PASSIVE BIAXIAL MECHANICAL-PROPERTIES OF ISOLATED CANINE MYOCARDIUM
PASSIVE BIAXIAL MECHANICAL-PROPERTIES OF ISOLATED CANINE MYOCARDIUM
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DOI：
10.1113/jphysiol.1983.sp014738
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发表时间：
1983-01-01
影响因子：
5.5
通讯作者：
YIN, FCP
中科院分区：
文献类型：
--
作者：
DEMER, LL;YIN, FCP
对犬心肌的离体片进行主要纤维和交叉纤维方向的循环加载和卸载，以确定被动力学性能。双轴载荷下的肌纤维既表现出非线性弹性，也表现出粘弹性，在应力-应变关系的位置上具有一定的应变率依赖性，但在应力-应变环的加载和卸载部分所包围的区域中具有很小的速率依赖性。纤维和交叉纤维方向表现出各向异性行为，各向异性的程度和方向都取决于获得样本的心脏区域。在同一试样中，双轴加载与单轴加载相比，对材料性能产生不同的解释。
Excised sheets of canine myocardium were subjected to cyclic loading and unloading in the predominant fiber and cross-fiber directions to determine passive mechanical properties. Myocardium under biaxial loading exhibits both non-linear elasticity and viscoelasticity with some strain-rate dependence in the position of the stress-strain relations, but very little rate dependence in the area enclosed by the loading and unloading portions of the stress-strain loops. Fiber and cross-fiber directions demonstrate anisotropic behavior, with both the degree and direction of the anisotropy being dependent upon the region of the heart from which specimens are obtained. In the same specimen biaxial as compared with uniaxial loading yields different interpretations as to the material properties.