Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1996-12-18
1998-11-24
Noori, Max H.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73760, 72362, 148225, G01N 1908
Patent
active
058410333
ABSTRACT:
A process for improving fatigue resistance of a case hardened component having a case thickness "t", subjected to one or more of rolling, sliding, abrasion, bending and pitting includes determining the magnitude of fatigue strength at surface and at a plurality of pre-selected points along thickness "t" of a component. The applied fatigue stresses acting upon the component at the surface and at the plurality of pre-selected points along thickness "t" are also determined. Then, a compressive residual stress profile is tailored from the surface to thickness "t" of the component. The compressive residual stresses at the surface and at the plurality of the pre-selected points along thickness "t" respectively have a magnitude sufficient to attain a net resultant stress which is at least 25% lower than the fatigue strength at the surface and the corresponding plurality of pre-selected points.
REFERENCES:
patent: 3652346 (1972-03-01), Tomita et al.
patent: 4034585 (1977-07-01), Straub
patent: 4191599 (1980-03-01), Stickets et al.
patent: 5079955 (1992-01-01), Eberhardt
Burris Kenneth W.
Clements Thomas E.
Caterpillar Inc.
Kercher Kevin M.
Khosla Pankaj M.
Noori Max H.
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