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Communication Dans Un Congrès Année : 2013

IDENTIFICATION OF MATERIAL PROPERTIES OF HUMAN SKIN IN VIVO

Résumé

The mechanical properties of skin are of interest for many applications, including the design of devices that interact with the skin and simulation of skin deformation for applications such as animation. There is also a need to better understand the mechanical behavior of the skin in order to be able to measure its properties, for example to evaluate the effect of medical treatments or cosmetics. The mechanical properties of the skin are parameters in a constitutive model, and without a suitable constitutive model they cannot be measured properly. For example, many studies have considered the skin to be linearly elastic and measured its Young's modulus but this is of limited value because of its extreme nonlinearity. The aim of this study was to use an extensive set of data obtained from tests on human subjects with multiple tests in different directions to identify anisotropic material properties. The anisotropy of the skin is complicated by the large anisotropic initial strain that it has in vivo, which has the effect of making its in situ behavior anisotropic even if its actual material properties are not. Tensile tests on ex vivo human skin [1] have shown two phases of deformation, similar to other biological membranes [2]. In the initial phase the stiffness is very low, and then when the collagen fibres in the dermis become taught the stiffness increases dramatically. It was found that the major difference between loading directions was the length of the first phase, the stiffness in the second phase was similar in all directions. There is thus close relationship between the initial strain and the anisotropic material behavior; both determine the strain that is needed to reach the stiffer second phase of deformation.
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Dates et versions

hal-01406391 , version 1 (01-12-2016)

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  • HAL Id : hal-01406391 , version 1

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Sam L Evans, Gaetan L Boyer, Jerome L Molimard, Hassan Zahouani. IDENTIFICATION OF MATERIAL PROPERTIES OF HUMAN SKIN IN VIVO. 11th International Symposium on Computer Methods in Biomechanics and Biomedical Engineering, Apr 2013, Salt Lake City, United States. ⟨hal-01406391⟩
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