Effects of Stress Wave Form and Superposition of Vibratory Stresses on Cyclic SCC Crack Growth Behavior in an Al-Alloy

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Influences of stress wave forms and superposition of vibratory stresses at the periods of the maximum stress under a low-frequency varying load on cyclic SCC have been investigated with a high-strength aluminum alloy, and the loading condition dominating over cyclic SCC and the competition between cyclic and dynamic SCC have been discussed. The threshold stress intensity factor for cyclic SCC, K_<max> = K_<FSCC>, is independent of hold time at the maximum stress, but increases with a decrease in varying load rates per time K^^・. At higher ΔK_%lt;eff%gt;, however, da/dN is enhanced with a decrease in ΔK^^・_%lt;eff%gt; i.e., at longer rise time; this is similar to those of conventional corrosion fatigue. On the other hand, the superposition of vibratory stresses promotes corrosion products-induced wedge effects with K_<op> =K_<max>. In this case, K_<FSCC> is determined by the threshold stress intensity factor, K_<DSCC>, for dynamic SCC under the secondary vibratory stress condition.
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