Effects of Geometrical Variation on Bolt Load and Stress Distributions in Multi-Bolt Composite Joints
In this paper,a semi-analytical model of the double-lap structure of composite laminates considering joint clearance is established to study the influence of geometric variations on the distributions of bolt load and stress field.Firstly,a representative bolt/hole unit is extracted from the typical composite joints,and a local stiffness model of the bolt/hole unit considering random geometrical variation and contact state is established.Secondly,based on Reddy's high order shear deforamtion plate theory,the finite element model of composite laminates is established to extract global structural stiffness matrix.Finally,by combining the local stiffness model of the bolt/hole unit with the global stiffness model of laminates,an assembly mechanical analysis model of multi-bolt composite joints is established that takes into account bolt/hole clearance and hole tensile deformation.The validity and accuracy of the model are verified by comparing it with 3D finite element simulation results.Numerical simulation results with random clearances show that a certain bolt clearance can lead to a more even bolt load distribution,providing theoretical guidance for the hole arrangement design of multi-bolt joints.
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