Investigations of the mechanical properties of the spinal cord at high strain rates for computer simulation model of the spinal cord injury

本研究自制高速拉伸装置（最大十字头速度1000 mm/s），对软脑膜（后外侧沟、后正中隔、齿状韧带）和脊髓实质（灰质、白色物质）的力学特性进行了研究，这些都是分析脊髓内部应力分布的重要部位。结果表明，该材料具有典型的非线性和粘弹性应力-应变响应，其刚度随应变和应变率的增加而增加。此外，在高应变率下，灰质比白色物质更硬，但在较低的机械应变下失效。

In the present study, we made the original high speed tensile equipment(Maximum crosshead speed 1, 000mm/s), and investigated the mechanical properties of the pia mater(postero-lateral sulcus, posterior median septum, dentate ligament) andspinal parenchyma(gray matter, white matter), which are the important parts to analyze the stress distribution within the spinal cord. The results exhibit the characteristic nonlinear and viscoelastic stress-strain response, in which the stiffness of the material increases with strain and strain rate. Furthermore, the gray matter is stiffer but fails at a lower mechanical strain than the white matter at high strain rates.