Local Strain Concentrations in a Microvascular Network |
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Authors: | A R Hamilton N R Sottos S R White |
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Institution: | (1) University of Illinois at Urbana-Champaign, Urbana, IL, USA; |
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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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Keywords: | |
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