Abstract: The dynamic response and failure mode of the fuselage structure under explosive impact loads must be studied to determine the location of the minimum risk bomb that satisfies the airworthiness requirements. Taking the typical fuselage structure of a certain type of aircraft as the research object, this study uses the LS-DYNA commercial software to establish the numerical model of the dynamic response of the typical fuselage structure under explosive impact loads. The control variable method is adopted to analyze the effects of the explosive equivalent, explosive impact distance and explosive impact location on the dynamic response and failure mode of typical fuselage structures. Meanwhile, the residual strength of typical fuselage structures after damage is studied. Results show that the critical equivalent of explosives causing effective damage to the fuselage structure is closely related to the blast impact distance; the blast impact distance has little effect on the damage and residual strength of typical fuselage structures; the position of steel bars of typical fuselage structures has considerable influence on the residual strength. On this basis, the dimensionless coefficients representing the residual strength are proposed, and the functional relationship between the dimensionless coefficients of the residual strength, and the explosive equivalent and explosion impact distance is established.

Key words: explosion shock waves, least risk bomb location, numerical simulation, damage study, residual strength