研究目的
To analyze and understand impact ?ash signatures to determine projectile’s size and impact velocity distributions for projectile segregated by material composition and type during LY12 aluminum projectile hypervelocity impact LY12 aluminum spacecraft shield material.
研究成果
The results indicate that LY12 aluminum projectile hypervelocity impact LY12 aluminum target did yield projectile jet initiation. The n value is approximately constant 5.62 for LY12 aluminum projectile hypervelocity impact LY12 aluminum target. Future work will include performing a test series to determine impact flash signature characteristics and scaling relations for perforating impacts.
研究不足
The study is limited by the assumptions of the model: the projectile is a spherical particle, the target is a semi-infinite flat plate; the impact is normal, and the projectile and target exhibit linear Hugoniot shock properties. Future work will include performing a test series to determine impact flash signature characteristics and scaling relations for more complex impact geometries.
1：Experimental Design and Method Selection:
The study is based on the derivation of the shock jet initiated model for light flash and an understanding of how material shock properties govern the flash signature arising from the impact of a spherical projectile against a target.
2：Sample Selection and Data Sources:
Laboratory experiments were performed by Two-stage light gas gun at Intense Dynamic Loading Research Center of Shenyang Ligong University. The material of the projectile is LY12 aluminum, a solid sphere with a diameter of 5 mm. The target material is LY12 aluminum plate, a plate with a thickness of 20 mm.
3：List of Experimental Equipment and Materials:
Two-stage light gas gun, optical probe, pyrometer composed of photomultiplier tubes, oscilloscope, solar simulator as a standard light source.
4：Experimental Procedures and Operational Workflow:
The projectile was launched by the two-stage light gas gun, impacting the target in near-vacuum conditions. Optical probe pointed to impact point directly and light flash signals were acquired during the stage of the projectile interacting the target. The signals acquired were input pyrometer, which are composed of photomultiplier tubes. The pyrometer can perform conversion of optical and electric signals, and magnified real-time data was input the oscilloscope through coaxial cables.
5：Data Analysis Methods:
The variation of flash intensity with projectile radius and impact velocity was analyzed to obey a specific correlation.
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