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Resolving the viscoelasticity and anisotropy dependence of the mechanical properties of skin from a porcine model

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Abstract

The mechanical response of skin to external loads is influenced by anisotropy and viscoelasticity of the tissue, but the underlying mechanisms remain unclear. Here, we report a study of the main effects of tissue orientation (TO, which is linked to anisotropy) and strain rate (SR, a measure of viscoelasticity), as well as the interaction effects between the two factors, on the tensile properties of skin from a porcine model. Tensile testing to rupture of porcine skin tissue was conducted to evaluate the sensitivity of the tissue modulus of elasticity (E) and fracture-related properties, namely maximum stress \((\sigma _{U})\) and strain \((\varepsilon _{U})\) at \(\sigma _{U}\), to varying SR and TO. Specimens were excised from the abdominal skin in two orientations, namely parallel (P) and right angle (R) to the torso midline. Each TO was investigated at three SR levels, namely 0.007–0.015 \(\hbox {s}^{-1}\) (low), 0.040 \(\hbox {s}^{-1}\) (mid) and 0.065 \(\hbox {s}^{-1}\) (high). Two-factor analysis of variance revealed that the respective parameters responded differently to varying SR and TO. Significant changes in the \(\sigma _{U}\) were observed with different TOs but not with SR. The \(\varepsilon _{U}\) decreased significantly with increasing SR, but no significant variation was observed for different TOs. Significant changes in E were observed with different TOs; E increased significantly with increasing SR. More importantly, the respective mechanical parameters were not significantly influenced by interactions between SR and TO. These findings suggest that the trends associated with the changes in the skin mechanical properties may be attributed partly to differences in the anisotropy and viscoelasticity but not through any interaction between viscoelasticity and anisotropy.

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Acknowledgments

The authors are grateful to Mr. Poh Hock NEO (Nanyang Polytechnic, Singapore) for help with the experiments.

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Authors and Affiliations

  1. NUInternational Singapore Pte Ltd, Singapore, 569830, Singapore

    W. L. E. Wong & K. L. Goh

  2. School of Mechanical and Systems Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, England, UK

    W. L. E. Wong, T. J. Joyce & K. L. Goh

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  1. W. L. E. Wong
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  2. T. J. Joyce
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Correspondence to K. L. Goh.

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Wong, W.L.E., Joyce, T.J. & Goh, K.L. Resolving the viscoelasticity and anisotropy dependence of the mechanical properties of skin from a porcine model. Biomech Model Mechanobiol 15, 433–446 (2016). https://doi.org/10.1007/s10237-015-0700-2

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  • DOI: https://doi.org/10.1007/s10237-015-0700-2

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