繰返しひずみ感度計

概要

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The author proposes in this paper a new device directly analysing the strength of constructions submitted to dynamic loads in service. This is a sort of qualitative dynamic strain counter which permits us, the author expects, to make ovar-all evaluation of these constructions from the point of view of fatigue strength. The essential features of this device are as follows : i) the materials, which are sensitive to repeating strain, should be ductile metals ; for example copper, ii) these metals should have a fine wire or ribbon shape and be attached to the surface of construction members with some kind of resin adhesive just as in the case of wire strain gauge, iii) the variation in some characteristic qualities of the detecting metal should be easily distinguishable and so definitely regular that we could determine the equivalent strain amplitude and cycles of the examined construction with the indication of this device. As one example of such device the author has described here his first attempt utilizing a notched fine wire and some of his characteristics revealing the feasibility of the proposed device. Purposes of several reports in U.S.A. and England are a little different from mine. The latter is never any fatigue detector but a load counter of fatigue testing machine (i.e. in service condition) utilizing the actual construction in service as test piece.
社団法人日本材料学会の論文
1958-10-15