Łagan Sylwia D, Liber-Kneć Aneta
Institute of Applied Mechanics, Cracow University of Technology, Cracow, Poland.
Acta Bioeng Biomech. 2017;19(2):93-102.
The aim of the study was an estimation of the possibility of using hyperelastic material models to fit experimental data obtained in the tensile test for the swine skin tissue.
The uniaxial tensile tests of samples taken from the abdomen and back of a pig was carried out. The mechanical properties of the skin such as the mean Young's modulus, the mean maximum stress and the mean maximum elongation were calculated. The experimental data have been used to identify the parameters in specific strain-energy functions given in seven constitutive models of hyperelastic materials: neo-Hookean, Mooney-Rivlin, Ogden, Yeoh, Martins, Humphrey and Veronda-Westmann. An analysis of errors in fitting of theoretical and experimental data was done.
Comparison of load -displacement curves for the back and abdomen regions of skin taken showed a different scope of both the mean maximum loading forces and the mean maximum elongation. Samples which have been prepared from the abdominal area had lower values of the mean maximum load compared to samples from the spine area. The reverse trend was observed during the analysis of the values of elongation. An analysis of the accuracy of model fitting to the experimental data showed that, the least accurate were the model of neo- -Hookean, model of Mooney-Rivlin for the abdominal region and model of Veronda-Westmann for the spine region.
An analysis of seven hyperelastic material models showed good correlations between the experimental and the theoretical data for five models.
本研究的目的是评估使用超弹性材料模型来拟合猪皮肤组织拉伸试验中获得的实验数据的可能性。
对取自猪腹部和背部的样本进行单轴拉伸试验。计算皮肤的力学性能，如平均杨氏模量、平均最大应力和平均最大伸长率。实验数据已用于确定超弹性材料的七个本构模型（新胡克模型、穆尼-里夫林模型、奥格登模型、杨模型、马丁斯模型、汉弗莱模型和韦龙达-韦斯特曼模型）中特定应变能函数的参数。对理论数据和实验数据拟合的误差进行了分析。
对取自皮肤背部和腹部区域的载荷-位移曲线的比较表明，平均最大加载力和平均最大伸长率的范围不同。与取自脊柱区域的样本相比，取自腹部区域的样本的平均最大载荷值较低。在分析伸长率值时观察到相反的趋势。对模型与实验数据拟合精度的分析表明，最不准确的是新胡克模型、腹部区域的穆尼-里夫林模型和脊柱区域的韦龙达-韦斯特曼模型。
对七个超弹性材料模型的分析表明，五个模型的实验数据和理论数据之间具有良好的相关性。
