Simulation Study Of Crack Propagation In The Panel Based On Abaqus

Simulation study of crack propagation in the panel based on Abaqus Abstract:Integrally stiffened panel is one of commonest form in aircraft structure, which is widely used in fuselage and wing. Defects in materials and structures are unavoidable. Fracture failure of integrally stiffened panel induced by defect under low stress is the most important and commonest failure mode. These problems can be resolved by fracture mechanics, however, only a handful of fracture mechanics problems have analytic solution, and numerical analysis method is needed for most of fracture mechanics problems.In order to study the characteristics of crack propagation in panel and the effect of reinforced rib on crack propagation in the panel, this paper simulated crack propagation problems of panel and integrally stiffened panel using finite element method. First, as general finite element software cannot automatically simulate crack propagation, a program package was developed to simulate crack propagation based on Abaqus using python scripting language, stress intensity factors of cracks with different initially direction was deduced and the results were compared with the results of Abaqus. Then the cracks propagation in the panels were simulated:the characteristics of crack propagation in panel was analyzed, which includes the edge crack, central90°symmetric crack, center45°symmetry crack and internal asymmetric crack, and the equivalent crack of the center symmetric cracks were analyzed. Second, the cracks propagation in the integrally stiffened panel were simulated, which includes central90°symmetric crack, center45°symmetry crack etc.. The influence of different types and different parameters of stiffened panels on crack propagation were also studied. Finally, the crack propagation of central90°and45°symmetric crack were researched by experiment, then the experimental results were compared with simulation results and the reliability of the simulation program was verified.The research methods and conclusions of this paper provide a new approach for the analysis of fatigue fracture in integrally stiffened panel.