Crashworthiness Of Fuselage Structure With Waved-plate Layout Based On Simulation

In recent twenty years, crashworthiness has been and will continue to be the main concern in aviation safety. The fuselage section should be designed to have the crashworthiness capabilities to improve the occupant survivability during crash. Because of the rapidly developed aeronautical technology and material science, composite material is widely used, and it has become the main structure material for the transport aircraft.In this paper, three waved-plate layouts of subfloor concerning the typical transport aircraft fuselage section are suggested, and the key modeling technologies of fuselage section are researched. The effects of different waved-plate layouts on aircraft fuselage section crashworthiness are studied, and the influence of different roll angles are also researched. The crashworthiness of fuelage section with metal skin and composite skin are both analyzed, and the crashworthiness of composite fuselage section with different composite skin ply angle and plies are also researched. The main conclusions are listed as follows:(1)In the process of fuselage structure modeling, geometry cleanup, meshing and connection handling have an important influence on the efficiency and accuracy of the calculation.(2)The failure modes, acceleration response and energy-absorption of fuselage section can be significantly affected by the difference of the subfloor waved-plate layouts.(3)The change of roll angles will affect fuselage section deformation and seat peak overloads, and the crashworthiness of aircraft structure can be effectively improved by choosing the appropriate landing way.(4)Compared with the acceleration response of the metal skin fuselage section, the seat average response of composite skin fuselage section is lower, and acceleration response is gentler, which indicate that the crashworthiness of composite skin fuselage section is better than that of metal skin fuselage section if the static strength meets requirement.(5)The crashworthiness of transport aircraft fuselage section can be significantly improved by selecting the appropriate composite skin ply angle and plies for the composite skin fuselage section.