切欠引張強さ比と限界ひずみ比の関係

概要

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Relationship between the notch strength ratio, defined as the notch tensile srtength to tensile strength ratio, and the critical strain ratio was investigated on the notched tensile specimens. Critical strain ratio is the ratio of critical strain below the notch tip at the notch tensile strength to the plastic strain at necking instability, which is equal to strain hardening exponent. Critical strain was obtained from measurements of Vickers hardness. Notch strength ratio increased simply with increasing critical strain ratio for the notched specimens with different notch acuity. Thus, the critical strain ratio could be considered to be a major parameter which characterizes the notch strength ratio as well as the stress increase rate of notched specimens in the force-elongation response.
2010-05-25