利用修正QLV方程评估人体颈椎韧带阻尼特性

Estimates Damping Properties of Human Cervical Spine Ligaments by Modified QLV Method

脊椎韧带的阻尼特性在生物力学中起着非常重要的作用。为了在生理范围表征脊椎韧带的阻尼特性,利用应力松弛实验数据,采用似线性黏弹性理论模型,对三种韧带(包括前纵韧带-ALL,后纵韧带-PLL和黄韧带-LF)的阻尼性质进行模拟和分析。基于修正的QLV七参数模型给出复模量的理论公式。又考察应变对阻尼特性的影响。结果表明:LF与ALL和PLL阻尼特性不同。评估韧带阻尼范围受应变影响。

The damping property of ligament plays an important role in biomechanics. In order to characterize the comprehensive viscoelastic behavior of cervical spine ligaments within their physiological range, quasi-linear viscoelastic theory model and the data from stress relaxation experiments are used to investigate the damping property of three types of human cervical spine ligaments （ the anterior longitudinal ligament-ALL, the posterior longitudinal ligarnent-PLL and the ligamentum flavum-LF）. Theory formula of complex modulus basing on a seven parameter model is presented. The influence of strain is also investigated. The results show that： LF exhibits a different damping characteristic from ALL and PLL; the different strains have an influence on estimating the damping range of ligament.