アルミニウム合金の二段変動荷重下におけるき裂進展速度の遷移現象について

概要

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Fatigue crack growth behavior under varying amplitude load conditions can not be estimated presisely from the fatigue crack growth data under constant load conditions,even when discussed from the view point of the effective stress intensity factor,because it depends upon other factors such as crack tip blunting. Hitherto,crak growth under repeated block load (i.e.two-step) conditions has been ordinarily discussed microscopically,and on the other hand,those after single and multiple peak overloads have been discussed macroscopically.It is preferable to relate the above two approaching methods with each other in order to evaluate the crack growth behavior under varying load conditions systematically.In order to clarify the transient phenomena of fatigue crack growth behaviors under two-atep varyihg load conditions,a series of fatigue crack growh tests were carried out on aluminum alloy (2017-T3)CT specimens.An analytical crack growth law during the transient period was established through the empirical simulation between crack growth length and stress cycles in this period.The procedure presented in this study isuseful to predict fatigue crack growth under other types of varying load conditions.
社団法人日本材料学会の論文
1990-07-15