Fatigue indicator

Details Fatigue indicator Fatigue indicator

1984-11-01

1986-04-08

Frankfort, Charles

Signals and indicators

Indicators

Stress type

73762, 73787, G01N 1908

Patent

active

045805202

ABSTRACT:
The invention relates to a fatigue indicator for mechanical parts subjected to repeated stresses, which comprises two thick elements spaced apart from one another and joined together by a thin web having a slit, these two elements being incorporated in the part or fixed thereto so as to move with respect to one another upon application of stress on the mechanical part in a plane which is parallel to the plane of the web, the thin web being thus subjected to a shearing stress in its plane, and wherein the slit of the thin web extends from one of the edges of the web in the direction of relative movement to a blind end so that, when the part is stressed, two cracks appear from corners of the blind end of the slit, extend progressively in the web and finish by reaching the opposite edge of the web or joining cracks coming from this opposite edge, the web thus being detached or practically detached.

REFERENCES:
patent: 3572091 (1971-03-01), McFarland
patent: 4409841 (1983-10-01), Archer
patent: 4502337 (1985-03-01), Archer

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