标题： 波在模型动脉中的传播 显示英文标题

标题： Wave propagation in a model artery

摘要： 流体填充的管道在人工结构和生物体中都很常见。在后者中，如动脉这样的生物管道具有独特的性质，因为它们的管壁由柔软、不可压缩、高度可变形的材料制成。在本文中，我们通过实验研究一种模型动脉中的波传播：一个与刚性水道耦合的弹性体条带。我们使用合成肖莱恩成像技术测量面外波，并证实了一种色散模式，该模式类似于由心跳激发的脉搏波。通过施加静态压力差，我们揭示了预应力对这种波色散的显著影响。基于考虑材料流变学和条带大静态变形的声弹性理论模型，我们证明施加的压力通过拉伸（与传播方向垂直）和曲率引起的刚度之间的相互作用来影响波的传播。最后，我们通过讨论在存在预应力的情况下，从脉搏波速度测量中确定动脉壁材料特性的相关性，突出了我们的结果在生物环境中的重要性。 显示英文摘要

摘要： Fluid filled pipes are ubiquitous in both man-made constructions and living organisms. In the latter, biological pipes, such as arteries, have unique properties as their walls are made of soft, incompressible, highly deformable materials. In this article, we experimentally investigate wave propagation in a model artery: an elastomer strip coupled to a rigid water channel. We measure out-of-plane waves using synthetic Schlieren imaging, and evidence a single dispersive mode which resembles the pulse wave excited by the heartbeat. By imposing an hydrostatic pressure difference, we reveal the strong influence of pre-stress on the dispersion of this wave. Using a model based on the acoustoelastic theory accounting for the material rheology and for the large static deformation of the strip, we demonstrate that the imposed pressure affects wave propagation through an interplay between stretching, orthogonal to the propagation direction, and curvature-induced rigidity. We finally highlight the relevance of our results in the biological setting, by discussing the determination of the arterial wall's material properties from pulse wave velocity measurements in the presence of pre-stress.