Experimental investigation on characteristics of layered ice spheres under high-velocity impact

被引：0
|
作者：
Tan X. [1 ]
Feng X. [1 ]
Hu Y. [1 ]
Xie R. [1 ]
Yang S. [1 ]
Bai Y. [1 ]
机构：
[1] Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2020年 / 40卷 / 11期
关键词：
Dynamic failure; High velocity impact; Impact force; Internal layer; Layered ice sphere;
D O I：
10.11883/bzycj-2020-0047
中图分类号：
学科分类号：
摘要：
The hail impact has become a realistic threat for aerospace industries. Natural hail ice has a spherically-layered construction. In order to study the impact failure characteristics and damage ability of hail ice, spherically-layered ice spheres with two layers were created. A series of high- velocity impact experiments were conducted for the simulated hail ice spheres (both monolithic and spherically layered ice) through a smooth barrel gas gun. The dynamic failure properties of ice spheres were studied using high-speed video images during the impact event. Based on the experimental results, it is found that both the monolithic and layered ice spheres present the similar macroscopic crushing characteristics. The ice fragments are formed in the early impact stage. Fragments trajectories lie almost in the target plane. The angle between the fragment trajectories and the plane of the target increases with the increase of impact kinetic energy. A possible explanation for this phenomenon could be attributed to the release rate of projectile kinetic energy. The impact force histories of ice spheres under different velocities were recorded by a force measurement bar apparatus. The impact force curves of monolithic ice show a trend of a sudden increase of the force reaching a maximum, followed by a more gradually decreasing force versus time decay. However, the impact force curves of layered ice show a second rising signal at the last stage. The formation mechanism of the secondary rise signal is hypothesized that the internal small ball is not completely fragmented due to the deflection of failure front at the interlayer interface during impact process. The measured peak impact force is observed to increase with the increase of the projectile kinetic energy. The maximum peak force is reached at very early stage of the impact. Then the ice is actually fragmented, which can not transfer more momentum in the impact direction. In addition, there is a suggestion of higher impact forces for layered ice. This result is expected that the fragmentation process of layered-ice spheres is delayed by the interlayer interface, which is able to transfer much more momentum in the direction of the impact. The achievements of the study are helpful to better understand the dynamic mechanical behaviors of ice under impact loading, and can also provide reference for the safe design of aerocraft structure. © 2020, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.
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