Influence of Countersunk Bolt Geometry Error on the Bearing Performance of Composite joint Structure
As an important joint form in modern aircraft composite structures,countersunk bolts have a direct impact on the service performance of the structure due to their dimple accuracy and assembly quality.Countersunk bolts are widely used in aircraft composite joint structures due to their ability to ensure surface flatness of the joint structure.Due to process and structural limitations,dimple angle and depth errors are usually unavoidable and have an impact on the mechanical properties and load-bearing capacity of the jointing structures.In response to the above issues,this paper conducted a study on the impact of geometric errors in countersunk bolt dimpling on the load-bearing mechanism and strength of composite joints.Based on the definition of angle error,deflection direction error and depth error,loading experiments were conducted under different errors and microscopic analysis was conducted.By analyzing the loading curves and interface morphology,the structural damage mechanism and joint failure load under different errors were revealed,and the influence of dimple geometry error on the mechanical behavior of composite countersunk bolt single lap joint was explored,which provided theoretical basis for the efficient engineering application of countersunk bolts in composite joint structures.
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