Damage analysis of typical structures of aircraft under high-velocity fragments impact

Abstract

In this paper, by establishing a fragmented field of a prefabricated fragment warhead and simulating the intersection of the aircraft and the fragment field under dynamic conditions, the determination of the distribution of the vulnerable parts of a specific aircraft is realized. On this basis, the structural characteristic test pieces of the vulnerable parts were tested with the high-velocity impact experiments based on the two-stage light-gas gun. Based on the FEM-SPH self-adaptive method, a numerical simulation model with a high reduction degree was established. Combined with the experimental results, the damage mode of high-velocity prefabricated spherical fragments to typical vulnerable structures, especially the characteristics of secondary damage caused by debris clouds were studied. This paper verified the feasibility of methods for the vulnerable structure distribution of the aircraft by combing the shooting-line method and the Monte Carlo method. The FEM-SPH adaptive method simulates the damage mode and secondary damage caused by debris clouds on vulnerable aircraft structures. The study in this paper can be severed as an analysis tool in specific aircraft design and damage mode analysis under different threat sources.

Keywords

• Battle damage simulation
• FEM-SPH
• LS-DYNA
• High-velocity fragment
• Two-stage light-gas gun