新しい回転曲げ疲労試験機について

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In fatigue test strain usually arises a little later than stress applied to the specimen. Owing to this strain lag, in rotating bending fatigue test, the specimen is bent in the direction otherwise than what it was at the moment stress was applied. However, since the conventional rotating bending fatigue testing machine of uniform moment type loads up the specimen through only the knife edges, the specimen can be bent only in the direction at the moment stress was applied and not at right-angle to it; therefore the specimen is given an unknown restrictive load and the test will be futile. On the other hand, the new rotating bending fatigue testing machine of uniform moment type described in this paper loads up the specimen through the knife edges and a pair of pivots, and the sustaining frames of the rotating axis which keeps the specimen supported with a pair of angular contact radial ball bearings. So the specimen can be bent in any direction and therefore no unknown restrictive load is applied to it, and consequently our test will not be futile. Fatigue strengh of S55C steel specimens gas been tested by the new testing machine and compared with the results obtained by the conventional testing machine. It has been found that the fatigue limit obtained by the former machine, equal to the one by the latter, but the fatigue strength at N cycles obtained by the former machine is smaller than the one by the latter. The difference between these fatigue strength values at N cycle is considered to be due to the unknown restrictive load mentioned above and this difference is to increase with the applied stress.
社団法人日本材料学会の論文
1966-01-15

新しい回転曲げ疲労試験機について

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