Material properties of commonly-used interface materials and their static coefficients of friction with skin and socks.
Material properties of commonly-used interface materials and their static coefficients of friction with skin and socks.
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发表时间：
1998-06
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通讯作者：
J. Sanders;J. M. Greve;S. Mitchell;S. G. Zachariah
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作者：
J. Sanders;J. M. Greve;S. Mitchell;S. G. Zachariah
研究了假肢矫形器中不同支撑材料的抗压刚度及其与皮肤和袜子的静摩擦系数。测试的材料包括Spenco、Poron、尼龙增强硅胶、Soft Pelite、Medium Pelite、Firm Plastazote、Regular Plastazote和Nickelplast。位移控制的测试装置，以评估CS的11.1毫米直径的材料试样在循环载荷（1赫兹），220千帕超过10分钟和60分钟的时间。结果显示局部CS范围为687 kPa（Poron）至3，990 kPa（Soft Pelite）。为了在4.0%的满量程输出误差内拟合循环应力-应变（S-S）数据，Spenco、Poron和尼龙增强硅胶所需的最小拟合阶数为三阶多项式; Soft Pelite、Medium Pelite、Firm Plastazote和Regular Plastazote为二阶多项式; Nickelplast为线性拟合。对于所有材料，未回收的菌株与加载时间相关，使用指数拟合。使用双轴力控制载荷施加装置评估皮肤-材料、袜-材料和皮肤-袜界面处的COF，向10.2 x 7.8 mm加载垫施加1 - 4 N的剪切力。COF范围为0.48（+/- 0.05）至0.89（+/- 0.09）。皮肤-材料界面处的COF显著高于皮肤-袜子界面处的COF（p < 0.05）。有一种趋势，在袜子材料界面比皮肤袜子界面的COF更高。这些数据是潜在的效用在有限元建模的残肢假肢接受腔系统或身体矫形器系统的灵敏度分析，以表征界面压力和剪切应力分布的材料特性的影响。
Compressive stiffness (CS) of different supporting materials used in prosthetics and orthotics and their static coefficients of friction (COF) with skin and socks were characterized. Materials tested included Spenco, Poron, nylon-reinforced silicone, Soft Pelite, Medium Pelite, Firm Plastazote, Regular Plastazote, and Nickelplast. A displacement-controlled testing device was constructed to assess the CS of 11.1 mm diameter material specimens under cyclic loading (1 Hz) to 220 kPa over 10- and 60-min periods. Results demonstrated local CS ranging from 687 kPa (Poron) to 3,990 kPa (Soft Pelite). To fit the cyclic stress-strain (S-S) data within an error of 4.0 percent full-scale output, the minimum order of fit required for Spenco, Poron, and nylon-reinforced silicone was a third-order polynomial; for Soft Pelite, Medium Pelite, Firm Plastazote, and Regular Plastazote, a second-order polynomial; and for Nickelplast, a linear fit. For all materials, the nonrecovered strains were related to loading time using an exponential fit. A biaxial force-controlled load applicator device was used to assess COF at skin-material, sock-material, and skin-sock interfaces for shear forces of 1 to 4 N applied to a 10.2 x 7.8 mm loading pad. COFs ranged from 0.48 (+/- 0.05) to 0.89 (+/- 0.09). COFs at skin-material interfaces were significantly (p < 0.05) higher than those at skin-sock interfaces. There was a trend of a higher COF at sock-material interfaces than at skin-sock interfaces. These data are of potential utility in finite element modeling sensitivity analysis of residual limb-prosthetic socket systems or body-orthosis systems to characterize effects of material features on interface pressure and shear stress distributions.