不同加载速度对大鼠骨生物力学特性的影响

Effects of different loading speeds on bone biomechanical properties of rats

本实验观察了在三点弯曲力学实验中，在不同运动速度（５ｍｍ／ｍｉｎ，２０ｍｍ／ｍｉｎ）的加载条件下，即在不同的加载速度时，大鼠肱骨最大载荷、弹性载荷、最大挠度、弹性挠度、最大应力、弹性应力、最大应变、弹性应变８项骨生物力学指标的变化特点。结果表明：与５ｍｍ／ｍｉｎ加载速度相比较，在２０ｍｍ／ｍｉｎ加载速度下，骨最大载荷、弹性载荷、最大挠度、弹性挠度显著增加（Ｐ＜０．０５）；骨最大应力、弹性应力、最大应变、弹性应变无明显变化。提示：三点弯曲力学实验中，在一定范围内提高加载速度，主要影响骨结构力学特性。

Under the condition of different loading speeds,the changes in ultimate load,elastic load,ultimate deformation,elastic deformation,ultimate stress,elastic stress,ultimate strain,and elastic strain were observed in the three point bending experiments.Results showed that at 20 mm/min loading speed,compared to 5 mm/min,ultimate load,elastic load,ultimate deformation and elastic deformation increased significantly ( P <0 05),but ultimate stress,elastic stress,ultimate strain and elastic strain had no change.It is suggested that the increases in the loading speed mainly affect structural properties of bone,but nearly have no effects on material properties.