에너지밀도 기반 초고속충돌 금속재 파편의 위협 예측

초록

The material fracture following a hypervelocity impact induces a hydrodynamic behavior. This behavior is greatly affected by the density of the material. To compute and quantify the threat of the debris generated by the hypervelocity impact, a witness plane hit by the dispersed debris was used. A statistical analysis based on the energy density, the kinetic energy of the debris concentration on each unit section in the witness plane, was performed. The hypervelocity impact analysis was then performed by the non-linear analysis software LS-DYNA. Here, projectiles and target plates consisting of 3 types of materials including aluminum, steel, and tungsten were used. The projectile with a velocity of 4 km/s impacted the target plate, and a witness plane was set behind the target plate to study the behavior of the debris. By analyzing the results of dispersion area, it was found that the area occupied by the debris was about 45% of the maximum area that the debris can disperse. In addition, the level of debris threat was estimated by the maximum energy density value. A type of secondary damage such as the localized fracture and penetration was analyzed by a coefficient of variation based on the energy density distribution in the danger region.

키워드