论文标题
薄弹性变形材料的应力，应变和刚度的无损映射
Non-destructive mapping of stress, strain and stiffness of thin elastically deformed materials
论文作者
论文摘要
了解软材料中的压力是基础研究和实际应用的基本兴趣，例如软物质设备，生物材料工程和医学科学。但是，以非侵入性的方式测量应力场原位是一项挑战。如果材料的机械性能未知或因应力改变，就变得更加困难。在这里，我们提出了一种强大的非破坏性技术，能够测量弹性变形薄膜中的原位应力和应变，而无需了解其材料特性。该技术基于测量弹性波速度，然后使用我们为羔羊波得出的通用分散曲线来预测局部应力和应变。使用光学相干断层扫描，我们实验验证了橡皮纸，保鲜膜和乐器皮肤皮肤的方法。
Knowing the stress within a soft material is of fundamental interest to basic research and practical applications, such as soft matter devices, biomaterial engineering, and medical sciences. However, it is challenging to measure stress fields in situ in a non-invasive way. It becomes even more difficult if the mechanical properties of the material are unknown or altered by the stress. Here we present a robust non-destructive technique capable of measuring in situ stress and strain in elastically deformed thin films without the need to know their material properties. The technique is based on measuring elastic wave speeds, and then using a universal dispersion curve we derived for Lamb wave to predict the local stress and strain. Using optical coherence tomography, we experimentally verified the method for a rubber sheet, a cling film, and the leather skin of a musical instrument.
