Process of compression stressing metals to increase the fatigue

Details Process of compression stressing metals to increase the fatigue Process of compression stressing metals to increase the fatigue

1975-08-25

1977-07-12

Lanham, C.W.

Metal deforming

By shot-blasting

72362, 72365, C21D 706, B21B 100

Patent

active

040345858

ABSTRACT:
A process of compression stressing metals to increase the fatigue strength or resistance to brittle fractures thereof by shot peening or surface rolling wherein the elastic radial tensile stress of the metal is maintained at a safe low value at the time when subsurface yield incident to initial compression stressing occurs. Initial processing entails compression stressing of the metal under conditions imparting compression stresses of sufficiently low value to avoid the formation of superficial or surface cracks in notch-sensitive metals followed, where required, by final processing wherein the metal is subjected to compression stressing under conditions imparting compression stresses of sufficiently high value to produce a favorable distribution of residual compression stress and residual tensile stress for increase of the fatigue strength of the metal.

REFERENCES:
patent: 2077639 (1937-04-01), Minich
patent: 3073022 (1963-01-01), Bush
patent: 3573023 (1971-03-01), Thomas
patent: 3701677 (1972-10-01), Miyata

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