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Erschienen in: Experimental Mechanics 9/2020

12.08.2020 | Research paper

High-Strain-Rate Behavior of a Viscoelastic Gel Under High-Velocity Microparticle Impact

verfasst von: D. Veysset, Y. Sun, J. Lem, S. E. Kooi, A. A. Maznev, S. T. Cole, R. A. Mrozek, J. L. Lenhart, K. A. Nelson

Erschienen in: Experimental Mechanics | Ausgabe 9/2020

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Abstract

Background

Impact experiments, routinely performed at the macroscale, have long been used to study mechanical properties of materials. Microscale high-velocity impact, relevant to applications such as ballistic drug delivery has remained largely unexplored at the level of a single impact event.

Objective

In this work, we study the mechanical behavior of polymer gels subjected to high-velocity microparticle impact, with strain rates up to 107 s−1, through direct visualization of the impact dynamics.

Methods

In an all-optical laser-induced particle impact test, 10–24 μm diameter steel microparticles are accelerated through a laser ablation process to velocities ranging from 50 to 1000 m/s. Impact events are monitored using a high-speed multi-frame camera with nanosecond time resolution.

Results

We measure microparticle trajectories and extract both maximum and final penetration depths for a range of particle sizes, velocities, and gel concentrations. We propose a modified Clift-Gauvin model and demonstrate that it adequately describes both individual trajectories and penetration depths. The model parameters, namely, the apparent viscosity and impact resistance, are extracted for a range of polymer concentrations.

Conclusions

Laser-induced microparticle impact test makes it possible to perform reproducible measurements of the single particle impact dynamics on gels and provides a quantitative basis for understanding these dynamics. We show that the modified Clift-Gauvin model, which accounts for the velocity dependence of the drag coefficient, offers a better agreement with the experimental data than the more commonly-used Poncelet model. Microscale ballistic impact imaging performed with high temporal and spatial resolution can serve as direct input for simulations of high-velocity impact responses and high strain rate deformation in gels and other soft materials.

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Metadaten
Titel
High-Strain-Rate Behavior of a Viscoelastic Gel Under High-Velocity Microparticle Impact
verfasst von
D. Veysset
Y. Sun
J. Lem
S. E. Kooi
A. A. Maznev
S. T. Cole
R. A. Mrozek
J. L. Lenhart
K. A. Nelson
Publikationsdatum
12.08.2020
Verlag
Springer US
Erschienen in
Experimental Mechanics / Ausgabe 9/2020
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI
https://doi.org/10.1007/s11340-020-00639-9

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