SURFACE DEFLECTION OF PRIMATE FINGERTIP UNDER LINE LOAD
SURFACE DEFLECTION OF PRIMATE FINGERTIP UNDER LINE LOAD
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DOI：
10.1016/0021-9290(89)90048-1
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发表时间：
1989-01-01
影响因子：
2.4
通讯作者：
SRINIVASAN, MA
中科院分区：
文献类型：
--
作者：
SRINIVASAN, MA
研究皮肤和皮下软组织的生物力学对于理解负责触觉的机械感受神经末梢的转导过程具有根本重要性。在本研究中，使用锋利的楔形物施加线载荷，在体内对三名成年人和四只猴子的指尖（远端指骨）进行凹痕。拍摄所得皮肤表面偏转轮廓并用作推断构成指尖的材料的机械性质的线索。结果表明，Phyllips和约翰逊（1981）所使用的修正Boussinesq解，适用于指尖作为一个弹性半空间在平面应变状态下，预测皮肤表面的偏转轮廓，只能粗略地近似经验观察到的轮廓。作为替代方案，提出了一个简单的模型，该模型将指尖视为在平面应变条件下充满不可压缩流体的弹性膜（如“水床”）。结果表明，该模型的预测，它考虑到发生的有限变形，同意非常好的拍摄的配置文件中的区域的利益（约3毫米的负载）。
A study of the biomechanics of the skin and the subcutaneous soft tissues is of fundamental importance in understanding the process of transduction at the mechanoreceptive nerve terminals responsible for the sense of touch. In the present investigation, the fingertips (distal phalanges) of three adult humans and four monkeys were indented in vivo using a line load delivered by a sharp wedge. The resulting skin surface deflection profile was photographed and used as a clue to infer the mechanical nature of the materials that make up the fingertip. It is shown that the modified Boussinesq solution used by Phyllips and Johnson (1981), applicable when the fingertip is modeled as an elastic half-space in a state of plane strain, predicts a skin surface deflection profile that can only roughly approximate the empirically observed profiles. As an alternative, a simple model which views the fingertip as an elastic membrane filled with an incompressible fluid (like a ''waterbed'') under plane strain conditions is proposed. It is shown that the predictions of this model, which takes into account the finite deformations that occur, agree very well with the photographed profiles in the region of interest (up to about 3 mm from the load).