2014アルミニウム合金の疲労き裂進展と波面解析による研究

概要

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The fatigue crack propagation was investigated macroscopically on aluminum alloy 2014 treated at three different heating conditions. The fatigue fracture surface at a notch front was observed with an electronmicroscope and the appearance of shear zone and crack initiation in the notched specimen was discussed fractographically. The fatigue limits of T4 and T6 specimens with solution treatment were higher than that of O specimen without such treatment. All the materials followed the Paris' formula, but a parameter representing the easiness of crack initiation from a notch, which corresponds to the threshold stress intensity factor, was found to increase by the treatment. It was observed by electoronmicroscopy that facets and smooth patterns appeared at the 1st stage of crack propagation on the fatigue fracture surface of T4 and T6 specimens, and a river pattern showing cleavage fracture and striations characteristic of fatigue fracture surface appeared at the 2nd stage of crack propagation.
社団法人日本材料学会の論文
1975-02-15