Design and Interlaminar Stress Analysis of Composite Fan Blade Shank

The fan blade shank serves as a critical transition structure connecting the airfoil and dovetail, with its geometric design significantly influencing the blade's structural integrity. This study investigates the geometric configuration and static strength of the laminated composite fan blade shank, with emphasis on design methodology and analytical approaches. Utilizing Bézier spline curve techniques, two shank configurations-thickened and thinned-were developed for the laminated composite fan blade shank, followed by ply design and static strength analysis. The results demonstrate that high-stress regions in the laminated composite fan blade are predominantly located at the junction between the shank section and the leading edge of the dovetail. Furthermore, the thickened shank configuration effectively reduces the peak σ₃₃ by approximately 15% and simultaneously alleviates the interlaminar shear stress σ₁₃, without introducing adverse ply drop angles, which exhibits superior interlaminar stress resistance under tensile loading conditions.