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 language | English (US) |
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Pages (from-to) | 114-118 |
Number of pages | 5 |
Journal | Scripta Materialia |
Volume | 111 |
DOIs | |
State | Published - 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