飞机机体模型撞击混凝土靶体动力学行为研究

飞机撞击混凝土建筑物的撞击过程中，机体和发动机的撞击可以分开考虑.机体结构在强轴向冲击情况下会发生包括高度非线性的变形、断裂和飞散等的渐进撞毁现象，这些物理现象主要会影响冲击载荷的时间历程.本研究采用显式有限元方法对飞机机体模型撞击载荷试验进行了的动力学模拟，模拟中机体采用了Johnson Cook材料模型和失效模型.计算得到的飞机尾部减加速度曲线、靶体上承受的冲击载荷时间曲线与试验测量和Riera理论计算结果均具有较好的一致性，说明研究采用的计算方法和材料模型及参数是合理的，可用于后续的大型民用客机撞击载荷的数值模拟，也证明了Riera理论模型的实用性.

FEA Simulation of the Dynamic Behaviorof a Scaled Aircraft Fuselage Model Impacting on a Concrete Block

During the impact, the aircraft fuselage and its engine are considered soft and hard separately so that can be treated separately. The progressive crushing of an aircraft fuselage under extreme axial impact is a mixture process of highly nonlinear deformation, fracture and fragmentation, which will mainly affect the time history of the impact load. The research adopted the explicit FEA method to simulate the scaled aircraft fuselage impact test, and the Johnson Cook material model and failure model were used. The simulated result agrees well with the test result and Riera theory calculation, which indicated the computation method and material model were reasonable and could be applied to the numerical simulation of large commercial aircrafts impact load. At the same time, the practicality of Riera theory was demonstrated.