日本金属学会誌

J. Japan Inst. Metals, Vol. 6, No. 12 (1942),
pp. 617-621

Studies on the Fatigue by Multiple Loading (1 st Report)

Tadao Sato1

1海軍航空技術廠材料部

Abstract:

Fatigue properties of super duralumin plate (SDH) subjected to two different values of cyclic stress were investigated. The results obtained are summarised as follows:
(1) When the value of cyclic stress to be applied primarily is below the static yield point, the following relation has been found:
_??_
where Ni is the number of cycles of a stress applied alone at which the specimen shall be failed, and Ni' is the number of cycles of the same stress to be applied as a primary stress, or as a secondary one at which the specimen shall be failed. If the value of a primary cyclic stress is greater than of the subsequent cyclic stress, and the number of cycles of the former is relatively larger, the relation mentioned above becomes as follows:
_??_
(2) When the value of a primary cyclic stress is nearly the static yield point, the relation (1) changes as follows:
_??_
(3) When the value of a primary cyclic stress is about the altimete tensile strength, the relation has been obtained as follows:
_??_


(Received 1942/07/14)

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