用多散斑扩散波光谱研究软固体中的非均匀力学行为
Multispeckle diffusing wave spectroscopy as a tool to study heterogeneous mechanical behavior in soft solids
摘要：
多重散斑扩散波光谱（MSDWS）可以应用于测量软固体中的空间非均匀力学行为，具有对变形的高灵敏度以及空间和时间分辨率。在本文中，我们讨论了从MSDWS数据的变形率的量化背后的数学方法，并提供了优化测量中的实验参数的选择的指导方针。在对弹性体进行拉伸试验验证该方法后，我们通过测量胶带剪切脱粘过程中变形率的空间分布来提供MSDWS潜力的一个例子。定量描述了加载条件下与剪切和剥离有关的变形速率分布。观察到一个高度不均匀的变形速率分布，与时间相关的测量显示，在变形局部化完全脱粘前数百秒的增加。这种行为，以前预测的理论和模拟，在这里首次实验证明。
英文摘要：
Multiple speckle diffusing wave spectroscopy (MSDWS) can be applied to measure spatially heterogeneous mechanical behavior in soft solids, with high sensitivity to deformation and both spatial and temporal resolution. In this paper, we discuss the mathematical approach behind the quantification of the deformation rate from MSDWS data and provide guidelines for optimizing the selection of experimental parameters in measurements. After validating the method in extensional tests on an elastomer, we provide an example of the potentiality of MSDWS by measuring the spatial distribution of the deformation rate during shear debonding of adhesive tapes. We quantitatively characterize the deformation rate distribution related to shearing and peeling under loading. A highly heterogeneous deformation rate distribution is observed, and time-dependent measurements reveal an increase in deformation localization hundreds of seconds before full debonding. This behavior, previously predicted by theory and simulation, is here demonstrated experimentally for the first time.
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