Elastic properties of tendon measured by two different approaches
Elastic properties of tendon measured by two different approaches
复制标题
DOI：
10.1016/s0301-5629(01)00442-2
复制
发表时间：
2001-09-01
影响因子：
2.9
通讯作者：
Li, ML
中科院分区：
文献类型：
--
作者：
Kuo, PL;Li, PC;Li, ML
采用两种不同的方法评估肌腱的弹性特性。使用6个新鲜的牛跟腱标本。第一种方法是使用循环压缩松弛法，沿横向（e垂直）和纵向（e平行）直接测量杨氏模量。杨氏模量是根据测量的应变和应力值推导出来的。小菌种e -平行与e -垂直之比约为4，大菌种e -平行与e -垂直之比降至0.6，近似于1.1。第二种方法假定肌腱是横向各向同性的。通过不同传播方向的声速测量，得到了三个可观测的二阶弹性刚度常数c（11）、c -13和c -33。测量的弹性刚度常数也与第一种方法的结果相关。结果表明，横向各向同性假设在小应变下是有效的。然而，两种方法之间存在显著差异。差异主要是由于与第一种方法相关的粘弹性。
Elastic properties of tendon were assessed by two different approaches. Six fresh bovine Achilles tendon specimens were used. The first approach directly measured Young's modulus along the transverse direction (E-perpendicular) and the longitudinal direction (E-parallel), using a cyclic compression-relaxation method. Young's moduli were derived based on the measured strain and stress values. The ratio of E-parallel: E-perpendicular at smaller strains was around 4 and decreased to 0.6 similar to1.1 at larger strains. The second approach assumed that tendons are transversely isotropic. Three observable second-order elastic stiffness constants (c(11), C-13 and C-33) were obtained by sound speed measurements along various propagation directions. The measured elastic stiffness constants were also correlated with results from the first approach. It was shown that the transverse isotropy assumption was valid at small strains. However, a significant discrepancy existed between the two approaches. The discrepancy was primarily due to viscoelasticity associated with the first approach.