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Local Strain Concentrations in a Microvascular Network

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Abstract

Strain concentrations associated with the presence of a microvascular network in a polymer matrix are measured using fluorescent digital image correlation (FDIC). The accuracy of the measurement technique is established for a specimen containing only a single microchannel. The influence of localized particle reinforcement around the channel is also investigated using this simplified geometry. Three-dimensional network specimens with different structural designs were fabricated and loaded in uniaxial tension. The resulting strain concentrations are compared as a function of channel spacing and location. As expected, decreasing channel spacing leads to increased strain local to the channels. In addition, the three-dimensional nature of the channel architecture influences the resulting strain. The results provide insight into the mechanical behavior of microvascular networks and demonstrate the utility of FDIC as a characterization tool at these length scales.

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Acknowledgement

This work was supported by the Air Force Office of Scientific Research Multidisciplinary University Research Initiative (grant F49550-05-1-0346).

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Authors and Affiliations

  1. University of Illinois at Urbana-Champaign, Urbana, IL, USA

    A. R. Hamilton (SEM member), N. R. Sottos (SEM member) & S. R. White (SEM member)

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  1. A. R. Hamilton
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  2. N. R. Sottos
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  3. S. R. White
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Correspondence to N. R. Sottos.

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Hamilton, A.R., Sottos, N.R. & White, S.R. Local Strain Concentrations in a Microvascular Network. Exp Mech 50, 255–263 (2010). https://doi.org/10.1007/s11340-009-9299-5

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  • DOI: https://doi.org/10.1007/s11340-009-9299-5

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