实时多帧成像揭示的超音速微粒对弹性体的冲击动力学

Dynamics of supersonic microparticle impact on elastomers revealed by real-time multi-frame imaging.

作者信息

Veysset David, Hsieh Alex J, Kooi Steven, Maznev Alexei A, Masser Kevin A, Nelson Keith A

机构信息

Institute for Soldier Nanotechnologies, MIT, Cambridge, Massachusetts 02139, USA.

Department of Chemistry, MIT, Cambridge, Massachusetts 02139, USA.

出版信息

Sci Rep. 2016 May 9;6:25577. doi: 10.1038/srep25577.

DOI:10.1038/srep25577

PMID:27156501

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4860635/

Abstract

Understanding high-velocity microparticle impact is essential for many fields, from space exploration to medicine and biology. Investigations of microscale impact have hitherto been limited to post-mortem analysis of impacted specimens, which does not provide direct information on the impact dynamics. Here we report real-time multi-frame imaging studies of the impact of 7 μm diameter glass spheres traveling at 700-900 m/s on elastomer polymers. With a poly(urethane urea) (PUU) sample, we observe a hyperelastic impact phenomenon not seen on the macroscale: a microsphere undergoes a full conformal penetration into the specimen followed by a rebound which leaves the specimen unscathed. The results challenge the established interpretation of the behaviour of elastomers under high-velocity impact.

摘要

了解高速微粒撞击对于从太空探索到医学和生物学等许多领域都至关重要。迄今为止，对微观尺度撞击的研究仅限于对受撞击样本的事后分析，这种分析无法提供关于撞击动力学的直接信息。在此，我们报告了直径7μm的玻璃球以700 - 900m/s的速度撞击弹性体聚合物的实时多帧成像研究。对于聚（脲基甲酸酯尿素）（PUU）样本，我们观察到一种在宏观尺度上未见过的超弹性撞击现象：一个微球完全贴合地穿透样本，随后反弹，样本未受损伤。这些结果对弹性体在高速撞击下行为的既定解释提出了挑战。