Method of determining fatigue and stress corrosion damage

Details Method of determining fatigue and stress corrosion damage Method of determining fatigue and stress corrosion damage

1980-03-28

1981-09-01

Smith, Alfred E.

Radiant energy

Coded record and readers; invisible radiant energy type

250272, G01N 2320

Patent

active

042874165

ABSTRACT:
A method of determining the amount of fatigue or stress-corrosion damage occurring in a member includes the step of matching the target material of the x-ray tube with the material of the member such that x-rays from such target material are capable of penetrating beyond the work hardened surface layer of the member. Since the work hardened surface layer extends up to a depth of from about 100 to 200 micrometers in most metallic materials, the x-ray radiation should at least penetrate to a depth of from about 200 to about 400 micrometers to provide x-ray diffraction line intensity profiles from which the excess dislocation density for the material can be determined. The ratio of the average excess dislocation density of the member to the critical excess dislocation density at failure is equivalent to the fatigue or stress-corrosion damage that has occurred to the member.

REFERENCES:
patent: 2079900 (1937-05-01), Cohn
patent: 2462374 (1949-02-01), Firth
patent: 4095103 (1978-06-01), Cohen et al.
Biedermann et al., "Rapid Determination of Dislocation Densities in Cryst", IBM Tech. Disclosure Bull., vol. 14, No. 1, Jun. 1971.
Cullity, B. D., Elements of X-ray Diffraction, pp. 292-295, Addison-Wesley Pub. Co., Oct. 1978.

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