Cumulative Damage Study of Air-Dropped Vehicles with Multiple Drops Impact

The vehicle landing process is simulated by dropping the air-dropped vehicle, establishing the vehicle finite element model based on the drop test and verifying the accuracy of the model, and deriving the weak components in the vehicle drop process by transient response analysis of LS-DYNA. Based on the complete restart technology, we propose the simulation method of cumulative damage of vehicle fall and realize the simulation analysis of multiple vehicle falls and the cumulative analysis of vehicle stress state and plastic deformation. Finally, the Johnson–Cook failure damage model was combined to calculate the cumulative damage caused by the fall impact; the variation law of the damage was derived, and the structural damage was evaluated according to the failure model, which has certain guiding significance for the study of the cumulative damage of vehicle airdrop.