Yamamoto N, Hayashi K
Department of Mechanical Engineering, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Siga, Japan.
Biomed Mater Eng. 1998;8(2):83-90.
The tensile properties of the rabbit patellar tendon were determined at a very high extension rate (560 mm/s), and were compared to those obtained at lower rates (53 and 0.33 mm/s). A closed-loop servo-hydraulic material test machine was used for the tensile tests at the rates of 560 and 53 mm/s. Strain was determined using a high-speed video dimension analyzer consisting of a line sensor camera, control unit, and image processing board. For the tests at 0.33 mm/s, a conventional tensile tester and video dimension analyzer were utilized. The tensile strength and strain at failure of the tendon increased by 51 and 77%, respectively, with increase in the extension rate from 0.33 to 560 mm/s (from 0.566 to 1250% s(-1) in strain rate); these parameters increased by 35 and 42%, respectively, with the rate change from 0.33 to 53 mm/s (from 0.566 to 151% s(-1)). However, there were no significant differences in the tangent modulus among the three rates. These results indicate that tensile strength and strain at failure increase with increase in strain rate, with no change in tangent modulus.
在非常高的拉伸速率（560毫米/秒）下测定了兔髌腱的拉伸性能，并与在较低速率（53和0.33毫米/秒）下获得的拉伸性能进行了比较。使用闭环伺服液压材料试验机以560和53毫米/秒的速率进行拉伸试验。使用由线传感器相机、控制单元和图像处理板组成的高速视频尺寸分析仪测定应变。对于0.33毫米/秒的试验，使用传统的拉伸试验机和视频尺寸分析仪。随着拉伸速率从0.33毫米/秒增加到560毫米/秒（应变率从0.566%增加到1250%s⁻¹），腱的拉伸强度和断裂应变分别增加了51%和77%；随着速率从0.33毫米/秒变化到53毫米/秒（应变率从0.566%变化到151%s⁻¹），这些参数分别增加了35%和42%。然而，三种速率下的切线模量没有显著差异。这些结果表明，拉伸强度和断裂应变随应变率的增加而增加，而切线模量不变。
