A structural model of the forced compression of the fingertip pulp
A structural model of the forced compression of the fingertip pulp
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DOI：
10.1016/s0021-9290(98)00067-0
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发表时间：
1998-07-01
影响因子：
2.4
通讯作者：
Rempel, D
中科院分区：
文献类型：
--
作者：
Serina, ER;Mockensturm, E;Rempel, D
当手指与外部物体接触时，指尖髓调节传递给底层肌肉骨骼系统的力。需要一个指尖牙髓的模型来表示在这些接触过程中力向肌腱、肌肉和骨骼的传递。在这项研究中，开发了一个结合材料不均匀性和几何形状的人体指尖结构模型。研究目的是确定(1)该指尖模型是否可以预测人体指尖在接触平坦刚性表面时的力-位移和力-接触面积响应，以及(2)该模型预测的应力和应变是否与人体指尖的触觉感知功能一致。在体内的指尖牙髓被模拟成一个膨胀的椭球状膜，其中包含一种不可压缩的流体，这种流体在平坦的无摩擦表面上被准静态压缩。膜被赋予皮肤的特性（Veronda和Westmann， 1970），当膨胀时，具有接近人类指尖的尺寸。允许有限变形。该模型通过Serina et al.（1997）获得的吸气力-位移关系和测量指尖在接触力介于0.25 - 7.0N的刚性表面上时的接触面积来验证。模型预测可以很好地代表实验数据，表明几何形状、非均匀材料结构和初始皮肤张力似乎代表了人体指尖牙髓在压缩下的非线性响应。指尖牙髓的预测反应与其作为触觉传感器的功能是一致的。1998爱思唯尔科学有限公司版权所有。
The fingertip pulp modulates the force transmitted to the underlying musculoskeletal system during finger contact on external bodies. A model of the fingertip pulp is needed to represent the transmission of forces to the tendons, muscles, and bone during these contacts. In this study, a structural model of the in vivo human fingertip was developed that incorporates both the material inhomogeneity and geometry. Study objectives were to determine (1) if this fingertip model can predict the force-displacement and force-contact area responses of the in vivo human fingertip during contact with a flat, rigid surface, and (2) if the stresses and strains predicted by this model are consistent with the tactile sensing functionality of the in vivo human fingertip. The in vivo fingertip pulp was modeled as an inflated, ellipsoidal membrane, containing an incompressible fluid, that is quasi-statically compressed against a flat, Frictionless surface. The membrane was assigned properties of skin (Veronda and Westmann, 1970) and when inflated, possessed dimensions approximating those of a human fingertip. Finite deformation was allowed. The model was validated by the gulp force-displacement relationship obtained by Serina et al. (1997) and by measurements of the contact area when the fingertip was pressed against a rigid surface with contact forces between 0.25 and 7.0N. Model predictions represent the experimental data sufficiently well, suggesting that geometry, inhomogeneous material structure, and initial skin tension appear to represent the nonlinear response of the in vivo human fingertip pulp under compression. The predicted response of the fingertip pulp is consistent with its functionality as a tactile sensor. (C) 1998 Elsevier Science Ltd. All rights reserved.