Frequency tuned turbomachine blade

摘要

A fan blade (10) includes a metal airfoil (14) having first and second opposite sides (16,18) extending radially between a root (20) and tip (22), and axially between a leading edge (24) and a trailing edge (26). The airfoil further includes a plurality of pockets (36) disposed in the first side and separated by corresponding ribs (38). A filler (40) is bonded in the pocket, and is coextensive with the airfoil first side. Radial and diagonal ribs (38a-c) respectively intersect solely each other for selectively increasing torsional and bending stiffness to increase frequency margin between adjacent torsional and bending resonant modes of vibration.