Dynamic strength, particle deformation, and fracture within fluids with impact-activated microstructures

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Authors
  1. Petel, O.E.
  2. Ouellet, S.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);Carleton Univ, Ottawa ONT (CAN) Dept of Mechanical and Aerospace Engineering
Abstract
The evolution of material strength within several dense particle suspensions impacted by a projectile is investigated and shown to be strongly dependent on the particle material in suspension. For stronger particles, such as silicon carbide, the shear strength of the fluid is shown to increase with the ballistic impact strength. For weaker particles, such as silica, the shear strength of the suspension is found to be independent of impact strength in this dynamic range of tests. A soft-capture technique is employed to collect ejecta samples of a silica-based shear thickening fluid, following a ballistic impact and penetration event. Ejecta samples that were collected from impacts at three different velocities are observed and compared to the benchmark particles using a Scanning Electron Microscope. The images show evidence of fractured and deformed silica particles recovered among the nominally 1µm diameter monodisperse spheres. There is also evidence of particle fragments that appear to be the result of interparticle grinding. The trends observed in the shear strength estimates are interpreted with regards to the particle damage seen in the ejecta recovery experiments to develop a concept of the impact response of these fluids. The results suggest that particle slip through deformation is likely the dominant factor in limiting the transient impact strength of these fluids. Particularly, particle strength is important in the formation and collapse of dynamically jammed parti
Keywords
Ballistic Impact;Ejecta recovery;Particle Fracture;Shear Strength;Dense particle suspension
Report Number
DRDC-RDDC-2017-P095 — External Literature
Date of publication
01 Nov 2017
Number of Pages
13
Reprinted from
American Institute of Physics / Journal of Applied Physics, Vol 122, Issue number: 025108 (2017), p. 1-8
DSTKIM No
CA045430
CANDIS No
805838
Format(s):
Electronic Document(PDF)

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