| Popis: |
The operation of aircraft is sensitive to disturbances in the dynamic environment of the fuselage while flying at flight altitudes. By generating extensive shock, pulse pressure loads from the detonation of internal high explosives can catastrophically damage the aircraft fuselage, causing significant harm, and a potential plane crash. While the induced localied failure and damage to the structure depends on the proximity and size of the charge, in the event of blasts from multiple charges, the superposition of the waves alters the propagation of the blast wave in the cabin. This chapter examines fluid–structure interaction (FSI) in the aircraft fuselage, induced by blast loading of high explosives, by using numerical and analytical methods. A review of fuselage design, basic concepts of the blast pressure, and the FSI effects on plates are presented, which are followed by an investigation of the pressure advection and FSI effects due to a single blast of spherical plastic explosive charges. The study is extended to cases of multiple blasts including FSI effects. Under these circumstances, the arrangements of charges determine the wave superposition and direction of the shock front. Analytical models for a cylindrical shell subject to uniform pulse pressures are presented with the shell response predominantly governed by bending action and the material behavior as purely elastic as well as rigid-perfectly plastic. For the rigid-perfectly plastic shell, the influence of pulse shape was examined and the method to eliminate pulse shape effects was discussed. |
