Keywords
mechanical fasteners
load-bearing capacity
fatigue life
assembly parameters
How to Cite
Abstract
Carbon fibre reinforced polymer (CFRP) composites have become one of the main structural material used in aircraft airframes in recent years due to a number of advantages. In the aerospace industry, where safety is crucial, mechanical fasteners are used to join structures with high strength requirements. Our own research has shown that the pressure generated during bolt assembly has a positive effect on the strength of the composite material itself. At the same time, experimental tests have shown that fatigue life increases with increasing pressures. The results of numerical simulations showed that as the bolt assembly torque increases, the stresses in the CFRP material in the vicinity of the assembly holes decrease. In addition, it was found that the application of a low-viscosity adhesive between the threaded shank of the bolt and the surface of the hole during bolt assembly not only protects the layered composite material from damage caused by the thread peaks, but also has a positive effect on the load-bearing capacity and fatigue life of the joints, which, according to the results of numerical simulations, is related to a significant change in the stress field in the assembly hole.
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