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Title: X-ray tomography system to investigate granular materials during mechanical loading

We integrate a small and portable medical x-ray device with mechanical testing equipment to enable in situ, non-invasive measurements of a granular material's response to mechanical loading. We employ an orthopedic C-arm as the x-ray source and detector to image samples mounted in the materials tester. We discuss the design of a custom rotation stage, which allows for sample rotation and tomographic reconstruction under applied compressive stress. We then discuss the calibration of the system for 3D computed tomography, as well as the subsequent image reconstruction process. Using this system to reconstruct packings of 3D-printed particles, we resolve packing features with 0.52 mm resolution in a (60 mm){sup 3} field of view. By analyzing the performance bounds of the system, we demonstrate that the reconstructions exhibit only moderate noise.
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [4] ;  [1]
  1. James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637 (United States)
  2. (United States)
  3. Department of Radiology, The University of Chicago, Chicago, Illinois 60637 (United States)
  4. Department of Radiation and Cellular Oncology, The University of Chicago, Chicago, Illinois 60637 (United States)
Publication Date:
OSTI Identifier:
22314425
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CALIBRATION; COMPUTERIZED TOMOGRAPHY; DESIGN; DYNAMIC LOADS; GRANULAR MATERIALS; IMAGE PROCESSING; IMAGES; MECHANICAL TESTS; SPATIAL RESOLUTION; STRESSES; X RADIATION; X-RAY SOURCES