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arXiv 2108.09398physics.flu-dyncond-mat.soft
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跌落冲击应力分布及表面shock wave

Stress distribution and surface shock wave of drop impact

Ting-Pi Sun, Franco Alvarez-Novoa, Klebbert Andrade, Pablo Gutierrez, Leonardo Gordillo, Xiang Cheng

摘要:

跌落冲击造成严重的表面侵蚀,决定了许多重要的自然,环境和工程过程,并要求大量的预防和保护工作。然而,尽管在过去的二十年里对撞击水滴的运动学特征进行了广泛的研究,但导致水滴撞击侵蚀的动力学过程仍然很不清楚。在这里,我们开发了一种高速应力显微镜的方法,该方法测量了负责侵蚀的跌落冲击的关键动态特性,即,冲击液滴的剪切应力和压力分布,具有前所未有的时空分辨率。我们的实验揭示了快速传播的自相似的非中心应力最大值下的冲击下降和量化的剪切力的影响基板。此外,我们研究了弹性基板的变形下的冲击和发现冲击引起的表面冲击波。我们的研究为定量测量液滴的冲击应力打开了大门,并揭示了低速液滴冲击侵蚀的起源。

英文摘要:

Drop impact causes severe surface erosion, dictating many important natural, environmental and engineering processes and calling for substantial prevention and preservation efforts. Nevertheless, despite extensive studies on the kinematic features of impacting drops over the last two decades, the dynamic process that leads to the drop-impact erosion is still far from clear. Here, we develop a method of high-speed stress microscopy, which measures the key dynamic properties of drop impact responsible for erosion, i.e., the shear stress and pressure distributions of impacting drops, with unprecedented spatiotemporal resolutions. Our experiments reveal the fast propagation of self-similar noncentral stress maxima underneath impacting drops and quantify the shear force on impacted substrates. Moreover, we examine the deformation of elastic substrates under impact and uncover impact-induced surface shock waves. Our study opens the door for quantitative measurements of the impact stress of liquid drops and sheds light on the origin of low-speed drop-impact erosion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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