Suzuki Ryo, Ito Kohta, Lee Taeyong, Ogihara Naomichi
Department of Mechanical Engineering, Keio University, Yokohama, Japan.
Division of Mechanical and Biomedical Engineering, Ewha Womans University, Seoul, South Korea.
Med Eng Phys. 2017 Dec;50:83-88. doi: 10.1016/j.medengphy.2017.10.010. Epub 2017 Nov 2.
Identifying the viscous properties of the plantar soft tissue is crucial not only for understanding the dynamic interaction of the foot with the ground during locomotion, but also for development of improved footwear products and therapeutic footwear interventions. In the present study, the viscous and hyperelastic material properties of the plantar soft tissue were experimentally identified using a spherical indentation test and an analytical contact model of the spherical indentation test. Force-relaxation curves of the heel pads were obtained from the indentation experiment. The curves were fit to the contact model incorporating a five-element Maxwell model to identify the viscous material parameters. The finite element method with the experimentally identified viscoelastic parameters could successfully reproduce the measured force-relaxation curves, indicating the material parameters were correctly estimated using the proposed method. Although there are some methodological limitations, the proposed framework to identify the viscous material properties may facilitate the development of subject-specific finite element modeling of the foot and other biological materials.
识别足底软组织的粘性特性至关重要，这不仅有助于理解足部在运动过程中与地面的动态相互作用，还对改进鞋类产品和治疗性鞋类干预措施的开发具有重要意义。在本研究中，通过球形压痕试验和球形压痕试验的解析接触模型，对足底软组织的粘性和超弹性材料特性进行了实验识别。从压痕实验中获得了足跟垫的力松弛曲线。将这些曲线与包含五元件麦克斯韦模型的接触模型进行拟合，以识别粘性材料参数。利用实验确定的粘弹性参数的有限元方法能够成功再现测量的力松弛曲线，这表明使用所提出的方法正确估计了材料参数。尽管存在一些方法上的局限性，但所提出的识别粘性材料特性的框架可能会促进足部和其他生物材料的个体特异性有限元建模的发展。
