工業用純チタンにおける切欠部から発生した微小き裂の伝ぱ挙動

概要

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The initial propagation behavior of small fatigue cracks initiated at a sharp notch as well as at the tip of a pre-crack has been investigated under constant push-pull loading with the stress ratio R -0 in sheet specimens of a commercially pure titanium. Growth rates of small fatigue craks (<0. 4 mm) varied over a wide range under the influence of the microstructure. In the case of a notched specimen, steady growth of a fatigue crack was preceded by initiation, early growth and joining of multiple cracks near the notch root. In the case of a pre-cracked specimen, steady growth was preceded by early growth of the pre-crack, initial craking at different sites remote from the growing crack, and their joints. Fractographic observation supports the above explanation of the behavior.
一般社団法人日本機械学会の論文
1994-02-25