大飞机货舱地板下部结构有限元建模与适坠性分析

为了研究大飞机坠撞特性及数值分析方法，选取大飞机货舱地板下部结构为研究对象，建立其有限元模型，实现显式动力学的求解与分析。考察倒置、固支的货舱地板下部结构在200 kg落重以7 m/s垂直冲击下的结构响应、吸能与失效的动态行为，识别落重冲击过程中结构变形与失效模式、冲击响应特性及能量吸收与耗散机理。仿真结果表明，货舱地板下部结构的机身框组件、支撑件组件是主要吸能结构，冲击能量的吸收主要依靠上述结构的塑性变形与失效，紧固件的吸能贡献仅占1%左右。

Finite element modeling and crashworthiness analysis of large aeroplane sub-cargo structure

To research the crashworthiness characteristics of the large aeroplane and numerical analysis, a finite element model for typical sub-cargo structure is established and the solution and analysis of explicit dynamics are realized. The dynamic behavior of the structural response, energy absorption and failure of the inverted and clamped sub-cargo structure under the vertical impact of 200 kg drop weight with a 7 m/s velocity are investigated. The failure mode, impact response and energy absorption and dissipation characteristics of structure are identified and analyzed during the impact process. The simulation results show that the fuselage frame components and the support assembly of sub-cargo structure are the main energy absorption structures under this crash condition. The absorption of impact energy mainly depends on the plastic deformation and failure of the structure, while the energy absorption from the fasteners joints is only about 1%.