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Skin Prestretch Evaluation Adapting Mooney-Rivlin Model

Siti Noor Azizzati Mohd Noor and Jamaluddin Mahmud
Faculty of Mechanical Engineering, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
Abstract—This paper aims to assess the influence of skin prestretch to the stress-stretch relations in defining skin behaviour and properties via a parametric study. Skin prestretch evaluation based on the mathematical model derivation of Mooney-Rivlin constitutive equation is presented in the form of stress-stretch curves. Prestretch term, λp, is included in the re-derivation of engineering stretch, σE and principal stretch, λ, relations. A set of skin prestretch parametric study along with a Matlab programme are designed and executed. The results show that prestretch terms influence the stress-stretch curve behaviour along with other Mooney-Rivlin material constants (C1 and C2). It was found that 0.2 unit difference in C1 (ΔC1) produced the largest effect compared to 0.2 unit difference in C2 (ΔC2) and prestretch λp (Δλp). The knowledge and information related to hyperelastic constitutive model gained from this study is beneficial to the development of skin constitutive model.

Index Terms—mooney-rivlin model, hyperelastic material, skin prestretch, stress-stretch curve

Cite: Siti Noor Azizzati Mohd Noor and Jamaluddin Mahmud, "Skin Prestretch Evaluation Adapting Mooney-Rivlin Model," Journal of Medical and Bioengineering, Vol. 4, No. 1, pp. 31-35, February 2015. Doi: 10.12720/jomb.4.1.31-35

 
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