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On skin microrelief and the emergence of expression microwrinkles

On skin microrelief and the emergence of expression microwrinkles
On skin microrelief and the emergence of expression microwrinkles
Over the course of a life time, as a result of adaptive mechanobiological processes (e.g. ageing), or the action of external physical factors such as mechanical loading, the human skin is subjected to, and hosts complex biophysical processes. These phenomena typically operate through a complex interplay, that, ultimately, is responsible for the evolutive geometrical characteristics of the skin surface. Wrinkles are a manifestation of these effects. Although numerous theoretical models of wrinkles arising in multi-layered structures have been proposed, they typically apply to idealised geometries. In the case of skin, which can be viewed as a geometrically complex multi-layer assembly, it is pertinent to question whether the natural skin microrelief could play a significant role in conditioning the characteristics of compression-induced micro-wrinkles by acting as an array of geometrical imperfections. Here, we explore this question through the development of an anatomically-based finite strain parametric finite element model of the skin, represented as a stratum corneum layer on top of a thicker and softer substrate. Our study suggests that skin microrelief could be the dominant factor conditioning micro-wrinkle characteristics for moderate elastic modulus ratios between the two layers. Beyond stiffness ratios of 100, other factors tend to overwrite the effects of skin microrelief. Such stiffness ratio fluctuations can be induced by changes in relative humidity or particular skin conditions and can therefore have important implications for skin tribology.
1744-683X
Limbert, G.
a1b88cb4-c5d9-4c6e-b6c9-7f4c4aa1c2ec
Kuhl, E.
657fbf98-2455-4bd1-afb7-e9560f6ccab7
Limbert, G.
a1b88cb4-c5d9-4c6e-b6c9-7f4c4aa1c2ec
Kuhl, E.
657fbf98-2455-4bd1-afb7-e9560f6ccab7

Limbert, G. and Kuhl, E. (2018) On skin microrelief and the emergence of expression microwrinkles Soft Matter

Record type: Article

Abstract

Over the course of a life time, as a result of adaptive mechanobiological processes (e.g. ageing), or the action of external physical factors such as mechanical loading, the human skin is subjected to, and hosts complex biophysical processes. These phenomena typically operate through a complex interplay, that, ultimately, is responsible for the evolutive geometrical characteristics of the skin surface. Wrinkles are a manifestation of these effects. Although numerous theoretical models of wrinkles arising in multi-layered structures have been proposed, they typically apply to idealised geometries. In the case of skin, which can be viewed as a geometrically complex multi-layer assembly, it is pertinent to question whether the natural skin microrelief could play a significant role in conditioning the characteristics of compression-induced micro-wrinkles by acting as an array of geometrical imperfections. Here, we explore this question through the development of an anatomically-based finite strain parametric finite element model of the skin, represented as a stratum corneum layer on top of a thicker and softer substrate. Our study suggests that skin microrelief could be the dominant factor conditioning micro-wrinkle characteristics for moderate elastic modulus ratios between the two layers. Beyond stiffness ratios of 100, other factors tend to overwrite the effects of skin microrelief. Such stiffness ratio fluctuations can be induced by changes in relative humidity or particular skin conditions and can therefore have important implications for skin tribology.

Text SOFT MATTER (2017) Skin wrinkling and microrelief 19 December 2017 - Revision 1
Restricted to Repository staff only until 2 January 2019.
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More information

Accepted/In Press date: 2 January 2018
e-pub ahead of print date: 2 January 2018

Identifiers

Local EPrints ID: 416791
URI: https://eprints.soton.ac.uk/id/eprint/416791
ISSN: 1744-683X
PURE UUID: 75f59633-9e25-44ff-b7c8-36b3eada096b

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Date deposited: 10 Jan 2018 17:30
Last modified: 10 Jan 2018 17:30

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Contributors

Author: G. Limbert
Author: E. Kuhl

University divisions

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