Patent ID: 7931443

Claim:
A turbomachine blade comprising: an airfoil portion formed between a blade leading edge and a blade trailing edge, and a pressure side wall and a suction side wall extending between the leading edge and the trailing edge and forming a concave surface on the pressure side and a convex surface on the suction side; a slot formed within the blade and between the pressure side wall and the suction side wall, the slot extending substantially from the leading edge region to the trailing edge region of the blade, and the slot extending from a blade tip region to a platform region; the slot being of such thinness that shear stress from one wall to the opposite wall of the airfoil does not transfer in order for the blade twist to increase; a thin sheet located in the slot and between the adjacent airfoil walls to allow sliding between the airfoil walls and produce a damping effect on the blade during rotation; and, the slot is thin enough such that the adjacent airfoil walls rub during blade rotation and provide damping for the blade.