摘要
介绍了自行研究和组装的测试心肌组织试件基本力学性质的实验设备和方法。完成了对6个狗心脏10个不同位点的肌肉组织的三种力学性质测试,包括:单轴拉伸、松弛和破坏实验,得到了这些位点心肌组织的应力-应变曲线、应力松弛曲线和强度极限。从实验数据中可知:左心室心外膜的刚度和强度最大,右心房侧壁、右心房心耳、房间膈的刚度和强度最小,其余位点介于两者之间。根据Pole-zero模型对所得拉伸数据进行了参数拟合,试验数据和模型之间的相关性较好。根据松弛实验的结果对Pole-zero模型进行了修正,增加了一个粘弹性项。
The testing setup and method to accomplish tensile tests of canine heart muscle tissues are developed The tests including three types： uniaxial tension, relaxation and fracture, applied at 10 selected sites of 6 canine hearts. The stress-strain curves, stress relaxation curves and damage limits of the heart muscle were obtained. It is found that the epcardium of left ventricular lateral wall has the highest stiffness and strength, while right atrium lateral wall, right atrium appendix, atrium interseptum have the lowest stiffness and strength, with other sites fitted in between. The tension test data were used to fit the Pole-zero model and the correlation between them is satisfied. A viscoelastic item was added to modify the Pole-zero model due to the relaxation test data.
出处
《工程力学》
EI
CSCD
北大核心
2007年第12期169-174,共6页
Engineering Mechanics
关键词
生物力学
力学性质
实验研究
心肌
拉伸
biomechanics
mechanical properties
experimental study
cardiac muscle
tension
