High Rate Compressive Behaviour of a Dilatant Polymeric Foam

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Authors
  1. Bhagavathula, K.B.
  2. Azar, A.
  3. Ouellet, S.
  4. Satapathy, S.
  5. Dennison, C.R.
  6. Hogan, J.D.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN);Alberta Univ, Edmonton ALTA (CAN) Dept of Mechanical Engineering
Abstract
Polymeric foams are an essential part of personal protection equipment, such as helmets and body armor. In this work, the authors study the strain-rate dependent behavior of a dilatant polymeric foam, focusing on developing characterization and testing methodologies needed to better understand the links between microstructure and failure in these materials. The authors study these links for a commercially-available shear-thickening foam, named D3O LITE D. Prior to testing, the pore sizes (82 ± 26 µm), ligament thickness between pores (5–12 µm), and porosity (83 ± 5%) were quantified using scanning electron microscope images. Samples were then tested in compression under quasi-static conditions for a strain rate of 0.04 s-1 using an MTS testing apparatus, and in dynamic conditions using a split Hopkinson pressure bar apparatus for strain rates of 5280–5720 s-1. For both rates, strains upwards of 85% were achieved and this allowed us to examine a variety of material failure behaviors, including elastic collapse, localization, pore collapse, densification and post pore collapse hardening. These mechanisms are observed in-situ during compression experiments using high-speed photography, and linked back to stress–strain responses of the materials. In this material, the elastic collapse stress for quasi-static and dynamic compression conditions was found to be 120 ± 40 kPa and 243 ± 47 kPa, respectively, and elastic modulus were noted of 2.4 ± 0.7 MPa and 3.8 ± 1.2 MP
Keywords
Foam;High-rate;Mechanical characterisation;Dilatant material
Report Number
DRDC-RDDC-2018-P161 — External Literature
Date of publication
01 Oct 2018
Number of Pages
13
Reprinted from
Journal of Dynamic Behavior of Materials. https://doi.org/10.1007/s40870-018-0176-0
DSTKIM No
CA047580
CANDIS No
808040
Format(s):
Electronic Document(PDF)

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