Patent ID: 8794925
Filing Date: 2014-08-05
Classification: F01D,F05D,Y02T

Abstract:
1. A root region of an airfoil comprising: an inner ply layer group that extends from an innermost root region at least partially into an intermediate platform region, said inner ply layer group includes an outermost ply, said intermediate platform region includes a platform that has an upper surface from which an airfoil region extends and an opposed lower surface from which the innermost root region extends; and an attachment ply layer group attached to said outermost ply, wherein said attachment ply layer group includes a contact surface from an end-point location (A) to an end-point location (B) in contact with a disk, with a first line extending perpendicularly from a mid-point location (C) of said contact surface between said end-point location (A) and said end-point location (B) and a second line extending at an angle of 45° to said first line and intersecting said mid-point location (C), said second line intersecting said outermost ply of said inner ply layer group at a location (D), with a third line intersecting location (D) and extending perpendicular to a centerline of said innermost root region, and an initial transition of said outermost ply of said inner ply layer group away from said centerline is radially inboard of said location (D).