切欠き板試験片の繰返しひずみ挙動の研究(8) : 面内曲げ疲労

概要

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From the cyclic strains measured by strain gages during the fatigue test of notched specimens under the control of bending deflection of in-plane bending, two types of cyclic strain behaviors near notch roots have been found : in one type named as IS, the strain near notches increases with an increasing cycles, and in other type named as CS, the strain near notches remains constant with an increasing cycles. In case of IS, it has been found that thin surface layers of both notch roots extend toward the tension strain with an increase of the number of cycles and Manson-Coffin rule may be applied to the relationships between the saturated strain range at a notch root and the number of cycles to a fatigue crack length of 1mm. The mechanism of IS behavior have been explained in detail from the experimental result of a specimen using many strain gages.
長崎大学の論文