)114-118
Number of pages5
JournalScripta Materialia
Volume111
DOIs
StatePublished - Jan 15 2016

Funding

This work is supported by the 973 Project (No. 2014CB845904) and NSFC (No. 11472253 ) of China. Use of the Advanced Photon Source was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

Keywords

  • Digital image correlation
  • Dynamic compaction
  • Heterogeneous deformation
  • Powder processing
  • X-ray imaging

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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