アルミニウム合金の疲労強度に及ぼす重畳高調波応力の影響

概要

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This is the report of the study that was made of the behavior of fatigue strength of aluminum alloy 7075-T6 under a composite stress consisting of rotating bending stress and superimposed stress of higher frequency. The rotating bending stress is denoted by primary stress σ_1 and the super imposed stress, by secondary stress σ_2. The frequency ratio of the secondary stress to the primary stress is selected to about 12. Main conclusion are as follows. It was observed that the fatigue strength only depended on the frequency ratio of the primary and secondary stresses, but independent of the values of respective frequencies. The effect of the magnitude of secondary stress on the fatigue life was more or less depending on the magnitude of maximum stress σ_<max>(=σ_1+σ_2). Let the σ_<max> be higher than 1.5 σ_w (σ_w; endurance limit), the fatigue life was observed to fall when σ_2/σ_<max> was less than 0.4. On the other hand, let the σ_<max> be lower than 1.5σ_w, the fall rate of the fatigue life was slight inn proportion to the decrease of maximum stress. In conclusion a convenient method of estimating the fatigue strength under composite stress is proposed.
社団法人日本材料学会の論文
1968-02-15