Inter-laminar stress analysis of laminated composite fan blade dovetail

The finite element simulation technique was used to study the inter-laminar stress characteristics of dovetail under tensile and tension and bending coupling conditions. Based on the FiberSIM-ACP interaction module, the finite element modeling and inter-laminar stress analysis process of the fan blade dovetail were established. A finite element model of the fan blade dovetail satisfying the requirements of inter-laminar stress analysis accuracy was determined. The effectiveness of the finite element model was verified by comparison with the experimental results. Results showed that the high stress area of S33 under the tensile condition was located at the variable thickness position of the dovetail, 14 layers near the pressure surface were subjected to tensile stress; the high stress zones of S13 and S23 were in the same region, the shear stress was closely related to the ply angle, the 0° ply was subjected to a large shear stress S13, the ±45° ply was simultaneously subjected to large shear stresses S13 and S23.The high stress area of the S33 between the layers was extended to the upper end of the dovetail after adding the bending load, and the number of layers subjected to tensile stress increased; the high stress area of the shear stress was close to the bearing surface of the dovetail, and the number of layers in the high stress area also increased.