Minimizing specimen length in elastic testing of end-constrained cancellous bone.
Minimizing specimen length in elastic testing of end-constrained cancellous bone.
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DOI：
10.1016/j.jmbbm.2009.02.001
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发表时间：
2010
影响因子：
3.9
通讯作者：
W. Lievers;Stephen D. Waldman;A. K. Pilkey
中科院分区：
文献类型：
--
作者：
W. Lievers;Stephen D. Waldman;A. K. Pilkey
对松质骨进行拉伸和压缩测试时，需要末端约束，以便最大限度地减少摩擦和结构末端效应，并且不会低估力学性能。由于许多端部约束试验技术仅限于某些部位和物种所需的大样本尺寸，因此减少总样本长度将是有利的。以下研究检查了样本标距长度和纵横比对牛股骨髁松质骨弹性拉伸试验的影响。在两种不同直径（5.1、10.7 mm）下检查了三种不同标称标距长度（10、16、22 mm），这两种直径限定了松质骨试验通常使用的范围。未观察到标距长度或纵横比的影响，但观察到直径影响的证据。三维有限元法（FEM）模型证实了实验观察结果，并表明，模量的高估开始发生试样短于10毫米。
End-constraint is needed when performing tensile and compressive testing of cancellous bone so that frictional and structural end-effects are minimized and the mechanical properties are not underestimated. Since many end-constrained testing techniques are limited to certain sites and species by the large specimen sizes required, reductions in overall specimen length would be advantageous. The following study examines the effect of specimen gauge length and aspect ratio on the elastic tensile testing of cancellous bone from the bovine femoral condyle. Three different nominal gauge lengths (10, 16, 22 mm) were examined at two different diameters (5.1, 10.7 mm) which bound the range typically used for cancellous bone testing. No effect of gauge length or aspect ratio was observed, but evidence of a diameter effect was noted. Three-dimensional finite element method (FEM) models confirmed the experimental observations and demonstrated that an overestimation of modulus begins to occur for specimens shorter than 10 mm.