Abstract
During the service process of bolted composite structures, the local bolt pre-tightening force may decrease, that is, the bolts are inconsistently pre-tightening, which will affect the integrity of the whole system. Here, a semi-analytical modeling method for bolted composite plates with inconsistent pre-tightening conditions is studied. To simulate the uneven pressure distribution on the bolted joint surface, a variable stiffness spring surface model is proposed and a method to obtain the parameters of the model is also described. For a specific connection structure, each joint is simplified into a spring surface model and modeling of inconsistent bolt preload in the connection structure could be realized by assigning different parameters to each spring surface model. Based on the classical laminate plate theory, the strain and kinetic energy of the composite plate are calculated and the motion equation of the structures is deduced by the Rayleigh-Ritz method. Finally, a modal test is applied for a multi-bolted fiber-reinforced composite plate. The accuracy of the model is verified by both test and 3D finite element analysis results. The influence of loosening degree, position and quantity of loosening bolts on natural frequencies of bolted composite plates is further analyzed.
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