Abstract
Under the environmental conditions of the aircraft carrier surface, the structure of the carrier aircraft has to withstand the interaction between the takeoff and landing impact load and the corrosion of the marine environment. 38CrMoAl steel is the main material of a carrier aircraft structure which is frequently subjected to impact load. In order to obtain its dynamic fracture toughness under corrosive conditions, it was tested by a experimental–numerical method. The dynamic constitutive model parameters of the corroded 38CrMoAl steel were obtained through dynamic mechanical tests, which were imported into the established finite element model to obtain the dynamic fracture factor time history curve of the material under corrosive conditions. Then, the dynamic crack initiation time of the corroded 38CrMoAl steel was obtained by the three-point bending dynamic fracture toughness test device. Combined with the dynamic fracture factor time history curve, the dynamic fracture toughness of the corroded 38CrMoAl steel was determined. Finally, the fracture mechanism of 38CrMoAl steel under the interaction between corrosion and high strain rate loading was analyzed according to the fracture morphology and EDS energy spectrum of specimens with different loading rates and corrosion cycles. This method provides a new idea for testing the dynamic fracture toughness of corroded materials.
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