Patent ID: 6230537
Filing Date: 2001-05-15
Classification: B21C,B21D,B21J,B23P,B24B,C21D,Y10T

Abstract:
Tooling for working a structure to improve the fatigue strength at a selected location in said structure, said structure comprising a first surface, a second surface, and a body therebetween, said tooling comprising:a first indenter, said first indenter comprising a contacting end for engagement with and deformation of a pre-selected portion of said first surface of said structure to impart a residual stress profile in said body of said structure,and wherein said contacting end of said first indenter comprises a shaped surface profile substantially conforming to a dimple shave in said first surface of said structure produced by the application of a substantially uniform pressure profile on said pre-selected portion of said first surface of said structure,and wherein said contacting end of said first indenter further comprises a surface shape defined by the equation: ##EQU4##whereinp.sub.z =normal displacement of a selected surface location of said contacting end of said indenter above a flat reference plane,v=Poisson's Ratio of the material comprising said workpiece;E=Elastic Modulus of the material comprising said workpiece;P.sub.m =a pre-selected uniform pressure greater than the yield stress of the material comprising said workpiece;a=radius of the contacting end of said indenter; and.theta., r=polar coordinates of a selected surface location on said contacting end of said indenter.