论文标题
在高度拉伸的软板上引导的弹性波
Guided elastic waves in a highly-stretched soft plate
论文作者
论文摘要
我们研究了高度伸展的Ecoflex \ c {OpyRyight}板（几乎不可压缩的弹性体）中引导弹性波的传播。该板受到近距离应力的影响，伸长率达到120％，我们测量了剪切水平模式SH0的平面位移和在低频限制中共存的板模式S0的板模式。首先观察到诱导的各向异性，并以两个主方向遵循相位速度。尽管这些测量值提供了初始的应力估计，但我们证明了大声弹性理论的局限性，以预测预应力弹性体中的那些相速度。考虑到弹性体的频率依赖性剪切模量，该理论添加了实验驱动的分数流变模型。这提供了最高80％伸长率的相速度的正确预测。
We study the propagation of guided elastic waves in a highly-stretched Ecoflex\c{opyright} plate, a nearly incompressible elastomer. The plate is subjected to a nearly-uniaxial stress with an elongation reaching 120% and we measure in-plane displacements of the shear horizontal mode SH0 and of the plate mode S0 coexisting in the low frequency limit. An induced anisotropy is first observed and characterized by following the phase velocities in two principal directions. Although these measurements provide an initial stress estimate, we evidence the limits of the acoustoelastic theory to predict those phase velocities in a prestressed elastomer. Taking into account the frequency dependent shear modulus of the elastomer, an experiment-driven fractional rheological model is added to the theory. This provides a proper prediction of phase velocities up to 80% elongation.
