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Title: Quantitative In Situ Studies of Dynamic Fracture in Brittle Solids Using Dynamic X-ray Phase Contrast Imaging

Journal Article · · Experimental Mechanics
ORCiD logo [1];  [2];  [3];  [3];  [4];  [5];  [6];  [6]; ORCiD logo [7];  [8];  [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering and Hopkins Extreme Materials Inst.
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS) and Dynamic Compression Sector (DCS)
  5. Army Research Lab., Adelphi, MD (United States). Weapons and Materials Research Directorate
  6. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. Johns Hopkins Univ., Baltimore, MD (United States). Hopkins Extreme Materials Inst. and Dept. of Mechanical Engineering

We demonstrate the use of X-ray phase contrast imaging with sub-microsecond temporal resolution to obtain quantitative visualization of dynamic fracture processes in brittle solids. We examine an amorphous solid (fused silica), a ceramic single crystal (single-crystal quartz), and a polycrystalline ceramic (boron carbide), in the form of single-edge notched specimens loaded using a three-point apparatus at nominal strain rates up to ~800 s–1. We observe that the crack tip speed for boron carbide is relatively independent of mode I stress intensity factor rate (K˙I) for these rates of loading, while that of fused silica and single-crystal quartz increases with K˙I. Further, for the amorphous and single crystal cases, we observe the development of a crack tip instability in the form of crack branching as the crack tip speed approaches 45% of the Rayleigh wave speed. This suggests that strain-rate-dependent mechanisms contribute to crack branching. Such mechanisms may, in turn, affect the macroscopic fracture properties of these materials.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Washington State Univ., Pullman, WA (United States). Inst. of Shock Physics
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Defense Threat Reduction Agency (DTRA); US Army Research Laboratory (USARL); USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Contributing Organization:
Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics and Dynamic Compression Sector (DCS)
Grant/Contract Number:
AC52-06NA25396; HDTRA1-15-1-0056; W911NF-12-2-0022; NA0002442; AC02-06CH11357
OSTI ID:
1473815
Alternate ID(s):
OSTI ID: 1484023; OSTI ID: 1571759
Report Number(s):
LA-UR-18-20842
Journal Information:
Experimental Mechanics, Vol. 58, Issue 9; ISSN 0014-4851
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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