Measuring and testing – Ductility or brittleness
Patent
1977-02-09
1978-08-15
Ruehl, Charles A.
Measuring and testing
Ductility or brittleness
73141R, 361283, F16B 3102
Patent
active
041063708
ABSTRACT:
A device for the sensing and the measuring of the axial tension stresses occurring within the bolt of a threaded fastening system under installation comprising a metallic, electrically conductive flat washer-like first member, and a metallic, electrically insulated flat washer-like second member; wherein the electrically insulating material of an anodic-oxide coating, which is grown onto the second member's electrically conductive aluminum base material, is used as an intervening solid supporting substance for the purpose of spacing the first and the second member's electrically conductive surfaces, through a predetermined distance from each other, to resist a current flow therethrough; wherein, due to the anodic-oxide coating's minute compressibility under varying light to severe compressive load conditions, a change in the oxide coating's electrical leak-resistance occurs, thus allowing a very minute, detectable current to flow between the first and the second member. The minute electric current is electronically detected, measured and displayed.
REFERENCES:
patent: 3260904 (1966-07-01), Booe
patent: 3307407 (1967-03-01), Berg et al.
patent: 3943417 (1976-03-01), Patti
patent: 3945704 (1976-03-01), Kraus et al.
Kraus Edmund Joseph
Kraus Robert August
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