Vannah W M, Childress D S
Rehabilitation Engineering Program, Northwestern University, Chicago, IL 60625.
J Rehabil Res Dev. 1993;30(2):205-9.
Many soft tissues are considered to be virtually incompressible. A number of recent analyses of the mechanics of these tissues have used Poisson's ratios in the range of 0.45 to 0.49 with little or no documentation, the apparent assumption being that a small change in Poisson's ratio will not significantly affect the results. We demonstrate here that the mechanics of a narrowly contained soft tissue are, instead, strongly sensitive to small changes in compressibility about the incompressible limit. Relevant practical examples include analysis of the mechanics of soft tissues within the sockets of artificial legs, pressure sore problems, and the calculation of strains within the soft tissues of a fracture gap.
许多软组织被认为实际上是不可压缩的。最近对这些组织力学的一些分析使用了泊松比在0.45至0.49范围内，但几乎没有或根本没有文献记录，明显的假设是泊松比的微小变化不会显著影响结果。我们在此证明，相反，狭窄容纳的软组织力学对不可压缩极限附近压缩性的微小变化非常敏感。相关的实际例子包括对假肢插座内软组织力学的分析、压疮问题以及骨折间隙软组织内应变的计算。
