Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X03: Drops: Impacts on Solid I
8:00 AM–10:36 AM,
Tuesday, November 21, 2023
Room: Ballroom C
Chair: Abhishek Saha, University of California, San Diego
Abstract: X03.00008 : Photoelastic probing of shear and pressure forces on drop impact*
9:31 AM–9:44 AM
Presenter:
Angelo I Ledesma
(Universidad de Santiago de Chile)
Authors:
Angelo I Ledesma
(Universidad de Santiago de Chile)
Franco Ávarez Novoa
(Universidad de Santiago de Chile)
Nicolas Ramirez Ramirez
(Universidad de Santiago de Chile)
Pablo Gutierrez
(Universidad de O'Higgins)
Leonardo Gordillo
(Universidad de Santiago de Chile)
To better understand the dynamics between drops and solid materials, we analyzed drop impact on photoelastic-material substrates, enabling visualization of the solid's Rayleigh (surface) and shear (volume) waves. The technique reveals oscillating stress patterns traveling outward the target, reminiscent of axisymmetric explosion in semi-infinite media. We also present a theoretical approximation focusing on early times when the force rapidly increases to its maximum and when the largest damage occurs. We argue that erosion is rooted in the combined effect of normal and shear loads. Crater evolution due to drop impact on gypsum substrate is shown for comparison.
Our research opens avenues for probing drop impact via non-direct methods by measuring shear and pressure and for better characterizing the erosion mechanism. The findings hold significance in various fields, ranging from material science to impact engineering, with potential applications in erosion-resistant coatings and impact mitigation strategies.
*Thanks to the Chilean National Agency for Research and Development (ANID) for the financial support in my postgraduate studies.
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