切欠引張強さ比の応力三軸度およびひずみ硬化指数依存性

概要

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Dependence of notch strength ratio on stress triaxiality and strain hardening exponent was investigated for a variety of structural steels. Both the notched specimens with different notch root radii and the unnotched specimens were employed to obtain a wide range of stress triaxiality. All specimens were loaded up to break under tensile loading at room temperature. Notch strength ratio was defined by a ratio of notch tensile strength to tensile strength of the material. The notch tensile strength required to break the notched specimen depends on the stress-state characterized by stress triaxiality. Notch strength ratio increased with increasing stress triaxiality, which eventually reached the limiting value in the range of high stress triaxiality. The limiting notch strength ratio showed a clear dependence on the strain hardening exponent, and could be used conveniently to estimate the upper limit load to break the mechanical component in failure analysis.
2009-01-25