Three-dimensional bearing stress distribution at bolt-hole in quasi-isotropic laminates

Hole edge stress is an important basis for strength check in composite joints design, and bolt-hole clearance has obvious influence on it. For the single-lap joint structure of quasi isotropic laminated plates, the elastic foundation shear beam model was adopted and the analytical solution of the shank deflection was derived. The distribution of the bearing load along the thickness direction of the laminates was given. On this basis, the Persson model of the bearing stress distribution at the hole edge was extended to the three-dimensional case, the stress distribution and the stress concentration factor at the hole edge were obtained. The theoretical results were verified by the three-dimensional detailed finite element method. Finally, the influence of the clearance, laminates thickness and external load on stress concentration factor was analyzed by theoretical method.