ELASTIC-CONSTANTS OF INFLATED LOBES OF DOG LUNGS
ELASTIC-CONSTANTS OF INFLATED LOBES OF DOG LUNGS
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DOI：
10.1152/jappl.1976.40.4.508
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发表时间：
1976-01-01
影响因子：
3.3
通讯作者：
RODARTE, JR
中科院分区：
文献类型：
--
作者：
LAIFOOK, SJ;WILSON, TA;RODARTE, JR
狗肺的弹性常数是在不同的充气程度下测定的。在一组实验中，叶片受到的变形近似于单轴载荷的条件。这些数据与从压力-体积曲线的局部斜率获得的体积模量数据一起用于确定描述关于均匀膨胀初始状态的小的不均匀变形所需的2个弹性模量。体积模量约为膨胀压力的4倍，杨氏模量约为膨胀压力的1.5倍。在第二组实验中，使用直径为 1-3 厘米的圆柱形冲头对叶瓣进行压痕测试。从这些数据获得的杨氏模量值略高，大约是通货膨胀压力的两倍。肺在剪切时比在扩张时更容易变形，并且肺的泊松比很高，大约为 0.43。
The elastic constants of dog lungs were determined at various degrees of inflation. In one set of experiments, the lobes were subjected to deformations that approximated the conditions of uniaxial loading. These data, together with the bulk modulus data obtained from the local slope of the pressure-volume curve, were used to determine the 2 elastic moduli that are needed to describe small nonuniform deformations about an initial state of uniform inflation. The bulk modulus was approximately 4 times the inflation pressure, and Young''s modulus was approximately 1.5 times the inflation pressure. In a 2nd set of experiments, lobes were subjected to indentation tests using cylindric punches 1-3 cm in diameter. The value for Young''s modulus obtained from these data was slightly higher, approximately twice the inflation pressure. The lung is much more easily deformable in shear than in dilatation and that the Poisson ratio for the lung is high, approximately 0.43.