STRUCTURE AND STRESS-STRAIN RELATIONSHIP OF SOFT-TISSUES
STRUCTURE AND STRESS-STRAIN RELATIONSHIP OF SOFT-TISSUES
复制标题
DOI：
10.1093/icb/24.1.13
复制
发表时间：
1984-01-01
期刊：
影响因子：
--
通讯作者：
FUNG, YC
中科院分区：
文献类型：
--
作者：
FUNG, YC
软组织的力学特性与其结构有关。我们将用动脉和肺的特性来说明这一点。粘弹性，应变率效应，伪弹性，和本构方程进行了讨论。然而，器官的机械特性不仅基于器官的组织，而且基于其几何形状和与邻近器官的关系。一个典型的例子是血管。肠系膜的毛细血管是“刚性的”;蝙蝠翅膀上的毛细血管是“可扩张的”;而肺的毛细血管是“片状的”：在一个平面上是刚性的，在另一个平面上是柔性的。体循环动脉的应力-应变关系是高度非线性的，随着应变的增加呈指数硬化;而肺动脉的应力-应变关系是线性的。体静脉容易收缩，而肺静脉则不然：当血压福尔斯肺泡气压时，肺静脉仍保持通畅。对这些差异的解释在于不同器官中血管与周围组织之间的不同相互作用。这些差异对血液循环的影响指出。讨论了超微结构的作用。
The mechanical properties of a soft tissue are related to its structure. Weshall illustrate this by the properties of the arteries and the lung. Viscoelasticity, strain rate effects, pseudo-elasticity, and constitutive equations ar discussed. The mecahnical properties of an organ is, however, not only based onthe tissues of the organ, but also on its geometry and relationship to the neighboring organs. A typical example is the blood vessel. The capillary blood vessels of the mesentery are “rigid”; those in the bat's wing are “distensible”; whereas the capillaries of the lung are “sheet” like: rigid in one plane, and compliant in another. The stress-strain relationship of the systemic arteries is highly nonlinear, stiffening exponentially with increasing strains; yet that of the pulmonary arteries in the lung is linear. The systemic veins are easily collapsible; yet the pulmonary veins in the lung are not: they remain patent when the blood pressure falls below the alveolargas pressure. The explanation of these differences lies in the varied interactions between the blood vessels and the surrounding tissues in different organs. The implications of these differences on blood circulation are pointed out. Therole of ultrastructure is discussed.