Quantifying Skin Properties Using a Novel Integration Experiment-Finite Element Simulation and Skin Pre-Stretch Model
Understanding the mechanical behaviour of human skin is important in designing products that interacts with human skin. To date, there is no single quantified value that could be used to input into a finite element (FE) model. Moreover, no study has been reported on the attempt to determine skin properties using a pre-stretch FE model. Therefore, this paper for the first time attempts to investigate skin pre-stretch and ultimately determine a quantified value for skin mechanical properties by incorporating skin pre-stretch. Prior to numerical modeling and simulation, skin deformation data was obtained by developing an accurate and reliable in vivo measuring technique utilising motion capture system. 2D and 3D FE modeling and simulation for pre-stretched skin are later performed by replicating the experimental set up using the information and data obtained. By iteratively changing materials input parameters, the quantified values of skin biomechanical properties are determined when the experimental-numerical deformation matched (same deformation contour). The results show that based on Ogden's constitutive equation, the measured deformation for skin using current experiment-numerical approach matches when the Ogden's coefficient, μ = 10 Pa and Ogden's exponent, α = 100 and this is consistent either for 2D or 3D FE simulations. This highlights the novelty of the current approach and the study has contributed to the knowledge about skin deformation behaviour. Moreover, the quantified value of skin parameter could now be used as the material input for FE.
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Document Type: Research Article
Publication date: November 1, 2013
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