NEW EXPERIMENTS ON SHEAR MODULUS OF ELASTICITY OF ARTERIES
NEW EXPERIMENTS ON SHEAR MODULUS OF ELASTICITY OF ARTERIES
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DOI：
10.1152/ajpheart.1994.266.1.h1
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发表时间：
1994-01-01
影响因子：
--
通讯作者：
FUNG, YC
中科院分区：
文献类型：
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作者：
DENG, SX;TOMIOKA, J;FUNG, YC
虽然血管的力学性质已经被广泛研究，但血管壁的剪切模量仍然是未知的。新的数据的剪切弹性模量的大鼠动脉及其变化与轴向拉伸和血压。数据是从我们设计和建造的新仪器中获得的，用于同时进行扭转、充气和纵向拉伸测试。在生理条件下（压力= 120 mmHg或16 kPa;纵向拉伸相对于零应力状态为1.2），正常大鼠胸主动脉的剪切模量为G = 137 ± 18 kPa。在体温（37 ℃）和室温（25 ℃）下的剪切模量差异在10%以内。剪切模量随着纵向和周向应变的变化而显著变化，与这些应变引起的应变能成比例。提出了一种基于伪应变能函数的本构方程。血管壁在增量意义上不是横观各向同性的。当大鼠由于其主动脉收缩而经受高血压时，剪切模量不随动物经受高血压的时间长度而显著变化。
Although the mechanical properties of blood vessels have been studied extensively, the shear modulus of the blood vessel wall is still unknown. New data on the shear modulus of elasticity of rat arteries and its variation with axial stretch and blood pressure are presented. The data were obtained from a new instrument designed and constructed by us to perform simultaneous torsion, inflation, and longitudinal stretching tests. It was found under physiological conditions (pressure = 120 mmHg or 16 kPa; longitudinal stretch = 1.2 relative to zero-stress state), the shear modulus of normal rat thoracic aorta is G = 137+/-18 kPa. The difference of shear modulus at body temperature (37 degrees C) and room temperature (25 degrees C) is within 10%. The shear modulus varies significantly with changing longitudinal and circumferential strains in proportion to the strain energy due to these strains. A constitutive equation based on a pseudo strain energy function is proposed. The vessel wall is not transversely isotropic in the incremental sense. When the rat was subjected to high blood pressure due to constriction of its aorta, the shear modulus does not vary significantly with the length of time the animal was subjected to hypertension.