Morphology analysis of tracks in the aerogels impacted by hypervelocity irregular particles  

作　　者：Ai Du Yi Ma Mingfang Liu Zhihua Zhang Guangwei Cao Hongwei Li Ling Wang Peijian Si Jun Shen Bin Zhou 

机构地区：[1]Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Tongji University,Shanghai200092,China [2]School of Physics Science and Engineering,Tongji University,Shanghai200092,China [3]National Space Science Center,Chinese Academy of Sciences,Beijing100190,China [4]Hangzhou Dianzi University,Hangzhou310018,China [5]Hangzhou Regenovo Biotechnology Co.,Ltd.,Hangzhou310038,China

出　　处：《High Power Laser Science and Engineering》2021年第2期8-16,共9页高功率激光科学与工程（英文版）

基　　金：the National Key Research and Development Program of China(No.2017YFA0204600);the National Natural Science Foundation of China(No.11874284).

摘　　要：As an attractive collector medium for hypervelocity particles,combined with outstanding physical properties and suitable compositional characteristics,SiO2 aerogel has been deployed on outer space missions and laser shock-loaded collection experiments.In this paper,impact experiments were conducted to understand the penetration process of irregular grains,irregular Al_(2)O_(3) grains with two different sizes and speeds(~110μm@7 km/s,~251μm@2.3 km/s)at various density silica aerogels.By classifying the shapes of projectile residues and tracks,the morphology of tracks was analyzed.It was observed that there were several kinds of typical tracks in the penetration of irregular grains,accompanied by residues with the shapes of near-sphere,polyhedron,streamlined body wedge,and rotator.The rotational behavior was demonstrated by the final status of one flake projectile as direct evidence.In addition,there was no obvious relationship between the track length and experimental parameters,which may be caused by the uncertain interaction between aerogels and irregular particles.In addition,it confirmed the existence of fragmentation,melting situation by observing the shape of the impact entrance hole.At the same time,optical coherence tomography was used to observe the detail of tracks clearly,which provided a method to characterize the tracks nondestructively.

关 键 词：HYPERVELOCITY impact experiment irregular grains morphology silica aerogel 

分 类 号：O648.17[理学—物理化学]