成形爆薬による超高速衝突試験と飛しょう体形状の影響評価

Abstract

Seven shaped-charge hypervelocity impact tests were conducted to evaluate the Japanese Experiment Module (JEM) space debris protection stuffed Whipple shield at an approximate velocity of 11 km/s. The shape and the characteristics of the shaped-charge jet differ from those of the light gas gun because of the jet generation mechanism. It is therefore necessary to evaluate and compensate the results for a solid aluminum sphere, which is the design requirement. Comparative two-dinensional hydrocode simulations were conducted to assess the shape effects on the impact damage. The shapes assessed are arrowheads that simulate the shaped-charge jet, hollow cylinders, and solid spheres. By assessing the projectile kinetic energy, the authors concluded that the shaped-charge jet produces three to five times more severe damage to the pressure wall than the solid sphere, even if both have the same mass. The authors also confirmed that the shaped-charge testing and hydrocode simulation correlate well for the pressure wall damage.