Rate-independent characteristics of an arthroscopically implantable force probe in the human Achilles tendon
Rate-independent characteristics of an arthroscopically implantable force probe in the human Achilles tendon
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DOI：
10.1016/s0021-9290(98)00167-5
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发表时间：
1999-02-01
影响因子：
2.4
通讯作者：
Hale, JE
中科院分区：
文献类型：
--
作者：
Hall, GW;Crandall, JR;Hale, JE
针对两点加载的可植入式力传感器，研究了加载速率对试件标定的影响。这种传感器包含一个应变计，用于测量由于软组织样本中的Co拉伸载荷而施加到传感器上的压缩载荷。在四个人类尸体下肢中的每一个中的跟腱上装有力传感器，然后使用材料试验机加载张力。在三种不同的位移速率（0.25、2.5和12.7 cm s（-1））下对每个样本进行拉伸试验，分别对应于33.8、513.2和2838.6 N s（-1）的平均载荷速率。针对每个试样/位移速率组合，生成与力传感器信号和施加的钢筋束张力相关的校准曲线。对于每个样本，通过计算整个数据集的RMS误差（e（RMS）=满载值的1.6%）和所有数据的曲线拟合的决定系数R-2（R-2 = 99.6%）来比较校准曲线。在测试的速率范围内，未观察到由于加载速率引起的传感器灵敏度的可测量变化。所有位移速率的滞后约为2.4%。(C)1999爱思唯尔科技有限公司。保留所有权利。
The effect of loading rate on specimen calibration was investigated for an implantable force sensor of the two-point loading variety. This variety of sensor incorporates a strain gage to measure the compressive load applied to the sensor due Co tensile loading in a soft tissue specimen. The Achilles tendon in each of four human cadaveric lower extremities was instrumented with a force sensor and then loaded in tension using a materials testing machine. Each specimen was tensile tested at three different displacement rates, 0.25, 2.5 and 12.7 cm s(-1), corresponding with mean loading rates of 33.8, 513.2, and 2838.6 N s(-1), respectively. A calibration curve relating the force sensor signal and applied tendon tension was generated for each specimen/displacement rate combination. For each specimen, calibration curves were compared by calculating an RMS error for the entire data set (e(RMS) = 1.6% of the full load value) and a coefficient of determination, R-2, of a curve fit through all of the data (R-2 = 99.6%). Over the range of rates tested, no measurable change in sensor sensitivity due to loading rate was observed. Hysteresis for all displacement rates was on the order of 2.4%. (C) 1999 Elsevier Science Ltd. All rights reserved.